Mixed-type liposarcoma: clinicopathological, immunohistochemical, and molecular analysis of a case arising in deep soft tissues of the lower extremity
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A rare case of mixed-type liposarcoma arising in deep soft tissue of the right thigh of a 45-year-old female patient is reported. The neoplasm was completely excised and was composed of an irregular admixture of areas of atypical lipomatous tumor/well-differentiated liposarcoma of the lipoma-like subtype with areas of myxoid/round cell liposarcoma. An amplification of the MDM2 and CDK4 genes respectively in the atypical lipomatous tumor/well-differentiated liposarcoma areas was detected by fluorescence in situ hybridization (FISH) analysis, and translocations of the CHOP and FUS genes were detected by FISH analysis in the myxoid/round cell liposarcoma areas.
KeywordsLiposarcoma Mixed-type liposarcoma MDM2 CDK4 CHOP FUS Immunohistochemistry Cytogenetics
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