Fig. 1

Dysfunctional uterine bleeding. In panel A, a superficial endometrial fragment shed during an episode of dysfunctional bleeding in a 53-year-old woman shows the characteristic menstrual-like stromal breakdown. The overlying epithelium appears regenerative. Panel B illustrates a micropapillary tuft covered with regenerative epithelium showing worrisome features, such as large vesicular nuclei with prominent nucleolus