<?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>2306-4102</journal-id>
<journal-title><![CDATA[Acta ortopédica mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Acta ortop. mex]]></abbrev-journal-title>
<issn>2306-4102</issn>
<publisher>
<publisher-name><![CDATA[Colegio Mexicano de Ortopedia y Traumatología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2306-41022024000200113</article-id>
<article-id pub-id-type="doi">10.35366/115082</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Parosteal osteosarcoma with low grade chondrosarcoma and liposarcoma components. A rare histologic variant. Case report and literature review]]></article-title>
<article-title xml:lang="es"><![CDATA[Osteosarcoma parosteal con componentes de condrosarcoma y liposarcoma de bajo grado. Una variante histológica poco frecuente. Reporte de caso y revisión de la literatura]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Estrada-Villaseñor]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A3 "/>
<xref ref-type="aff" rid="Af1"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pichardo-Bahena]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cedeño-Garcidueñas]]></surname>
<given-names><![CDATA[AL]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Delgado-Cedillo]]></surname>
<given-names><![CDATA[EA]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marín-Arriaga]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arguelles-Pérez]]></surname>
<given-names><![CDATA[DA]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,National Institute of Rehabilitation Luis Guillermo Ibarra Ibarra  ]]></institution>
<addr-line><![CDATA[Tlalpan, Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,National Institute of Rehabilitation Luis Guillermo Ibarra Ibarra Pathological Anatomy Service ]]></institution>
<addr-line><![CDATA[Tlalpan, Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,National Institute of Rehabilitation Luis Guillermo Ibarra Ibarra  ]]></institution>
<addr-line><![CDATA[Tlalpan, Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,National Institute of Rehabilitation Luis Guillermo Ibarra Ibarra Bone Tumors Service ]]></institution>
<addr-line><![CDATA[Tlalpan, Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,National Institute of Rehabilitation Luis Guillermo Ibarra Ibarra Magnetic Resonance Service ]]></institution>
<addr-line><![CDATA[Tlalpan, Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,National Institute of Rehabilitation Luis Guillermo Ibarra Ibarra Nuclear Medicine Service ]]></institution>
<addr-line><![CDATA[Tlalpan, Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2024</year>
</pub-date>
<volume>38</volume>
<numero>2</numero>
<fpage>113</fpage>
<lpage>118</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2306-41022024000200113&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2306-41022024000200113&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2306-41022024000200113&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Introduction:  conventional parosteal osteosarcoma is an uncommon malignant bone tumor, comprising 4% of all osteosarcomas. Although rare, parosteal osteosarcoma is the most common type of osteosarcoma of the bone surface. We present the clinical, histological and imaging characteristics of a rare histologic variant of a parosteal osteosarcoma, review the literature and emphasize the importance of radio-pathological correlation as well as the interpretation of a representative biopsy in order to obtain the correct diagnosis.  Case report:  a 36-year old woman began her one year prior to admission to the hospital with increased volume in the left knee and pain. Image studies showed a juxtacortical heterogeneous tumor localized on the posterior surface of the distal femoral metaphysis. An incisional biopsy was performed, with the diagnosis of a Parosteal Osteosarcoma and a wide surgical resection was undertaken. According to the findings of the surgical specimen, the diagnosis of a Parosteal Osteosarcoma with low grade chondrosarcoma and liposarcoma components was made. The knowledge of this rare parosteal osteosarcoma variant can lead the orthopedic oncologists to avoid overlooking the adipose component and provide adequate surgical margins.  Conclusion:  we present the clinical, histological and imaging characteristics of a Parosteal Osteosarcoma with low grade liposarcoma and chondrosarcoma components.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Introducción:  el osteosarcoma parosteal convencional es un tumor óseo maligno poco común, que comprende el 4% de todos los osteosarcomas. Aunque es poco común, el osteosarcoma parosteal es el tipo más común de osteosarcoma de la superficie ósea. Presentamos las características clínicas, histológicas y de imagen de una variante histológica rara de un osteosarcoma parosteal, revisamos la literatura y enfatizamos la importancia de la correlación radio-patológica, así como la interpretación de una biopsia representativa para obtener el diagnóstico correcto.  