The discovery of a uterine diverticulum is a rare event. Diverticula can lead to outcomes including pelvic pain, ectopic pregnancy, and diverticula rupture and should be considered in cases of uterine cystic masses. We report a case of a 32-year-old G3P0030 with a complicated pregnancy and surgical history who presented to us following an abnormal laparoscopy for severe pelvic pain four years after salpingectomy for a tubal pregnancy. This laparoscopy reported a cornual uterine cystic structure. Saline infusion sonohysterography was performed with fluid filling a uterine cornual cystic mass. On hysteroscopy, no outpouching was identified. With chromopertubation on laparoscopy, methylene blue filled the diverticulum. The diverticulum was laparoscopically removed. Pathology examination was consistent with a diverticulum containing a placental implantation site and necrotic chorionic villi.
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