<?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>1652-6776</journal-id>
<journal-title><![CDATA[Cuadernos Hospital de Clínicas]]></journal-title>
<abbrev-journal-title><![CDATA[Cuad. - Hosp. Clín.]]></abbrev-journal-title>
<issn>1652-6776</issn>
<publisher>
<publisher-name><![CDATA[Universidad Mayor de San Andrés, Facultad de Medicina]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1652-67762006000200012</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[CUAL ES SU DIAGNOSTICO?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carballo Montesinos]]></surname>
<given-names><![CDATA[Delfo]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mollinedo Martinez]]></surname>
<given-names><![CDATA[Willy]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A">
<institution><![CDATA[,  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>07</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>07</month>
<year>2006</year>
</pub-date>
<volume>51</volume>
<numero>2</numero>
<fpage>87</fpage>
<lpage>89</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_arttext&amp;pid=S1652-67762006000200012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_abstract&amp;pid=S1652-67762006000200012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_pdf&amp;pid=S1652-67762006000200012&amp;lng=en&amp;nrm=iso"></self-uri></article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>EDUCACION MEDICA CONTINUA</b></font></p>     <p align="center"><b><font size="4" face="Verdana, Arial, Helvetica, sans-serif">CUAL ES SU DIAGNOSTICO?</font></b></p>     <p align="center"><b><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Dr. Delfo Carballo Montesinos*, Dr. Willy Mollinedo Martinez**</font></b></p>     <p align="justify"><font size="1" face="Verdana, Arial, Helvetica, sans-serif">* M&eacute;dico Pat&oacute;logo - Master en Anatomia Patol&oacute;gica     <br>   ** M&eacute;dico Cirujano Onc&oacute;logo </font></p> <hr>     <div align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>CASO CLINICO </b></font> </div>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Mujer de 81 a&ntilde;os qui&eacute;n consulta por hematuria intermitente, de dos meses de evoluci&oacute;n. En el examen f&iacute;sico manifiesta dolor en el flanco derecho. El estudio de orina confirma la presencia de c&eacute;lulas sangu&iacute;neas. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El informe de TAC indica &quot;proceso expansivo renal derecho, asociado a adenopat&iacute;a hiliar. No se descarta infiltraci&oacute;n del segmento 6 del h&iacute;gado y de la gl&aacute;ndula suprarrenal ipsilateral&quot;. La paciente es sometida a nefrectom&iacute;a radical derecha. </font></P>     <div align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>ESTUDIO ANATOMOPATOL&Oacute;GICO: </b> </font> </div> <ol type="A">       <li>         ]]></body>
<body><![CDATA[<div align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif" align="justify"> <b>Macroscop&iacute;a:</b> Ri&ntilde;&oacute;n de 11,5 x 8,5 x 6 cm, cuya superficie externa se encuentra deformada por la presencia de una masa tumoral de 8 cm de di&aacute;metro mayor. Esta masa tiene bordes bien definidos, es parduzca con extensas zonas amarillas brillantes, con m&uacute;ltiples n&oacute;dulos sat&eacute;lites. No hay infiltraci&oacute;n de la grasa perirrenal ni de los vasos renales. </font></div>   </li>       <li>         <div align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <b>Microscop&iacute;a:</b> La neoplasia est&aacute; formada por c&eacute;lulas dispuestas en formaciones laminares, trabeculares y tubulares. Los citoplasmas son amplios y claros; sus n&uacute;cleos tienen contornos irregulares y cromatina granular, con mitosis at&iacute;picas. Existe destrucci&oacute;n de c&aacute;lices renales con protrusi&oacute;n de la neoplasia en la luz de &eacute;stos. No se ha encontrado permeaci&oacute;n vascular ni infiltraci&oacute;n de la grasa perirrenal </font></div>   </li>     </ol>     <P align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>DIAGNOSTICO: CARCINOMA DE CELULAS RENALES, TIPO CELULAS CLARAS, ESTADIO T3, NX </b> </font></P>     <p align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>COMENTARIO: </b></font></p>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El carcinoma de c&eacute;lulas renales se origina en estructuras tubulares contorneadas proximales<Sup>1</Sup>. Los carcinomas de los conductos colectores son consideradas como una entidad diferente<Sup>2</Sup>. En </font><font size="2" face="Verdana, Arial, Helvetica, sans-serif">los adultos, representa el 3% de las neoplasias </font><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> malignas. Es m&aacute;s frecuente en varones y en la sexta d&eacute;cada de vida<Sup>3</Sup>, aunque tambi&eacute;n se ha descrito en ni&ntilde;os y adolescentes<Sup>4</Sup>. