A Case of Spontaneous Umbilical Endometriosis

Umbilical endometriosis, also known as Villar's nodule, is an atypical manifestation of endometriosis. We present a rare case of spontaneous Villar's nodule in a young, nulliparous woman with no history of abdominal surgery or trauma who had no classic symptoms of endometriosis. Clinical examination revealed a painless umbilical nodule, and histopathologic evaluation demonstrated endometrial-type glands and stroma, confirming primary cutaneous endometriosis. Further gynecologic evaluation, including pelvic examination and transvaginal ultrasound, showed no evidence of pelvic endometriosis. We review proposed pathogenic mechanisms, discuss diagnostic considerations, and highlight the importance of prompt gynecologic referral. Early recognition with complete excision and appropriate gynecologic follow-up is essential, particularly in patients desiring future fertility.