<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0718-4816</journal-id>
<journal-title><![CDATA[Revista de otorrinolaringología y cirugía de cabeza y cuello]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Otorrinolaringol. Cir. Cabeza Cuello]]></abbrev-journal-title>
<issn>0718-4816</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Chilena de Otorrinolaringología, Medicina y Cirugía de Cabeza y Cuello]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0718-48162012000100011</article-id>
<article-id pub-id-type="doi">10.4067/S0718-48162012000100011</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Linfoma MALT de parótida, presentación de un caso clínico y revisión del tema]]></article-title>
<article-title xml:lang="en"><![CDATA[Parotid MALT lymphoma, presentation of a clinical case and review of subject]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández A]]></surname>
<given-names><![CDATA[Francisca]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espinoza N]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mercado M]]></surname>
<given-names><![CDATA[Víctor]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vallejos A]]></surname>
<given-names><![CDATA[Humberto]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Valparaíso Facultad de Medicina ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Clínica Reñaca  ]]></institution>
<addr-line><![CDATA[Viña del Mar ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Hospital Carlos Van Buren  ]]></institution>
<addr-line><![CDATA[Valparaíso ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2012</year>
</pub-date>
<volume>72</volume>
<numero>1</numero>
<fpage>79</fpage>
<lpage>86</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.cl/scielo.php?script=sci_arttext&amp;pid=S0718-48162012000100011&amp;lng=en&amp;nrm=iso&amp;tlng=en"></self-uri><self-uri xlink:href="http://www.scielo.cl/scielo.php?script=sci_abstract&amp;pid=S0718-48162012000100011&amp;lng=en&amp;nrm=iso&amp;tlng=en"></self-uri><self-uri xlink:href="http://www.scielo.cl/scielo.php?script=sci_pdf&amp;pid=S0718-48162012000100011&amp;lng=en&amp;nrm=iso&amp;tlng=en"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los linfomas de las glándulas salivales son una entidad poco frecuente, estimándose una incidencia del 5%. La localización más habitual es la glándula parótida, seguida de la submaxilary la sublingual. La mayoría de los linfomas parotídeos son linfomas no Hodgkin (LNH) y se consideran derivados del tejido linfoide asociado a mucosas (MALT). Infrecuentemente se han reportado estos casos y suelen ser subdiagnosticados por su presentación relativamente benigna, comportándose de forma localizada, de lento crecimiento, con varios años de evolución. Presentamos un caso clínico de linfoma tipo MALT de parótida de acuerdo a las características clínicas, histológicas e inmunohistoquímicas de este tumor. Además una revisión de la literatura de este caso.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Lymphomas of the salivary glands are a rare entity, with an estimated incidence of 5%. The most frequent location is parotid gland, followed by the submandibular and sublingual. The majority of parotid lymphomas are non-Hodgkin's lymphoma NHL and are considered derived from mucosa-associated lymphoid tissue (MALT). Infrequently these cases have been reported and are often underdiagnosed for their presentation is relatively benign, localized behaving, slow growing, with several years of evolution. We report a case of parotid MALT lymphoma according to the clinical, histological and immunohistochemical characteristics of this tumor. In addition, a literature review of this case.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Linfoma tipo MALT]]></kwd>
<kwd lng="es"><![CDATA[tumor de glándula parótida]]></kwd>
<kwd lng="en"><![CDATA[Type MALT lymphoma]]></kwd>
