A connective tissue neoplasm formed by proliferation of mesodermal cells; it is usually highly malignant.

Synonyms: Sarcoma, Epithelioid, Sarcomas, Sarcomas, Soft Tissue, Sarcoma, Sarcoma, Spindle Cell, Sarcoma, Soft Tissue, Soft Tissue Sarcoma, Epithelioid Sarcoma, Epithelioid Sarcomas, Sarcomas, Epithelioid, Spindle Cell Sarcomas, Soft Tissue Sarcomas, Spindle Cell Sarcoma, Sarcomas, Spindle Cell