Endometrium of cavitary rudimentary horns in unicornuate uteri.

The rudimentary horns removed from ten patients with unicornuate uterus, subclass A1b, were studied by light and scanning electron microscopy. Seven of the horns removed were small in volume (range 7.5-15.7 mL) and three were larger (range 20.8-39.7 mL). In four cases the endometrial cavity communicated with the tubal lumen, hematometra was present in three cases, and endometriosis was diagnosed in six. In six of the seven rudimentary horns...