In this report, we describe a case of endometrial carcinoma arising in one horn of a bicornuate uterus. The diagnosis of this rare combination can be missed unless an unrecognized postmenopausal bleeding alerts the gynecologist to make a careful search for both endometrial cavities that may be curetted. Physicians should remember the possible existence of a separate uterine cavity when endometrial cancer is clinically suspected but histology fails to confirm the diagnosis.
Keywords: Bicornuate uterus; Endometrial cancer; Postmenopausal bleeding; Single horn carcinoma.