<?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>0482-5004</journal-id>
<journal-title><![CDATA[Revista Brasileira de Reumatologia]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Bras. Reumatol.]]></abbrev-journal-title>
<issn>0482-5004</issn>
<publisher>
<publisher-name><![CDATA[Elsevier Editora Ltda]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0482-50042012000500010</article-id>
<article-id pub-id-type="doi">10.1590/S0482-50042012000500010</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Diagnóstico por imagem da artrite reumatoide inicial]]></article-title>
<article-title xml:lang="en"><![CDATA[Imaging diagnosis of early rheumatoid arthritis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mota]]></surname>
<given-names><![CDATA[Licia Maria Henrique da]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Laurindo]]></surname>
<given-names><![CDATA[Ieda Maria Magalhães]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santos Neto]]></surname>
<given-names><![CDATA[Leopoldo Luiz dos]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lima]]></surname>
<given-names><![CDATA[Francisco Aires Corrêa]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Viana]]></surname>
<given-names><![CDATA[Sérgio Lopes]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendlovitz]]></surname>
<given-names><![CDATA[Paulo Sérgio]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernandes]]></surname>
<given-names><![CDATA[João Luiz]]></given-names>
</name>
<xref ref-type="aff" rid="A06"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidade de Brasília Faculdade de Medicina ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,UnB Hospital Universitário de Brasília Serviço de Reumatologia]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidade de São Paulo Faculdade de Medicina Hospital das Clínicas]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A04">
<institution><![CDATA[,Hospital da Criança de Brasília José Alencar e Clínica Vila Rica  ]]></institution>
<addr-line><![CDATA[Brasília DF]]></addr-line>
</aff>
<aff id="A05">
<institution><![CDATA[,UnB HUB ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A06">
<institution><![CDATA[,Image Memorial  ]]></institution>
<addr-line><![CDATA[Salvador BA]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2012</year>
</pub-date>
<volume>52</volume>
<numero>5</numero>
<fpage>761</fpage>
<lpage>766</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.br/scielo.php?script=sci_arttext&amp;pid=S0482-50042012000500010&amp;lng=en&amp;nrm=iso&amp;tlng=en"></self-uri><self-uri xlink:href="http://www.scielo.br/scielo.php?script=sci_abstract&amp;pid=S0482-50042012000500010&amp;lng=en&amp;nrm=iso&amp;tlng=en"></self-uri><self-uri xlink:href="http://www.scielo.br/scielo.php?script=sci_pdf&amp;pid=S0482-50042012000500010&amp;lng=en&amp;nrm=iso&amp;tlng=en"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[O diagnóstico precoce da artrite reumatoide é essencial para o manejo adequado da condição. Atualmente, considera-se que a fase inicial da doença constitui uma janela de oportunidade terapêutica para a artrite reumatoide. Embora o diagnóstico seja primordialmente clínico, o desenvolvimento e o aprimoramento de métodos laboratoriais e de imagem têm contribuído para o diagnóstico mais precoce e a determinação da conduta na artrite reumatoide inicial. Neste artigo os autores revisam o papel dos principais métodos de imagem utilizados para a avaliação da artrite reumatoide inicial, notadamente a radiologia convencional, a ultrassonografia e a ressonância magnética.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Early diagnosis of rheumatoid arthritis is essential for its proper management. Currently, the initial phase of rheumatoid arthritis is known to provide a window of therapeutic opportunity. Although the diagnosis is primarily clinical, the development and improvement of laboratory and imaging methods have contributed to earlier diagnosis and determination of procedures in early rheumatoid arthritis. In this article, the authors review the role of the major imaging methods used for assessing early rheumatoid arthritis, especially conventional radiography, ultrasonography, and magnetic resonance imaging.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[artrite reumatoide inicial]]></kwd>
