label: Atypical Lipomatous Tumor/Well Differentiated Liposarcoma
label_lc: atypical lipomatous tumor/well differentiated liposarcoma
description: 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)