<kwd lng="en"><![CDATA[parotid gland tumor]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p><font face="verdana" size="2">Rev. Otorrinolaringol. Cir. Cabeza Cuello 2012; 72: 79&#45;86</font></p>  	    <p align="right"><font face="verdana" size="2"><strong>CASOS CL&Iacute;NICOS</strong></font></p> 	    <p>&nbsp;</p>     <p><font face="verdana" size="4"><b>Linfoma MALT de par&oacute;tida, presentaci&oacute;n de un caso cl&iacute;nico y revisi&oacute;n del tema</b></font></p>  	    <p><font face="verdana" size="3"><b>Parotid MALT lymphoma, presentation of a clinical case and review of subject</b></font></p> 	    <p>&nbsp;</p> 	    <p><font face="verdana" size="2"><b>Francisca Fern&aacute;ndez A<sup>1</sup>, Carlos Espinoza N<sup>1</sup>, V&iacute;ctor Mercado M<sup>2</sup>, Humberto Vallejos A<sup>3</sup>.</b></font></p> 	    <p><font face="verdana" size="2"><sup>1</sup>&nbsp;Interno de Medicina, Facultad de Medicina, Universidad de Valpara&iacute;so.</font>    <br>       <font face="verdana" size="2"><sup>2</sup>&nbsp;M&eacute;dico Otorrinolaring&oacute;logo, Cl&iacute;nica Re&ntilde;aca, Vi&ntilde;a del Mar.</font>    ]]></body>
<body><![CDATA[<br>       <font face="verdana" size="2"><sup>3</sup>&nbsp;M&eacute;dico Anatomopat&oacute;logo, Hospital Carlos Van Buren, Valpara&iacute;so.</font></p> 	    <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><A id="top" name="top"></A><A href="#back">Direcci&oacute;n   para correspondencia</A></font></p> 	<hr size="1" noshade> 	    <p><font face="verdana" size="2"><b>RESUMEN</b></font></p>     <p><font face="verdana" size="2"><i>Los linfomas de las gl&aacute;ndulas salivales son una entidad poco frecuente, estim&aacute;ndose una incidencia del 5%. La localizaci&oacute;n m&aacute;s habitual es la gl&aacute;ndula par&oacute;tida, seguida de la submaxilary la sublingual. La mayor&iacute;a de los linfomas parot&iacute;deos son linfomas no Hodgkin (LNH) y se consideran derivados del tejido linfoide asociado a mucosas (MALT). Infrecuentemente se han reportado estos casos y suelen ser subdiagnosticados por su presentaci&oacute;n relativamente benigna, comport&aacute;ndose de forma localizada, de lento crecimiento, con varios a&ntilde;os de evoluci&oacute;n. Presentamos un caso cl&iacute;nico de linfoma tipo MALT de par&oacute;tida de acuerdo a las caracter&iacute;sticas cl&iacute;nicas, histol&oacute;gicas e inmunohistoqu&iacute;micas de este tumor. Adem&aacute;s una revisi&oacute;n de la literatura de este caso.</i></font></p>  	    <p><font face="verdana" size="2"><b><i>Palabras clave:</i></b> <i>Linfoma tipo MALT, tumor de gl&aacute;ndula par&oacute;tida.</i></font></p> 	<hr size="1" noshade> 	    <p><font face="verdana" size="2"><b>ABSTRACT</b></font></p>     <p><font face="verdana" size="2"><i>Lymphomas of the salivary glands are a rare entity, with an estimated incidence of 5%. The most frequent location is parotid gland, followed by the submandibular and sublingual. The majority of parotid lymphomas are non&#45;Hodgkin's lymphoma NHL and are considered derived from mucosa&#45;associated lymphoid tissue (MALT). Infrequently these cases have been reported and are often underdiagnosed for their presentation is relatively benign, localized behaving, slow growing, with several years of evolution. We report a case of parotid MALT lymphoma according to the clinical, histological and immunohistochemical characteristics of this tumor. In addition, a literature review of this case.</i></font></p>  	    <p><font face="verdana" size="2"><b><i>Key words:</i></b> <i>Type MALT lymphoma, parotid gland tumor.</i></font></p> 	<hr size="1" noshade> 	    <p>&nbsp;</p>     <p><font face="verdana" size="3"><b>INTRODUCCI&Oacute;N</b></font></p>      ]]></body>
