28-year-old woman with endometrial hyperplasia. Photograph obtained at hysteroscopy shows slightly polypoid endometrial hyperplasia

28-year-old woman with endometrial hyperplasia. Hysterosalpingogram obtained during early underfilled phase shows irregularity of endometrial mucosa with multiple filling defects

Polypoid mass in 48-year-old woman who presented with excessive bleeding. Sagittal sonohysterogram shows polypoid and diffuse thickening (arrowheads) caused by hyperplasia only

Endometrial hyperplasia. US image shows an endometrium with diffuse thickening (maximum thickness, 1.74 cm) due to hyperplasia (cursors)

Typical endometrial hyperplasia. Sonohysterogram of a patient with postmenopausal bleeding reveals diffuse, irregular thickening of the endometrium (arrows)

Endometrial hyperplasia, gross