Reporte de caso:  mujer de 36 años inició su cuadro un año antes de su ingreso al hospital con aumento de volumen en rodilla izquierda y dolor. Los estudios de imagen mostraron una tumoración heterogénea yuxtacortical localizada en la superficie posterior de la metáfisis femoral distal. Se realizó biopsia incisional, con diagnóstico de osteosarcoma parosteal y se realizó resección quirúrgica amplia. De acuerdo con los hallazgos de la pieza quirúrgica se realizó el diagnóstico de osteosarcoma parosteal con componentes de condrosarcoma y liposarcoma de bajo grado. El conocimiento de esta rara variante de osteosarcoma parosteal puede llevar a los ortopedistas oncólogos a considerar otros componentes y proporcionar márgenes quirúrgicos adecuados.  Conclusión:  presentamos las características clínicas, histológicas y de imagen de un osteosarcoma parosteal con componentes de liposarcoma y condrosarcoma de bajo grado.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[parosteal osteosarcoma]]></kwd>
<kwd lng="en"><![CDATA[low grade chondrosarcoma]]></kwd>
<kwd lng="en"><![CDATA[well differentiated liposarcoma]]></kwd>
<kwd lng="en"><![CDATA[radio-pathological correlation]]></kwd>
<kwd lng="en"><![CDATA[representative biopsy.]]></kwd>
<kwd lng="es"><![CDATA[osteosarcoma parosteal]]></kwd>
<kwd lng="es"><![CDATA[condrosarcoma de bajo grado]]></kwd>
<kwd lng="es"><![CDATA[liposarcoma de bajo grado bien diferenciado]]></kwd>
<kwd lng="es"><![CDATA[correlación radio-patológica]]></kwd>
<kwd lng="es"><![CDATA[biopsia representativa]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Okada]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
<name>
<surname><![CDATA[Frassica]]></surname>
<given-names><![CDATA[FJ]]></given-names>
</name>
<name>
<surname><![CDATA[Sim]]></surname>
<given-names><![CDATA[FH]]></given-names>
</name>
<name>
<surname><![CDATA[Beabout]]></surname>
<given-names><![CDATA[JW]]></given-names>
</name>
<name>
<surname><![CDATA[Bond]]></surname>
<given-names><![CDATA[JR]]></given-names>
</name>
<name>
<surname><![CDATA[Unni]]></surname>
<given-names><![CDATA[KK]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Parosteal osteosarcoma. A clinicopathological study]]></article-title>
<source><![CDATA[J Bone Joint Surg Am]]></source>
<year>1994</year>
<volume>76</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>366-78</page-range></nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lazar]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Fletcher Mertens F Parosteal osteosarcoma]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[CDM Bridge]]></surname>
<given-names><![CDATA[JA]]></given-names>
</name>
<name>
<surname><![CDATA[Hogendoorn]]></surname>
<given-names><![CDATA[CWH]]></given-names>
</name>
<name>
<surname><![CDATA[Mertens]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
</person-group>
<source><![CDATA[WHO classification of Tumours of soft tissue and bone]]></source>
<year>2013</year>
<edition>4th</edition>
<page-range>292-3</page-range><publisher-loc><![CDATA[Lyon ]]></publisher-loc>
<publisher-name><![CDATA[IARC Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<label>3</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Prabowo]]></surname>
<given-names><![CDATA[Y]]></given-names>
</name>
<name>
<surname><![CDATA[Kamal]]></surname>
<given-names><![CDATA[AF]]></given-names>
</name>
<name>
<surname><![CDATA[Kodrat]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Prasetyo]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Maruanaya]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Efar]]></surname>
<given-names><![CDATA[TS]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Parosteal osteosarcoma: a benign-looking tumour, amenable to a variety of surgical reconstruction]]></article-title>
<source><![CDATA[Int J Surg Oncol]]></source>
<year>2020</year>
<volume>2020</volume>
<page-range>4807612</page-range></nlm-citation>
</ref>
<ref id="B4">
<label>4</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hang]]></surname>
<given-names><![CDATA[JF]]></given-names>
</name>
<name>
<surname><![CDATA[Chen]]></surname>
<given-names><![CDATA[PC]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Parosteal osteosarcoma]]></article-title>
<source><![CDATA[Arch Pathol Lab Med]]></source>
<year>2014</year>
<volume>138</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>694-9</page-range></nlm-citation>
</ref>
<ref id="B5">
<label>5</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bertoni]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Bacchini]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Staals]]></surname>
<given-names><![CDATA[EL]]></given-names>
</name>
<name>