<kwd lng="pt"><![CDATA[radiografia convencional]]></kwd>
<kwd lng="pt"><![CDATA[ultrassonografia]]></kwd>
<kwd lng="pt"><![CDATA[ressonância magnética]]></kwd>
<kwd lng="en"><![CDATA[early rheumatoid arthritis]]></kwd>
<kwd lng="en"><![CDATA[conventional radiography]]></kwd>
<kwd lng="en"><![CDATA[ultrasonography]]></kwd>
<kwd lng="en"><![CDATA[magnetic resonance imaging]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>ARTIGO DE REVIS&Atilde;O</b></font></p>     <p>&nbsp;</p>     <p><font size="4" face="Verdana, Arial, Helvetica, sans-serif"><a name="enda"></a><b>Diagn&oacute;stico por imagem da artrite reumatoide inicial</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Licia Maria Henrique da Mota<sup>I</sup>; Ieda Maria Magalh&atilde;es Laurindo<sup>II</sup>; Leopoldo Luiz dos Santos Neto<sup>III</sup>; Francisco Aires Corr&ecirc;a Lima<sup>IV</sup>; S&eacute;rgio Lopes Viana<sup>V</sup>; Paulo S&eacute;rgio Mendlovitz<sup>VI</sup>; Jo&atilde;o Luiz Fernandes<sup>VII </sup></b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><sup>I</sup>Doutora em Ci&ecirc;ncias M&eacute;dicas, Faculdade de Medicina, Universidade de Bras&iacute;lia - FM-UnB; M&eacute;dica Reumatologista do Servi&ccedil;o de Reumatologia, Hospital Universit&aacute;rio de Bras&iacute;lia - HUB-UnB    <br> <sup>II</sup>Professora Colaboradora, Hospital das Cl&iacute;nicas, Faculdade de Medicina, Universidade de S&atilde;o Paulo - HC-FMUSP    <br> <sup>III</sup>Professor-Associado de Cl&iacute;nica M&eacute;dica e do Servi&ccedil;o de Reumatologia, HUB-UnB    <br> <sup>IV</sup>M&eacute;dico Reumatologista, Servi&ccedil;o de Reumatologia, HUB-UnB    ]]></body>
<body><![CDATA[<br> <sup>V</sup>M&eacute;dico Radiologista, Hospital da Crian&ccedil;a de Bras&iacute;lia Jos&eacute; Alencar e Cl&iacute;nica Vila Rica, Bras&iacute;lia/DF    <br> <sup>VI</sup>M&eacute;dico Radiologista, HUB-UnB    <br> <sup>VII</sup>M&eacute;dico Radiologista, Image Memorial, Salvador/BA</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a href="#end">Correspond&ecirc;ncia para</a></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1" noshade>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>RESUMO</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">O diagn&oacute;stico precoce da artrite reumatoide &eacute; essencial para o manejo adequado da condi&ccedil;&atilde;o. Atualmente, considera-se que a fase inicial da doen&ccedil;a constitui uma janela de oportunidade terap&ecirc;utica para a artrite reumatoide. Embora o diagn&oacute;stico seja primordialmente cl&iacute;nico, o desenvolvimento e o aprimoramento de m&eacute;todos laboratoriais e de imagem t&ecirc;m contribu&iacute;do para o diagn&oacute;stico mais precoce e a determina&ccedil;&atilde;o da conduta na artrite reumatoide inicial. Neste artigo os autores revisam o papel dos principais m&eacute;todos de imagem utilizados para a avalia&ccedil;&atilde;o da artrite reumatoide inicial, notadamente a radiologia convencional, a ultrassonografia e a resson&acirc;ncia magn&eacute;tica.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Palavras-chave:</b> artrite reumatoide inicial, radiografia convencional, ultrassonografia, resson&acirc;ncia magn&eacute;tica.</font></p> <hr size="1" noshade>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>INTRODU&Ccedil;&Atilde;O</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">A artrite reumatoide (AR) &eacute; uma doen&ccedil;a inflamat&oacute;ria sist&ecirc;mica cr&ocirc;nica e progressiva que acomete preferencialmente a membrana sinovial, podendo levar &agrave; destrui&ccedil;&atilde;o &oacute;ssea e cartilaginosa.<sup>1 </sup>Trata-se de condi&ccedil;&atilde;o frequente (1%-2% da popula&ccedil;&atilde;o mundial), com ocorr&ecirc;ncia observada em todos os grupos &eacute;tnicos.