KIT and neoplasm with perivascular epithelioid cell differentiation: Morphologically, the differential diagnoses are clear cell sarcoma (positive for S100, which is usually negative in PEComa), epithelioid GIST (negative for melanocytic markers and positive for CD117), epithelioid leiomyosarcoma and alveolar soft part sarcoma (both negative for melanocytic markers) [24].