<body><![CDATA[<p><font face="verdana" size="2">Los linfomas constituyen un grupo heterog&eacute;neo de enfermedades malignas, caracterizadas por la proliferaci&oacute;n neopl&aacute;sica de la porci&oacute;n linforreticular del sistema reticuloendotelial. Se dividen en dos grandes grupos: linfomas de Hodgkin (LH) y linfomas no Hodgkin (LNH). En estos &uacute;ltimos se estima que 10% a 40% se presentan como extranodales<sup>1</sup>. Dentro de los LNH se encuentran los linfomas derivados del tejido linfoide asociado a mucosas (MALT) o linfomas de c&eacute;lulas B monocitoides, como tambi&eacute;n se les conoce<sup>2&#45;4</sup>. Estos corresponden al 7,6% del total de LNH, siendo el tercer subtipo de LNH m&aacute;s frecuente, despu&eacute;s del linfoma difuso de c&eacute;lulas grandes y linfoma folicular<sup>5</sup>, y representan el tipo m&aacute;s com&uacute;n de linfomas extranodales primarios.</font></p>  	    <p><font face="verdana" size="2">Los linfoma tipo MALT fueron inicialmente definidos por Isaacson y Wright en 1983<sup>6</sup>, y designados posteriormente como una neoplasia de c&eacute;lulas B perif&eacute;ricas, en el grupo de linfomas de c&eacute;lulas B de la zona marginal, y de acuerdo a la m&aacute;s reciente clasificaci&oacute;n de la OMS, de tipo extranodal<sup>7&#45;9</sup>.</font></p>  	    <p><font face="verdana" size="2">La localizaci&oacute;n m&aacute;s frecuente de los linfomas tipo MALT corresponde al tracto gastrointestinal (60%&#45;70%), sin embargo, se describe una amplia variedad de sitios no gastrointestinales que incluyen: anexos del globo ocular, gl&aacute;ndulas salivales, tiroides, pulm&oacute;n, timo, mama, ri&ntilde;&oacute;n, h&iacute;gado y pr&oacute;stata<sup>4,9,10</sup>.</font></p>  	    <p><font face="verdana" size="2">De aquellos no gastrointestinales, los m&aacute;s frecuentemente encontrados pertenecen al &aacute;rea de cabeza y cuello con el 34% de los casos y dentro de &eacute;sta, la localizaci&oacute;n m&aacute;s frecuente es el anillo de Waldeyer, seguido de los senos paranasales y las gl&aacute;ndulas salivales<sup>11&#45;13</sup>.</font></p>  	    <p><font face="verdana" size="2">Los linfomas de las gl&aacute;ndulas salivales son una entidad poco frecuente, estim&aacute;ndose una incidencia del 5%. La localizaci&oacute;n m&aacute;s habitual es la gl&aacute;ndula par&oacute;tida con 75% de los casos, seguida de la submaxilar (23%) y la sublingual (1%)<sup>14&#45;17</sup>. La mayor&iacute;a de los linfomas parot&iacute;deos son LNH y se consideran tipo MALT<sup>16</sup>.</font></p>  	    <p><font face="verdana" size="2">Presentamos un caso cl&iacute;nico de linfoma tipo MALT de par&oacute;tida de acuerdo a las caracter&iacute;sticas cl&iacute;nicas, histol&oacute;gicas e inmunohistoqu&iacute;micas de este tumor.</font></p>  	    <p><font face="verdana" size="3"><b>CASO CL&Iacute;NICO</b></font></p>      <p><font face="verdana" size="2">Paciente de sexo masculino, 67 a&ntilde;os de edad, con antecedentes de hipertensi&oacute;n, litiasis renal y vesical. Consult&oacute; por aumento de volumen de regi&oacute;n par&oacute;tida izquierda, de crecimiento lento, de tres a&ntilde;os de evoluci&oacute;n. La inspecci&oacute;n demostr&oacute; un aumento de volumen difuso de la par&oacute;tida sin signos inflamatorios y la palpaci&oacute;n una masa de superficie lisa que ocupa la par&oacute;tida en toda su extensi&oacute;n. Se solicita punci&oacute;n con aguja fina (PAF) el a&ntilde;o 2008 y 2009, siendo ambas negativas para c&eacute;lulas neopl&aacute;sicas.</font></p>  	    <p><font face="verdana" size="2">La primera PAF informa: poblaci&oacute;n celular epitelial benigna compatible con origen en adenoma monom&oacute;rfico de gl&aacute;ndula par&oacute;tida y en 2009 se inform&oacute; como poblaci&oacute;n celular predominante de linfocitos peque&ntilde;os de aspecto benigno, con muy escasas c&eacute;lulas epiteliales atr&oacute;ficas, probablemente compatible con lesi&oacute;n linfoepitelial benigna. Adem&aacute;s se solicitan ex&aacute;menes de laboratorio y evaluaci&oacute;n reumatol&oacute;gica a fin de descartar enfermedades autoinmunes. El estudio de tomograf&iacute;a axial computarizada (TAC) informa: aumento de volumen difuso de gl&aacute;ndula par&oacute;tida izquierda, siendo su estructura interna homog&eacute;nea, sin lesiones focales s&oacute;lidas o qu&iacute;sticas, de baja intensidad se&ntilde;al en todas las secuencias realizadas. Con contraste endovenoso se observa moderado realce difuso, siendo significativamente mayor que lo observado en la gl&aacute;ndula contralateral. Ausencia de infiltraci&oacute;n a estructuras vecinas, cambios inflamatorios y adenopat&iacute;as. Impresiona corresponder a lesi&oacute;n benigna (<a href="#fig1">Figura 1</a>).</font></p> 	    <p align="center"><a name="fig1"></a>    ]]></body>
