Adult Botryoid-Type Embryonal Rhabdomyosarcoma

**Semantic type:** Neoplastic Process

**Definition:** A morphologic variant of embryonal rhabdomyosarcoma occurring in adults. The neoplasm arises from organs containing a mucosal epithelial surface. It is characterized by the formation of a cambium layer in the affected tissue and polypoid nodules with an abundant myxoid stroma.

**Synonyms:** - Adult Botryoid Sarcoma