Diagnosis of Chondroid Lipoma by Fine-needle Aspiration Biopsy

Chondroid lipoma is a rare, recently described soft tissue tumor that mimics extraskeletal chondrosarcoma and myxoid liposarcoma. Reports regarding its cytologic and radiological features are sparse. In this report, we describe the cytologic features of this unusual tumor, which include mixed mature lipocytes and lipoblast-like cells embedded in chondromyxoid matrix. We also describe the "target sign appearance" of this tumor in magnetic resonance imaging studies, resembling a neurogenic tumor. More importantly, we demonstrate that a definitive diagnosis of this unusual tumor can be made by fine-needle aspiration biopsy. The usefulness of cell block in fine-needle aspiration biopsy diagnosis of soft tissue tumors is emphasized.