Adult Pleomorphic Rhabdomyosarcoma

**Semantic type:** Neoplastic Process

**Definition:** An aggressive rhabdomyosarcoma occurring in adults. The neoplasm is characterized by the presence of bizarre round, spindle, and polygonal cells. Clinical presentation includes a rapidly enlarging painful mass usually in the lower extremities.

**Synonyms:** - Pleomorphic rhabdomyosarcoma, adult type