<sup>2 </sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Nos &uacute;ltimos anos a generaliza&ccedil;&atilde;o do conceito de AR "inicial" ou "precoce" e da exist&ecirc;ncia de uma janela de oportunidade terap&ecirc;utica - per&iacute;odo de tempo no qual a institui&ccedil;&atilde;o de terapia adequada para a doen&ccedil;a acarretaria marcada melhora cl&iacute;nica - firmou a no&ccedil;&atilde;o de que diagn&oacute;stico e tratamento precoces podem modificar o curso da doen&ccedil;a.<sup>3 </sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Concomitantemente, foram desenvolvidos ou aprimorados m&eacute;todos laboratoriais e de imagem que contribu&iacute;ram para o diagn&oacute;stico mais precoce e a determina&ccedil;&atilde;o de um progn&oacute;stico da AR inicial, al&eacute;m de terem sido institu&iacute;das mudan&ccedil;as na forma de abordagem terap&ecirc;utica da doen&ccedil;a, com a utiliza&ccedil;&atilde;o de novas classes de drogas.<sup>4 </sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">O diagn&oacute;stico da AR &eacute; estabelecido considerando-se uma associa&ccedil;&atilde;o de achados cl&iacute;nicos. Nenhum teste laboratorial, achado histol&oacute;gico ou exame de imagem, isoladamente, &eacute; capaz de confirm&aacute;-lo. Quando a AR se apresenta em sua forma bem-definida, com todos os comemorativos cl&aacute;ssicos, o reconhecimento &eacute; simples. O diagn&oacute;stico na fase precoce da doen&ccedil;a, entretanto, &eacute; especialmente dif&iacute;cil, j&aacute; que altera&ccedil;&otilde;es sorol&oacute;gicas e radiol&oacute;gicas caracter&iacute;sticas muitas vezes est&atilde;o ausentes.<sup>5 </sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Embora o reconhecimento da AR inicial seja eminentemente cl&iacute;nico, diversos exames complementares podem ser utilizados para auxiliar na confirma&ccedil;&atilde;o diagn&oacute;stica, no diagn&oacute;stico diferencial, na determina&ccedil;&atilde;o de progn&oacute;stico e no acompanhamento da doen&ccedil;a. O presente artigo traz uma breve revis&atilde;o sobre os principais exames de imagem utilizados para o diagn&oacute;stico e o manejo da AR em sua fase inicial, notadamente a radiologia convencional, a ultrassonografia (US) e a resson&acirc;ncia magn&eacute;tica (RM).</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>EXAMES DE IMAGEM</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Diversos m&eacute;todos de imagem s&atilde;o utilizados na avalia&ccedil;&atilde;o da AR, incluindo radiologia convencional, US, cintilografia &oacute;ssea, tomografia computadorizada (TC), RM e densitometria &oacute;ssea.<sup>6 </sup></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">A cintilografia &oacute;ssea, apesar de ser um m&eacute;todo de alta sensibilidade para a detec&ccedil;&atilde;o de condi&ccedil;&otilde;es que levem &agrave; atividade metab&oacute;lica aumentada (como a inflama&ccedil;&atilde;o articular), possui baixas especificidade e resolu&ccedil;&atilde;o espacial. A TC, a despeito de sua alta resolu&ccedil;&atilde;o espacial, tem resolu&ccedil;&atilde;o de contraste limitada, restringindo seu uso na avalia&ccedil;&atilde;o de partes moles, al&eacute;m de n&atilde;o permitir a detec&ccedil;&atilde;o de edema &oacute;sseo medular, limitando sua utilidade na AR precoce. J&aacute; a densitometria &oacute;ssea, embora seja o melhor m&eacute;todo para detectar perda de massa &oacute;ssea, pouco permite inferir al&eacute;m desse dado em si, que &eacute; inespec&iacute;fico e encontrado em outras condi&ccedil;&otilde;es al&eacute;m da AR; ademais, ainda requer padroniza&ccedil;&atilde;o para a finalidade espec&iacute;fica de avaliar atividade da doen&ccedil;a.<sup>7 </sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Mais recentemente, m&eacute;todos de imagem molecular, como a tomografia por emiss&atilde;o de p&oacute;sitrons (PET/CT) e a tomografia computadorizada por emiss&atilde;o de f&oacute;ton &uacute;nico (SPECT), t&ecirc;m sido utilizados para diagnosticar, caracterizar e monitorar a atividade de doen&ccedil;as inflamat&oacute;rias, incluindo a AR.