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Antiguamente, el carcinoma de c&eacute;lulas renales era conocido con el nombre de hipernefroma, t&eacute;rmino introducido por Grawitz, qui&eacute;n pensaba que este tumor se originaba de remanentes de tejido adrenal heterot&oacute;pico dentro del ri&ntilde;&oacute;n<Sup>5</Sup>. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> No se tiene certeza sobre las causas que contribuyen a la formaci&oacute;n de esta neoplasia<Sup>6</Sup>. Se han propuesto varios agentes como virus, estr&oacute;genos, rayos X, metales pesados<Sup>7</Sup>, thorotrast, tabaco, trastornos metab&oacute;licos<Sup>8 </Sup>y otras sustancias hidrocarbonadas arom&aacute;ticas. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> En los &uacute;ltimos a&ntilde;os, los tumores renales se est&aacute;n estudiando a los factores citogen&eacute;ticas<Sup>9</Sup>. En la mayor parte de pacientes afectados se ha encontrado asociaci&oacute;n con anormalidades cromos&oacute;micas. As&iacute;, el carcinoma de c&eacute;lulas renales, tipo c&eacute;lulas claras se preenta con mayor frecuencia en pacientes que tienen deleci&oacute;n terminal del brazo corto del cromosamoma 3. En cambio, el carcinoma renal tipo papilar manifiesta com&uacute;nmente trisom&iacute;as de los cromosomas 7 y 17<Sup>10,11,12 </Sup></font></P>     ]]></body>
<body><![CDATA[<P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Por otra parte, se ha demostrado asociaci&oacute;n </font><font size="2" face="Verdana, Arial, Helvetica, sans-serif">quir&uacute;rgica del carcinoma de c&eacute;lulas renales con el ri&ntilde;&oacute;n poliqu&iacute;stico, s&iacute;ndrome de Hippel-Lindau y esclerosis tuberosa, entre otras<sup>13</sup>.</font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Los tipos histol&oacute;gicos m&aacute;s comunes de esta neoplasia son: a) de c&eacute;lulas claras, b) papilar, c) de c&eacute;lulas crom&oacute;fobas, d) de c&eacute;lulas de tipo conductos colectores, e) medular, f) sarcomatoide y g) mucinoso tubular. Cada una de &eacute;stas tiene pron&oacute;stico y curso cl&iacute;nico diferenciado<sup>14,15,16,17</sup>.</font></P>     <p align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En caso de met&aacute;stasis y cuando se desconoce el sitio primario de la neoplasia, se debe recurrir a t&eacute;cnicas de inmunohistoqu&iacute;mica para confirmar el diagn&oacute;stico. Las c&eacute;lulas del carcinoma renal reaccionan con anticuerpos que se unen a ant&iacute;genos situados en el borde luminal de los t&uacute;bulos renales, como las citoqueratinas de bajo peso molecular<sup>18</sup>.    <br>   Con las nuevas t&eacute;cnicas de inmunohistoqu&iacute;mica se ha mejorado el diagn&oacute;stico diferencial en las neoplasias cuyo patr&oacute;n celular com&uacute;n son las c&eacute;lulas claras<sup>19</sup>. As&iacute;, se ha demostrado la utilidad del CD10 en el diagn&oacute;stico diferencial de esta neoplasia<sup>20</sup>.</font></p>     <p align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El pron&oacute;stico depende de m&uacute;ltiples factores que incluyen: grado nuclear, tama&ntilde;o del tumor, m&aacute;rgenes de infiltraci&oacute;n, tipo histol&oacute;gico y el estadio tumoral<sup>5</sup>. Uno de los principales factores de mal pron&oacute;stico y que debe ser reportado en el informe histopatol&oacute;gico es la invasi&oacute;n de la vena renal por las c&eacute;lulas neopl&aacute;sicas<sup>21,22</sup>.</font></p>     <p align="center"><img src="/img/revistas/chc/v51n2/figura_1_12.jpg" width="319" height="512">    <br> <img src="/img/revistas/chc/v51n2/figura_2_12.jpg" width="320" height="498">    <br> <img src="/img/revistas/chc/v51n2/figura_3_12.jpg" width="320" height="231">    <br> <img src="/img/revistas/chc/v51n2/figura_4_12.jpg" width="322" height="274"></p>     <p align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>REFERENCIAS</b></font></p>     ]]></body>
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