<surname><![CDATA[Davidovitz]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Dedifferentiated parosteal osteosarcoma: the experience of the Rizzoli Institute]]></article-title>
<source><![CDATA[Cancer]]></source>
<year>2005</year>
<volume>103</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>2373-82</page-range></nlm-citation>
</ref>
<ref id="B6">
<label>6</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Delling]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Werner]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Pathomorphology of parosteal osteosarcoma. Experience with 125 cases in the Hamburg Register of Bone Tumors]]></article-title>
<source><![CDATA[Orthopade]]></source>
<year>2003</year>
<volume>32</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>74-81</page-range></nlm-citation>
</ref>
<ref id="B7">
<label>7</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Larousserie]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Chen]]></surname>
<given-names><![CDATA[X]]></given-names>
</name>
<name>
<surname><![CDATA[Ding]]></surname>
<given-names><![CDATA[Y]]></given-names>
</name>
<name>
<surname><![CDATA[Kreshak]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Cocchi]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Huang]]></surname>
<given-names><![CDATA[X]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Parosteal osteoliposarcoma: a new bone tumor (from imaging to immunophenotype)]]></article-title>
<source><![CDATA[Eur J Radiol]]></source>
<year>2013</year>
<volume>82</volume>
<numero>12</numero>
<issue>12</issue>
<page-range>2149-53</page-range></nlm-citation>
</ref>
<ref id="B8">
<label>8</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sohier]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Rodrigues]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Anract]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Feydy]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Larousserie]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Parosteal osteosarcoma associated with a low-grade component mimicking well-differentiated liposarcoma: a case report]]></article-title>
<source><![CDATA[Skeletal Radiol]]></source>
<year>2021</year>
<volume>50</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>243-8</page-range></nlm-citation>
</ref>
<ref id="B9">
<label>9</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jeyaraman]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Muthu]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Gangadaran]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Ranjan]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Jeyaraman]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Prajwal]]></surname>
<given-names><![CDATA[GS]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Osteogenic and chondrogenic potential of periosteum-derived mesenchymal stromal cells: do they hold the key to the future?]]></article-title>
<source><![CDATA[Pharmaceuticals (Basel)]]></source>
<year>2021</year>
<volume>14</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>1133</page-range></nlm-citation>
</ref>
<ref id="B10">
<label>10</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ito]]></surname>
<given-names><![CDATA[Y]]></given-names>
</name>
<name>
<surname><![CDATA[Fitzsimmons]]></surname>
<given-names><![CDATA[JS]]></given-names>
</name>
<name>
<surname><![CDATA[Sanyal]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Mello]]></surname>
<given-names><![CDATA[MA]]></given-names>
</name>
<name>
<surname><![CDATA[Mukherjee]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[O&#8217;Driscoll]]></surname>
<given-names><![CDATA[SW]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Localization of chondrocyte precursors in periosteum]]></article-title>
<source><![CDATA[Osteoarthritis Cartilage]]></source>
<year>2001</year>
<volume>9</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>215-23</page-range></nlm-citation>
</ref>
<ref id="B11">
<label>11</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hah]]></surname>
<given-names><![CDATA[YS]]></given-names>
</name>
<name>
<surname><![CDATA[Joo]]></surname>
<given-names><![CDATA[HH]]></given-names>
</name>
<name>
<surname><![CDATA[Kang]]></surname>
<given-names><![CDATA[YH]]></given-names>
</name>
<name>
<surname><![CDATA[Park]]></surname>
<given-names><![CDATA[BW]]></given-names>
</name>
<name>
<surname><![CDATA[Hwang]]></surname>
<given-names><![CDATA[SC]]></given-names>
</name>
<name>
<surname><![CDATA[Kim]]></surname>
<given-names><![CDATA[JW]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Cultured human periosteal-derived cells have inducible adipogenic activity and can also differentiate into osteoblasts in a perioxisome proliferator-activated receptor-mediated fashion]]></article-title>
<source><![CDATA[Int J Med Sci]]></source>
<year>2014</year>
<volume>11</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>1116-28</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