<sup>7-9</sup>A PET/TC utilizando (19)F-fluorodesoxiglicose, por exemplo, detecta com fidelidade a atividade inflamat&oacute;ria em grandes articula&ccedil;&otilde;es de pacientes com AR e pode ser &uacute;til na avalia&ccedil;&atilde;o precoce da extens&atilde;o da AR.<sup>7 </sup>Embora o real papel dessas novas t&eacute;cnicas na investiga&ccedil;&atilde;o da AR ainda n&atilde;o esteja estabelecido, as mesmas s&atilde;o promissoras e &eacute; poss&iacute;vel que, no futuro, passem a ter um papel mais importante no diagn&oacute;stico e na avalia&ccedil;&atilde;o de atividade da doen&ccedil;a.<sup>8 </sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Isso posto, tr&ecirc;s s&atilde;o os m&eacute;todos mais utilizados atualmente na avalia&ccedil;&atilde;o por imagem da AR, pelo tempo de emprego dos mesmos e pela experi&ecirc;ncia acumulada com seu uso: a radiologia convencional, a US e a RM.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"></b>Radiografia</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"></b>A radiologia convencional ainda &eacute; um exame de primeira linha na investiga&ccedil;&atilde;o da AR (seja na modalidade anal&oacute;gica ou na forma digital), indispens&aacute;vel para todos os pacientes j&aacute; na primeira consulta, j&aacute; que as altera&ccedil;&otilde;es radiogr&aacute;ficas fazem parte dos crit&eacute;rios diagn&oacute;sticos da AR.<sup>10 </sup>Al&eacute;m disso, o exame &eacute; relativamente barato e de disponibilidade praticamente universal. Todavia, o m&eacute;todo n&atilde;o &eacute; sens&iacute;vel para demonstrar as altera&ccedil;&otilde;es mais precoces da doen&ccedil;a, principalmente eros&otilde;es &oacute;sseas; edema de partes moles e osteoporose justa-articular s&atilde;o alguns dos primeiros achados radiogr&aacute;ficos a surgir (<a href="#fig1">Figura 1</a>). Os locais primeiramente acometidos &agrave;s radiografias costumam ser as articula&ccedil;&otilde;es metacarpofalangeanas (sobretudo a segunda e a terceira), metatarsofalangeanas (em especial a quinta), interfalangeanas proximais e processos estiloides da ulna e do r&aacute;dio.<sup>11 </sup></font></p>     <p><a name="fig1"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/rbr/v52n5/a10fig01.jpg"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">As les&otilde;es mais caracter&iacute;sticas s&oacute; aparecem tardiamente &agrave; radiografia, e incluem redu&ccedil;&atilde;o do espa&ccedil;o articular (por destrui&ccedil;&atilde;o da cartilagem) e eros&otilde;es &oacute;sseas (<a href="#fig2">Figura 2</a>). Em pacientes com AR avaliados precocemente, apenas 13% apresentam eros&otilde;es &agrave; radiografia convencional na primeira avalia&ccedil;&atilde;o, 28% ap&oacute;s 12 meses, 75% ap&oacute;s 24 meses e 90% ap&oacute;s 60 meses de acompanhamento.<sup>12,13 </sup></font></p>     ]]></body>
<body><![CDATA[<p><a name="fig2"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/rbr/v52n5/a10fig02.jpg"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Nas fases tardias, sequelas como deformidades, subluxa&ccedil;&otilde;es e anquilose podem ser notadas. Nenhuma dessas altera&ccedil;&otilde;es &eacute; patognom&ocirc;nica, mas sua presen&ccedil;a, sobretudo se sim&eacute;trica, associada ao quadro cl&iacute;nico, sugere fortemente a doen&ccedil;a. Todos os pacientes devem ter uma radiografia inicial de base que permita o acompanhamento radiogr&aacute;fico, visando avaliar a progress&atilde;o da doen&ccedil;a e a resposta ao tratamento.<sup>11 </sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"></b>Ultrassonografia</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"></b>A US &eacute; um exame barato, que permite boa avalia&ccedil;&atilde;o de partes moles. O m&eacute;todo detecta espessamento sinovial, l&iacute;quido em articula&ccedil;&otilde;es, bursas e bainhas tend&iacute;neas e anormalidades estruturais de tend&otilde;es, ligamentos e &ecirc;nteses, al&eacute;m de ser capaz de demonstrar eros&otilde;es superficialmente localizadas.