Umbilical Endometriosis Presenting as Cyclical Umbilical Bleeding: A Case Report

Endometriosis is a benign, estrogen‐dependent condition affecting 6%–10% of women of reproductive age, typically involving pelvic organs but occasionally presenting in extrapelvic locations such as the umbilicus. We report a case of umbilical endometriosis in a nulliparous woman who developed cyclic painful bleeding and umbilical swelling 8 months after a diagnostic laparoscopy for infertility. Surgical excision with primary closure was performed, and histopathology, including positive CD10 immunostaining, confirmed the diagnosis. Umbilical endometriosis (Villar's node) is rare, accounting for approximately 0.5%–1% of endometriosis cases. Diagnosis is primarily clinical—based on cyclical umbilical pain and bleeding—and should be considered in women presenting with an umbilical mass. Complete surgical excision remains the treatment of choice, providing excellent outcomes with a low risk of recurrence or malignant transformation.