?:definition
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A locally aggressive mesenchymal neoplasm composed either entirely or partly of an adipocytic proliferation showing at least focal nuclear atypia in both adipocytes and stromal cells. \'Atypical lipomatous tumor\' and \'well-differentiated liposarcoma\' are synonyms describing lesions that are morphologically and genetically identical. Amplification of MDM2 and/or CDK4 is almost always present. (WHO 2020)
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