<sup>14,15 </sup>Entretanto, &eacute; dependente do examinador e de dif&iacute;cil reprodutibilidade, n&atilde;o sendo ainda inteiramente padronizado para avalia&ccedil;&atilde;o da AR inicial.<sup>16 </sup>Al&eacute;m disso, n&atilde;o permite o estudo de altera&ccedil;&otilde;es profundamente localizadas nas articula&ccedil;&otilde;es, e o feixe ultrass&ocirc;nico n&atilde;o penetra no osso, sendo a avalia&ccedil;&atilde;o &oacute;ssea restrita &agrave; superf&iacute;cie cortical e &agrave;s janelas ac&uacute;sticas dispon&iacute;veis. T&eacute;cnicas como o estudo com <i>Doppler</i> podem ajudar na avalia&ccedil;&atilde;o de atividade da doen&ccedil;a, diferenciando tecido inflamat&oacute;rio ativo <i>(pannus)</i> de inativo. A US pode ser &uacute;til na quantifica&ccedil;&atilde;o da progress&atilde;o da doen&ccedil;a e pode monitorar a resposta &agrave; terapia da AR.<sup>17</sup> Entretanto, a padroniza&ccedil;&atilde;o da quantifica&ccedil;&atilde;o da atividade inflamat&oacute;ria ainda precisa ser mais bem estabelecida &agrave; US.<sup>15 </sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"></b>Resson&acirc;ncia magn&eacute;tica</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"></b>A RM &eacute;, sem d&uacute;vida, entre os m&eacute;todos de imagem atualmente dispon&iacute;veis, o mais sens&iacute;vel para detectar as altera&ccedil;&otilde;es pr&oacute;prias da AR. Ela permite avaliar todas as estruturas acometidas (incluindo partes moles, ossos e cartilagens) e detectar eros&otilde;es precocemente (at&eacute; tr&ecirc;s anos antes das radiografias convencionais). &Eacute; poss&iacute;vel que o padr&atilde;o e o local das altera&ccedil;&otilde;es observadas possam ter implica&ccedil;&atilde;o progn&oacute;stica.<sup>16</sup> O uso de contraste paramagn&eacute;tico (compostos de gadol&iacute;nio) &eacute; formalmente indicado em pacientes com AR, potencializando a detec&ccedil;&atilde;o de espessamento sinovial e &aacute;reas de realce an&ocirc;malo, indicativas de atividade inflamat&oacute;ria tanto nas partes moles como no osso; &aacute;reas de realce no osso medular s&atilde;o vistas antes mesmo do surgimento de eros&otilde;es e indicam risco aumentado para o desenvolvimento das mesmas.<sup>16 </sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">As eros&otilde;es propriamente ditas e o componente tenossinovial da AR s&atilde;o tamb&eacute;m demonstrados com bastante propriedade &agrave; RM, mesmo com radiografias ainda virtualmente normais. O estudo CIMESTRAmostrou que a detec&ccedil;&atilde;o de edema &oacute;sseo &agrave; RM naAR inicial &eacute; o melhor preditor de progress&atilde;o radiol&oacute;gica de eros&atilde;o &oacute;ssea ap&oacute;s dois anos de acompanhamento.<sup>18</sup> Esse resultado foi confirmado por uma revis&atilde;o sistem&aacute;tica recente, que sugeriu que a realiza&ccedil;&atilde;o precoce da RM poderia ser &uacute;til para aumentar o valor preditivo do exame.<sup>19 </sup></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Entre as desvantagens, al&eacute;m do alto custo e do acesso ainda limitado &agrave; tecnologia<sup>20</sup> est&atilde;o a falta de padroniza&ccedil;&atilde;o do m&eacute;todo e de determina&ccedil;&atilde;o do ponto de corte para defini&ccedil;&atilde;o de les&atilde;o (altera&ccedil;&otilde;es semelhantes a eros&otilde;es e sinovite j&aacute; foram descritas em indiv&iacute;duos normais, sem qualquer evid&ecirc;ncia cl&iacute;nica de AR). Al&eacute;m disso, a seda&ccedil;&atilde;o pode ser necess&aacute;ria em pacientes claustrof&oacute;bicos; a posi&ccedil;&atilde;o e o tempo exigidos para o exame podem n&atilde;o ser tolerados por pacientes idosos e/ou debilitados, e algumas contraindica&ccedil;&otilde;es ainda persistem, como para pacientes portadores de marca-passo card&iacute;aco ou de clipes de aneurisma feitos de material ferromagn&eacute;tico.