Uterine Tumors

OVERVIEW
Rare tumors, arising from the uterine smooth muscle and epithelial tissues
Compose 0.3%–0.4% of tumors in dogs and 0.2%–1.5% in cats
Dogs—usually benign; leiomyomas, 85%–90%; leiomyosarcoma, 10%; other types (e.g., carcinoma, fibroma, fibrosarcoma, lipoma) rare
Cats—usually malignant (adenocarcinoma); include leiomyoma, leiomyosarcoma, fibrosarcoma, fibroma, and lipoma
Metastasis—may occur with malignant forms