<body><![CDATA[<br> 	  <img src="/fbpe/img/orl/v72n1/fig11.1.gif" width="388" height="420">    
<br> 	</p>     <table width="42%" align="center">       <tr>         <td><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Figura 1. Aumento de volumen difuso de gl&aacute;ndula par&oacute;tida izquierda, de estructura interna homog&eacute;nea, sin lesiones focales    s&oacute;lidas o qu&iacute;sticas.</font></td>       </tr>     </table>     <p><font face="verdana" size="2">Con estos antecedentes se decide ex&eacute;resis quir&uacute;rgica, parotidectom&iacute;a total, la que se realiza en noviembre de 2010. El informe histopatol&oacute;gico del esp&eacute;cimen operatorio demostr&oacute;: gl&aacute;ndula salival, tejido adiposo y muscular estriado extensamente infiltrados por c&eacute;lulas linfoides de disposici&oacute;n intersticial y difusa, que separan e infiltran los acinos glandulares. C&eacute;lulas peque&ntilde;as con escaso citoplasma eosin&oacute;filo p&aacute;lido, n&uacute;cleo algo ovalado hipercrom&aacute;tico con nucl&eacute;olo peque&ntilde;o y escasa mitosis, compatible con LNH&#45; Tipo MALT de gl&aacute;ndula salival (<a href="#fig2">Figuras 2</a> y <a href="#fig3">3</a>).</font></p>     <p align="center"><a name="fig2"></a>    <br>   <img src="/fbpe/img/orl/v72n1/fig11.2.gif" width="392" height="354"></p>     
<p align="center"><a name="fig3"></a>    <br>   <img src="/fbpe/img/orl/v72n1/fig11.3.gif" width="384" height="374"></p>     
<p><font face="verdana" size="2">El estudio inmunohistoqu&iacute;mico confirma el diagn&oacute;stico, linfocitos B (CD 20) y Bcl 2: positividad</font> <font face="verdana" size="2">moderada y difusa en c&eacute;lulas tumorales. Linfocitos T (CD 3): negativo para c&eacute;lulas tumorales.</font></p>      <p><font face="verdana" size="2">Se completa etapificaci&oacute;n con TAC de cuello, t&oacute;rax, abdomen y pelvis, sin evidencia de otras localizaciones y la biopsia de medula &oacute;sea no demuestra compromiso medular.</font></p>  	    <p><font face="verdana" size="2">Dado el diagn&oacute;stico histopatol&oacute;gico se decidi&oacute; tratar con radioterapia a titulo exclusivo, completando 39,6 Gy en 22 fracciones sobre regi&oacute;n parot&iacute;dea izquierda incluyendo territorio ganglionar de grupos I, II, III, IV y V a izquierda. Se utiliz&oacute; fotones de 6 MeV con adecuada tolerancia. El TAC de cuello de control posradioterapia informa: ausencia de gl&aacute;ndula par&oacute;tida izquierda, observ&aacute;ndose zona de densidad aumentada, retr&aacute;ctil, de aspecto cicatricial en el lecho parotideo. No se observan sig</font><font face="verdana" size="2">nos de recidiva tumoral en el lecho parotideo ni en el resto del cuello (<a href="#fig4">Figura 4</a>). El examen cl&iacute;nico ORL de abril de 2011 muestra actividad del nervio facial normal y sin evidencia de recidiva local ni regional.</font></p> 	    ]]></body>
<body><![CDATA[<p align="center"><a name="fig4"></a>    <br> 	  <img src="/fbpe/img/orl/v72n1/fig11.4.gif" width="396" height="469">    
<br> 	</p>     <table width="42%" align="center">       <tr>         <td><font face="verdana" size="2">Figura 4. Ausencia de gl&aacute;ndula par&oacute;tida izquierda, con zona de densidad aumentada, retr&aacute;ctil, de aspecto cicatrizal en el lecho parotideo.</font></td>       </tr>     </table>     <p><font face="verdana" size="3"><b>DISCUSI&Oacute;N</b></font></p>      <p><font face="verdana" size="2">Los linfomas MALT se caracterizan por un bajo grado de malignidad, siendo posible el compromiso de nodos linf&aacute;ticos y de otros &oacute;rganos durante su evoluci&oacute;n. Comparten caracter&iacute;sticas cl&iacute;nicas, patol&oacute;gicas, inmunol&oacute;gicas y moleculares. Surgen a partir de una proliferaci&oacute;n linfoide prolongada, preexistente<sup>9</sup>, en tejido linfoide normalmente presente en sitio de origen o adquirido por infecci&oacute;n cr&oacute;nica o proceso autoinmune, pudiendo desarrollarse en casi cualquier &oacute;rgano.