A 52-year-old perimenopausal woman has had vaginal bleeding for a week. She has no medical problems and takes no medications. Hysteroscopy is performed and there is a single, 2-cm, smooth, soft mass protruding into the endometrial cavity. Biopsies are taken. What is the microscopic examination of this lesion most likely to show?
A
Endocervical glands with squamous metaplasia
B
Endometrial glands resembling stratum basalis
C
Papillae with marked cellular atypia Smooth muscle cells in bundles