<sup>21 </sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Tentativas de reduzir os custos da RM incluem a utiliza&ccedil;&atilde;o de novas t&eacute;cnicas. O estudo isolado do punho da m&atilde;o dominante parece ser adequado para avalia&ccedil;&atilde;o de pacientes com AR inicial, apresentando boa sensibilidade e especificidade para a detec&ccedil;&atilde;o precoce das altera&ccedil;&otilde;es t&iacute;picas da doen&ccedil;a.<sup>22 </sup>Uma nova t&eacute;cnica proposta ("m&atilde;os em prece" modificada) mostrou-se, em rela&ccedil;&atilde;o &agrave; t&eacute;cnica tradicional, igualmente sens&iacute;vel para detec&ccedil;&atilde;o de altera&ccedil;&otilde;es compat&iacute;veis com a fase precoce da doen&ccedil;a, com grande vantagem em rela&ccedil;&atilde;o ao tempo de exame. Isso permitiria a redu&ccedil;&atilde;o dos custos e a realiza&ccedil;&atilde;o de maior n&uacute;mero de exames no mesmo per&iacute;odo de tempo.<sup>23 </sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">As <a href="#fig3">Figuras 3</a> e <a href="#fig4">4</a> exemplificam diferentes exames de imagem e seus achados, em pacientes com menos de 12 meses de sintomas compat&iacute;veis com AR. A <a href="/img/revistas/rbr/v52n5/a10tab01.jpg">Tabela 1</a> compara vantagens e desvantagens dos principais m&eacute;todos de imagem utilizados na avalia&ccedil;&atilde;o da AR inicial.<sup>24 </sup></font></p>     <p><a name="fig3"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/rbr/v52n5/a10fig03.jpg"></p>     <p>&nbsp;</p>     <p><a name="fig4"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/rbr/v52n5/a10fig04.jpg"></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>CONCLUS&Otilde;ES</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">O diagn&oacute;stico da AR inicial &eacute; eminentemente cl&iacute;nico, mas diversos exames complementares podem ser utilizados, incluindo exames de imagem. Entre os recentes avan&ccedil;os, a RM vem ganhando destaque com elevada sensibilidade em fases bastante precoces. Al&eacute;m disso, m&eacute;todos como PET/TC e SPECT t&ecirc;m sido utilizados para diagnosticar, caracterizar e monitorar a atividade de doen&ccedil;as inflamat&oacute;rias, incluindo a AR.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">As eros&otilde;es radiogr&aacute;ficas &agrave; radiografia convencional permanecem como medida-chave do desfecho estrutural na AR inicial, e seu uso foi recomendado por um comit&ecirc; europeu de reumatologistas, ap&oacute;s detalhada revis&atilde;o de toda a evid&ecirc;ncia dispon&iacute;vel.<sup>25 </sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Embora as radiografias simples permane&ccedil;am indispens&aacute;veis na avalia&ccedil;&atilde;o inicial de todo paciente com AR, h&aacute; muitos estudos sugerindo o uso da US e da RM como m&eacute;todos de imagem de elei&ccedil;&atilde;o, no estado atual da ci&ecirc;ncia, para a avalia&ccedil;&atilde;o de pacientes reumatoides na fase precoce da doen&ccedil;a.<sup>26 </sup>A RM contrastada, em particular, &eacute; extremamente sens&iacute;vel, permitindo detectar &aacute;reas de inflama&ccedil;&atilde;o intra&oacute;ssea antes mesmo do desenvolvimento de eros&otilde;es francas. Refinamentos t&eacute;cnicos desses m&eacute;todos est&atilde;o em estudo e mostram resultados promissores. Ainda &eacute; necess&aacute;rio, entretanto, padronizar tais m&eacute;todos no contexto da doen&ccedil;a reumatoide e definir seu real papel na determina&ccedil;&atilde;o do progn&oacute;stico e na avalia&ccedil;&atilde;o da resposta ao tratamento.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>REFER&Ecirc;NCIAS</b></font></p>     <!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">1. Lee DM, Weinblatt ME. Rheumatoid arthritis. Lancet 2001;358(9285):903-11.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000070&pid=S0482-5004201200050001000001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">2. Alarc&oacute;n GS. Epidemiology of rheumatoid arthritis. Rheum Dis Clin North Am 1995;21(3):589-604.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000072&pid=S0482-5004201200050001000002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">3. Mota LMH. 