</font></p>  	    <p><font face="verdana" size="2">Se presentan principalmente en la sexta d&eacute;cada de vida, con leve predominancia en mujeres, frecuentemente asociados a procesos infecciosos y enfermedades autoinmunes<sup>18</sup>. Las caracter&iacute;sticas cl&iacute;nicas dependen del sitio de origen. La distinci&oacute;n entre linfomas marginales de las c&eacute;lulas B nodal y extranodal es cl&iacute;nicamente importante, ya que a pesar de la superposici&oacute;n de las caracter&iacute;sticas</font> <font face="verdana" size="2">morfol&oacute;gicas, su comportamiento cl&iacute;nico es distinto<sup>19</sup>. A diferencia de los linfomas marginales nodales, los extranodales tienen un curso menos agresivo, present&aacute;ndose como una masa difusa de lento crecimiento o engrosamiento submucoso que puede ser confundido con un proceso inflamatorio benigno o seudolinfoma<sup>20</sup>, manteni&eacute;ndose localizados por un largo periodo de tiempo, tal como se presenta en este caso cl&iacute;nico, en el que la lesi&oacute;n se comport&oacute; de forma localizada, con un lento crecimiento, de varios a&ntilde;os de evoluci&oacute;n. Especialmente los linfomas tipo MALT de gl&aacute;ndulas salivales muestran un curso muy desidioso, con tiempo de progresi&oacute;n entre 3 y 18 a&ntilde;os, incluso en ausencia de tratamiento. La historia y examen f&iacute;sico permite el diagn&oacute;stico en el 85%&#45;90% de los casos, present&aacute;ndose como una masa en la regi&oacute;n parotidea con las caracter&iacute;sticas ya descritas. Cuando la diseminaci&oacute;n ocurre, compromete principalmente otros sitios de mucosas.</font></p>      <p><font face="verdana" size="2">El rol diagn&oacute;stico de la imagenolog&iacute;a en linfomas de la gl&aacute;ndula par&oacute;tida es controversial<sup>21</sup>. Muchos autores promueven el uso del TAC<sup>22,23</sup>, otros sugieren la superioridad de la resonancia nuclear magn&eacute;tica<sup>24</sup> mientras que otros autores no usan ninguno de los dos<sup>21</sup>. Sin embargo, estudios demuestran que el uso de TAC, provee informaci&oacute;n impor</font><font face="verdana" size="2">tante del sitio y extensi&oacute;n del tumor, la relaci&oacute;n con el espacio parafar&iacute;ngeo y vasos carot&iacute;deos, adem&aacute;s de la presencia de m&uacute;ltiples lesiones subcl&iacute;nicas ipsilaterales y contralaterales, compromiso de tejidos blandos y estado ganglionar<sup>21,22,25,26</sup>. El diagn&oacute;stico por imagen es comparable con la citolog&iacute;a en discernir lesiones benignas de malignas<sup>25,27</sup>. No existen hallazgos patognom&oacute;nicos, sin embargo, tumores con m&aacute;rgenes pobres asociados a la cl&iacute;nica t&iacute;pica son los elementos m&aacute;s frecuentes a tener en consideraci&oacute;n.</font></p>      <p><font face="verdana" size="2">Se ha descrito una asociaci&oacute;n entre procesos infecciosos y autoinmunes en la patog&eacute;nesis de linfomas MALT. Respecto al rol de agentes infecciosos, existe una relaci&oacute;n firmemente establecida entre <i>Helicobacter</i> pyloriasociado al linfoma tipo MALT g&aacute;strico<sup>28&#45;30</sup>. En sitios no g&aacute;stricos, este rol se encuentra menos documentado, pero se describe un aumento en el n&uacute;mero de agentes pat&oacute;genos asociados, tales como <i>Chlamydia psittaci, Borrelia burgdorferi, Campylobacter jejuni</i>y virus de la inmunodeficiencia humana (VIH)<sup>31</sup>.</font></p>  	    <p><font face="verdana" size="2">En el caso de la gl&aacute;ndula par&oacute;tida, se ha asociado a virus de la hepatitis C, Epstein Barr<sup>31&#45;33</sup>, pero fundamentalmente se observa en gl&aacute;ndulas salivales afectadas de sialoadenitis mioepitelial (MESA)<sup>9,35&#45;37</sup>, frecuentemente asociado a s&iacute;ndrome de Sjogren, lo que pone en evidencia el rol de los procesos autoinmunes, tal como la tiroiditis de Hashimoto en tejido tiroideo.