Incidental diagnosis of atypical polypoid adenomyoma in a young infertile woman.

Atypical polypoid adenomyoma (APA) is considered to be a rare, benign form of a polypoid mass that exhibits glandular and squamous epithelial cell proliferation with varying degrees of atypia in association with cellular smooth muscle stroma. More frequently it manifests during the reproductive and premenopausal age with a reported mean age of 40 years. The published series indicates an average risk of endometrial carcinoma of 8.