Extrahepatic Bile Duct Leiomyosarcoma

**Semantic type:** Neoplastic Process

**Definition:** An aggressive malignant smooth muscle neoplasm, arising from an extrahepatic bile duct. It is characterized by a proliferation of neoplastic spindle cells.

**Synonyms:** - Bile Duct Leiomyosarcoma - Leiomyosarcoma of Bile Duct - Leiomyosarcoma of Extrahepatic Bile Duct - Leiomyosarcoma of the Bile Duct - Leiomyosarcoma of the Extrahepatic Bile Duct