</font></p>  	    <p><font face="verdana" size="2">En este caso, la sospecha diagn&oacute;stica se bas&oacute; principalmente en la evoluci&oacute;n cl&iacute;nica, el estudio de imagen y la segunda citolog&iacute;a compatible con una lesi&oacute;n linfoepitelial benigna, sin evidencia de enfermedad autoinmune, hechos que llevaron a la decisi&oacute;n quir&uacute;rgica. Esto no es raro, puesto que se describe que este tipo de linfoma es de dif&iacute;cil diferenciaci&oacute;n en los tejidos linfoides y ganglios linf&aacute;ticos, a diferencia del tejido espl&eacute;nico y placas de Peyer, lo que hace necesario en la mayor&iacute;a de los casos la ex&eacute;resis parcial o total de la gl&aacute;ndula para su correcto diagn&oacute;stico.</font></p>  	    ]]></body>
<body><![CDATA[<p><font face="verdana" size="2">Las caracter&iacute;sticas histol&oacute;gicas de linfomas tipo MALT son similares independiente del sitio de origen. Se caracterizan por una heterogeneidad celular, con infiltrado de linfocitos de peque&ntilde;o y mediano tama&ntilde;o con abundante citoplasma y n&uacute;cleo de forma irregular <i>(centrocyte like cells),</i> adem&aacute;s de blastos transformados dispersos<sup>31</sup>.</font></p>  	    <p><font face="verdana" size="2">Una caracter&iacute;stica principal es la presencia de lesiones linfoepiteliales, con invasi&oacute;n y destrucci&oacute;n parcial de gl&aacute;ndulas y criptas de la mucosa por agregados de c&eacute;lulas tumorales<sup>31</sup>. Sin embargo, &eacute;sta puede encontrarse en linfomas distintos al MALT. La inmunohistoqu&iacute;mica y evaluaci&oacute;n molecular ha sido &uacute;til en diferenciar linfomas MALT de estas otras lesiones<sup>13,20</sup>.</font></p>  	    <p><font face="verdana" size="2">El inmunofenotipo caracter&iacute;stico es la expresi&oacute;n de ant&iacute;genos pan&#45;B (CD19, CD20, CD22, CD79a), pero carecen de la expresi&oacute;n de CD5, CD10, CD23 y Bcl&#45;1. En raras ocasiones, los linfomas MALT exponen aberraci&oacute;n de CD5, que puede estar asociada con un curso cl&iacute;nico m&aacute;s agresivo<sup>38</sup>.</font></p>  	    <p><font face="verdana" size="2">Los linfoma tipo MALT presentan a los menos tres translocaciones rec&iacute;procas: t(11;18)(q21;q21), t(1;14)(p22;q32), y t(14;18)(q32;q21). La translocaci&oacute;n t (11;18) (q21;q21) se encuentra en</font> <font face="verdana" size="2">el 18%&#45;53% de los casos<sup>39,40</sup>.</font></p>      <p><font face="verdana" size="2">Algunos linfomas MALT se transforman en linfomas difusos de c&eacute;lulas grandes B (LDCGB). La translocaci&oacute;n t (11;18)(q21;q21) raramente cursa con aberraciones clonales adicionales, siendo al parecer m&aacute;s estables gen&eacute;ticamente. En contraste, las translocaciones de linfomas MALT que no tienen esta translocaci&oacute;n se pueden transformar en LDCGB<sup>41,42</sup>.</font></p>  	    <p><font face="verdana" size="2">Respecto al tratamiento, var&iacute;a entre cirug&iacute;a, radioterapia y quimioterapia, siendo importante la localizaci&oacute;n del sitio primario para la elecci&oacute;n del tra&#45;tamiento<sup>43&#45;45</sup>.</font></p>  	    <p><font face="verdana" size="2">En el caso cl&iacute;nico presentado, el tratamiento concuerda con la literatura, en la que se describe que el principal tratamiento en estos linfomas es el uso de terapias locales, como cirug&iacute;a, radioterapia o ambos en hasta 78% de los casos, debido a sus caracter&iacute;sticas cl&iacute;nicas comentadas previamente. Sin embargo, se ha publicado que hasta 50% de pacientes con linfomas MALT extragastrointestinales puede presentar diseminaci&oacute;n en otros &oacute;rganos al momento del diagn&oacute;stico. Adem&aacute;s, estos linfomas presentan un mayor riesgo de recurrencia que los linfomas MALT g&aacute;stricos. Se ha descrito una tasa de recurrencia de hasta 30% en 5 a&ntilde;os, aumentando esta a medida que se tiene un mayor tiempo de seguimiento<sup>45,46</sup>.