Müllerian adenofibroma of the endometrium. A report of a case with ultrastructural study

A case of müllerian endometrial adenofibroma is presented and the light and ultrastructural features are described. The tumor arose in the lower uterine segment and was composed of a prominent fibroblastic growth of club-shaped papillae projecting into cystic spaces and into the endometrial canal. The lining epithelium was both mucinous endocervical and endometrial in type. A feature not previously described was smooth muscle within the stromal component. The endometrial adenofibroma is a distinct clinicopathologic entity and is part of the family of uterine mixed mesodermal tumors.