Hyperplastic endometrial polyps from 17 dogs and 14 cats are described. These growths were pedunculated to broad-based and projected into the uterine lumen. They were lined by endometrial epithelium and contained cystic endometrial glands surrounded by a well-vascularized connective tissue stroma. The morphologic evidence suggests that endometrial polyps arise from focal areas of cystic endometrial hyperplasia.
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