</font></p>  	    <p><font face="verdana" size="2">Lo anterior condice con las caracter&iacute;sticas biol&oacute;gicas de los linfomas MALT. Esta informaci&oacute;n sugiere que tratamientos locales puedan ser insuficientes para prevenir recurrencias y cubrir posible diseminaci&oacute;n al momento del diagn&oacute;stico, por lo que es</font> <font face="verdana" size="2">fundamental realizar un acucioso estudio de etapificaci&oacute;n, lo que permite decidir el tratamiento m&aacute;s adecuado. Se han realizado estudios con terapias sist&eacute;micas como Rituximab que ha demostrado seguridad y eficacia, sin embargo, la terapia &oacute;ptima todav&iacute;a no est&aacute; definida, faltando estudios que permitan establecerla<sup>48</sup>. Aun as&iacute;, presentan una buena respuesta a tratamiento, con una sobrevida a 10 a&ntilde;os mayor a 75%<sup>49</sup>.</font></p>      <p><font face="verdana" size="2">Como conclusi&oacute;n, podemos afirmar que los linfomas MALT de gl&aacute;ndulas salivales, especialmente de par&oacute;tida son una entidad poco frecuente, pero de buen pron&oacute;stico dado fundamentalmente por su curso indolente y permanecer localizados por tiempo prolongado. El diagn&oacute;stico histopatol&oacute;gico es dif&iacute;cil, por lo que requiere ser complementado con estudios de inmunofenotipo. Se hace necesario un buen estudio de etapificaci&oacute;n, para poder decidir un tratamiento adecuado y evitar as&iacute; recurrencias en el curso de su evoluci&oacute;n, las cuales son mayores cuando se presentan en esta particular localizaci&oacute;n.</font></p>  	    <p><font face="verdana" size="3"><b>BIBLIOGRAF&Iacute;A</b></font></p>      ]]></body>
<body><![CDATA[<!-- ref --><p><font face="verdana" size="2">1.&nbsp;GARC&Iacute;A-DE-H0MBRE A, MAYAN0 L. Linfoma no Hodgkin. A prop&oacute;sito de un caso. Rev Otorrinolaringol Cir Cabeza Cuello 1999; 59: 167-72.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0718-4816201200010001100001&pid=S0718-48162012000100011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p><font face="verdana" size="2">2.&nbsp;KINOSHITA T, ISHII K, NAGANUMA H, OKITSU T. MR</font> <font face="verdana" size="2">imaging findings of parotid tumors with pathologic diagnostic clues: a pictorial essay. <i>Clin Imaging</i> 2004; 28: 93&#45;101.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0718-4816201200010001100002&pid=S0718-48162012000100011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p><font face="verdana" size="2">3.&nbsp;MEER S, ALTINI M. CK7+/CK20&#45;immunoexpression profile is typical of salivary gland neoplasia.</font> <font face="verdana" size="2"><i>Histopathology</i> 2007; 51: 26&#45;32.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0718-4816201200010001100003&pid=S0718-48162012000100011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p><font face="verdana" size="2">4.&nbsp;THIEBLEMONT C, BERGER F, COIFFIER B. Mucosa&#45;associated lymphoid tissue lymphoma. <i>Curr Opin Oncol 1995;</i> 7: 415&#45;20.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0718-4816201200010001100004&pid=S0718-48162012000100011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p><font face="verdana" size="2">5.&nbsp;The Non&#45;Hodgkin's Lymphoma Classification Project. A clinical evaluation of the International Lymphoma Study Group classification of non&#45;Hodgkin's lymphoma. Blood 1997; 89: 3909&#45;18.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0718-4816201200010001100005&pid=S0718-48162012000100011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
