<?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>2183-1351</journal-id>
<journal-title><![CDATA[Acta Radiológica Portuguesa]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Radiol Port]]></abbrev-journal-title>
<issn>2183-1351</issn>
<publisher>
<publisher-name><![CDATA[Sociedade Portuguesa de Radiologia e Medicina Nuclear]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2183-13512026000200901</article-id>
<article-id pub-id-type="doi">10.25748/arp.39792</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Benign Notochordal Tumor: An Embryological Whisper]]></article-title>
<article-title xml:lang="pt"><![CDATA[Tumor Benigno da Notocorda: Um Sussurro Embriológico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vinha]]></surname>
<given-names><![CDATA[Diana da]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro]]></surname>
<given-names><![CDATA[Miguel Oliveira e]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Unidade Local de Saúde de Lisboa Ocidental Serviço de Radiologia ]]></institution>
<addr-line><![CDATA[Lisboa ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Hospital de Portimão, Unidade Local de Saúde do Algarve Serviço de Radiologia ]]></institution>
<addr-line><![CDATA[Portimão ]]></addr-line>
<country>Portugal</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>05</month>
<year>2026</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>05</month>
<year>2026</year>
</pub-date>
<volume>38</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S2183-13512026000200901&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S2183-13512026000200901&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S2183-13512026000200901&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We present the case of a 31-year-old woman with a history of thoracolumbar scoliosis surgically corrected. In the context of lower back pain refractory to conservative treatment, imaging studies were performed, including MRI and CT of the lumbosacral spine and sacroiliac joints. An incidental finding revealed a nodule on the posterior aspect of the S1 vertebral body, with imaging characteristics suggestive of a Benign Notochordal Tumor. No other significant alterations were detected. Benign notochordal cell tumors are rare lesions derived from Notochordal remnants, often discovered incidentally during imaging. These tumors are most frequently located in the clivus and sacrum, where they exhibit characteristic imaging findings, including mild sclerosis, preservation of trabecular bone, and the absence of aggressive features such as cortical destruction or soft tissue involvement. While Benign notochordal cell tumors are benign and typically indolent, their differentiation from chordomas, which are malignant and aggressive, is essential to prevent overtreatment and ensure proper management.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Apresentamos o caso de uma mulher de 31 anos com antecedentes de escoliose toracolombar corrigida cirurgicamente. No contexto de lombalgia refractária ao tratamento conservador, foi realizado um estudo imagiológico com ressonância magnética e tomografia computorizada da coluna lombo-sagrada e articulações sacroilíacas. Como achado incidental, identificou-se um nódulo na vertente posterior do corpo vertebral de S1, com características imagiológicas sugestivas de tumor benigno da notocorda. Não foram detectadas outras alterações significativas. Os Tumores Benignos da Notocorda são lesões raras derivadas de remanescentes da Notocorda, frequentemente descobertas incidentalmente durante estudos de imagem. Estes tumores localizam-se mais frequentemente no clivus e no sacro, onde apresentam características imagiológicas típicas, incluindo esclerose leve, preservação do padrão trabecular ósseo e ausência de características agressivas, como destruição cortical ou envolvimento dos tecidos moles. Embora os Tumores Benignos da Notocorda sejam benignos e, normalmente, indolentes, a sua diferenciação dos cordomas, que são malignos e agressivos, é essencial para evitar tratamentos excessivos e garantir uma correcta orientação.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Tumor benigno da notocorda]]></kwd>
<kwd lng="pt"><![CDATA[Lesões do esqueleto axial]]></kwd>
<kwd lng="pt"><![CDATA[Remanescentes da notocorda.]]></kwd>
<kwd lng="en"><![CDATA[Benign notochordal tumor]]></kwd>
<kwd lng="en"><![CDATA[Axial skeleton lesions]]></kwd>
<kwd lng="en"><![CDATA[Notochord remnants.]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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</article>
