Primary Umbilical Endometriosis: Case Report with Literature Review.

Villars nodule, also known as umbilical endometriosis, is a rare umbilical disorder, usually affecting women of child bearing age. Endometriosis is a functional endometrial tissue found outside the uterine cavity, which affects the umbilicus in 0.5-1% of all extragenital sites. Correct diagnosis is challenging and commonly missed, but once a diagnosis has been made, the recommended management is surgical excision. We are reporting a case of primary umbilical endometriosis in a 31-year-old nulliparous patient, who presented with an umbilical mass of one year duration. Histopathology confirmed the diagnosis of endometriosis and the mass was widely excised.