<body><![CDATA[<!-- ref --><p><font face="verdana" size="2">6.&nbsp;ISAACSON PG, WRIGHT DH. Malignant lymphoma of mucosa associated lymphoid tissue. A distinctive of B&#45;cell lymphoma. Cancer 1983; 52:</font> <font face="verdana" size="2">1410&#45;6.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0718-4816201200010001100006&pid=S0718-48162012000100011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p><font face="verdana" size="2">7.&nbsp;HARRIS NL, JAFFE ES, STEIN H. A revised European&#45; American classification of lymphoid</font> <font face="verdana" size="2">neoplasms: a proposal from the International Lymphoma Study Group. Blood 1994; 84: 136-192.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0718-4816201200010001100007&pid=S0718-48162012000100011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p><font face="verdana" size="2">8.&nbsp;HARRIS NL, JAFFE ES, DIEBOLD J. The World Health Organization classification of neoplastic disease of the hematopoetic and lymphoid tissues: report of the Clinical Advisory Committee Meeting&#45;Airlie House, Virginia, November 1997.</font> <font face="verdana" size="2"><i>J Clin Oncol</i> 1997; 17: 3835&#45;49.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0718-4816201200010001100008&pid=S0718-48162012000100011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p><font face="verdana" size="2">9.&nbsp;COHEN S, PETRYK M, VARMA M, KOZUCH P, AMES E,</font> <font face="verdana" size="2">GROSSBARD M. Non&#45;Hodgkin's Lymphoma of Mucosa&#45;Associated Lymphoid Tissue. <i>The Oncologist</i> 2006; 11: 1100&#45;17.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0718-4816201200010001100009&pid=S0718-48162012000100011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p><font face="verdana" size="2">10.&nbsp;ZINZANI PL, MAGAGNOLI M, GALIENI P.</font> <font face="verdana" size="2">Nongastrointestinal low&#45;grade mucosa&#45;associated lymphoid tissue lymphoma: analysis of 75 patients. <i>J Clin Oncol</i> 1999; 17: 1254&#45;8.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0718-4816201200010001100010&pid=S0718-48162012000100011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>      ]]></body>
<body><![CDATA[<!-- ref --><p><font face="verdana" size="2">11.&nbsp;BURTON G, ATWATER S, BOROWITZ M, HUANG A.</font> <font face="verdana" size="2">Extranodal Head and Neck lymphoma Prognosis and Patterns recurrence. <i>Arch Otolaryngol Head Neck</i> Surg 1990; 116(1): 69&#45;73.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0718-4816201200010001100011&pid=S0718-48162012000100011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p><font face="verdana" size="2">12.&nbsp;HORNY HP, FERLITO A, CARBONE A. Laryngeal Lymphoma derived from mucosa associated Lympoid tissue. <i>Ann Otol Rhinol Laryngol</i> 1996;</font> <font face="verdana" size="2">105: 77&#45;583.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0718-4816201200010001100012&pid=S0718-48162012000100011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p><font face="verdana" size="2">13.&nbsp;VEGA F, LIN P, MEDEIROS LJ. Extranodal lymphomas of the head and neck. <i>Ann Diagn Pathol</i> 2005; 9:</font> <font face="verdana" size="2">340&#45;50.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0718-4816201200010001100013&pid=S0718-48162012000100011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p><font face="verdana" size="2">14.&nbsp;ISAACSON P, NORTON A. Malignant lymphoma of the Salivary Glands. Edinburg 1994. Ed Churchill Livingston 67&#45;83.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0718-4816201200010001100014&pid=S0718-48162012000100011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p><font face="verdana" size="2">15.&nbsp;FREEDMAN C, BERG JW, CUTLER SJ. Ocurrence and prognosis of extranodal lymphomas. <i>C&aacute;ncer</i></font> <font face="verdana" size="2">1972; 29: 252&#45;60.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0718-4816201200010001100015&pid=S0718-48162012000100011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>      ]]></body>
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<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="journal">
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<name>
<surname><![CDATA[GARCÍA-DE-H0MBRE]]></surname>
<given-names><![CDATA[A]]></given-names>
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