Pulmonary Vein Leiomyosarcoma

**Semantic type:** Neoplastic Process

**Definition:** An aggressive malignant smooth muscle neoplasm, arising from the pulmonary vein. It is characterized by a proliferation of neoplastic spindle cells.

**Synonyms:** - Leiomyosarcoma of Pulmonary Vein - Leiomyosarcoma of the Pulmonary Vein