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Ann Nucl Med 2009;23(9):783-91.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000082&pid=S0482-5004201200050001000007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">8. Basu S, Zhuang H, Torigian DA, Rosenbaum J, Chen W, Alayi A. Functional imaging of inflammatory diseases using nuclear medicine techniques. Semin Nucl Med 2009;39(2):124-45.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000084&pid=S0482-5004201200050001000008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">9. Fonseca A, Wagner J, Yamaga LI, Osawa A, da Cunha ML, Scheinberg M. (18) F-FDG PET imaging of rheumatoid articular and extraarticular synovitis. J Clin Rheumatol 2008;14(5):307.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000086&pid=S0482-5004201200050001000009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">10. Arnett FC, Edworthy SM, Bloch DA, McShane DJ, Fries JF, Cooper NS <i>et al</i>. 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<body><![CDATA[<!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">23. Mota LMH, Mendlovitz S, Carneiro JN, Von Kircheheim RAF, Almeida LA, Lima FAC. Resson&acirc;ncia magn&eacute;tica para avalia&ccedil;&atilde;o da artrite reumatoide inicial - proposta da t&eacute;cnica de "m&atilde;os em prece" modificada &#91;abstract&#93;. In: XXVII Congresso Brasileiro de Reumatologia; 2008 Set 17-20; Macei&oacute;    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000113&pid=S0482-5004201200050001000023&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref -->. Rev Bras Reumatol 2008;48:S235. Abstract 01.020.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000114&pid=S0482-5004201200050001000024&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">24. Mota LMH, Cruz BA, Brenol CV, Pereira IA, Fronza LS, Bertolo MB <i>et al</i>.; Brazilian Society of Rheumatology. 2011 Consensus of the Brazilian Society of Rheumatology for diagnosis and early assessment of rheumatoid arthritis. Rev Bras Reumatol 2011;51(3):199-219.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000116&pid=S0482-5004201200050001000025&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">25. Combe B, Landewe R, Lukas C, Bolosiu HD, Breedvelt F, Dougados M <i>et al</i>. EULAR recommendations for the management of early arthritis: report of a task force of the European Standing Committee for International Clinical Studies Including Therapeutics (ESCISIT). Ann Rheum Dis 2007;66(1):34-45.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000118&pid=S0482-5004201200050001000026&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">26. &#216;stergaard M, D&oslash;hn UM, Ejbjerg BJ, McQueen FM. Ultrasonography and magnetic resonance imaging in early rheumatoid arthritis: recent advances. Curr Rheumatol Rep 2006;8(5):378-85.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000120&pid=S0482-5004201200050001000027&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a name="end"></a><a href="#enda"><img src="/img/revistas/rbr/v52n5/seta.jpg" border="0"></a> <b>Correspond&ecirc;ncia para:</b>    <br> Licia Maria Henrique da Mota    <br>  Centro M&eacute;dico de Bras&iacute;lia. SHLS 716/916, bloco E, salas 501/502 - Asa Sul    <br>  Bras&iacute;lia, DF, Brasil. CEP: 70390-904    <br>  Email: <a href="mailto:liciamhmota@yahoo.com.br">liciamhmota@yahoo.com.br</a></font> </p> <font size="2" face="Verdana, Arial, Helvetica, sans-serif">Recebido em 06/09/2011.    <br> Aprovado, ap&oacute;s revis&atilde;o, em 27/06/2012.     <br> Os autores declaram a inexist&ecirc;ncia de conflito de interesse. </font>     <p>&nbsp;</p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Servi&ccedil;o de Reumatologia, Hospital Universit&aacute;rio de Bras&iacute;lia, Universidade de Bras&iacute;lia - HUB-UnB; Servi&ccedil;o de Reumatologia, Hospital das Cl&iacute;nicas, Faculdade de Medicina, Universidade de S&atilde;o Paulo - HC-FMUSP.</font></p>      ]]></body><back>
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