Umbilical endometriosis: A case report

Abstract

We report a 35-year-old woman who presented with a mildly painful, bluish nodule in the umbilicus. Her past medical history and surgical history were unremarkable. Verrucous papules were observed in the umbilical fossa. Urachal cyst was suspected and she was referred to our clinic. Percutaneous needle biopsy of the tumor was performed. The histological features revealed endometriosis. Umbilical endometriosis is rare and can occur after surgery but is generally spontaneous and difficult to diagnose preoperatively. It is important to consider endometriosis for differential diagnosis of umbilical tumors in a woman of sexual activity age.