Abstract
Primary umbilical endometriosis is a rare disorder accounting for 0.5%–1% of extragenital endometriosis. It is defined as the presence of ectopic endometrial tissue within the umbilicus. Although it mostly presents as a typical cyclic umbilical discharge coincidental with a palpable mass, the diagnosis is often delayed due to its low prevalence and abnormal presentation, as in this case. The possibility of subcutaneous endometriosis should not be ruled out when an umbilical mass is detected, even if there is no history of previous surgery. Other differential diagnoses of umbilical mass include paraumbilical hernia, surgical scar (laparoscopy), primary umbilical tumor, granuloma, Sister Mary Joseph's nodule, and urachal duct cyst. In our report, we present the case of a 40-year-old female who came with a painless mass in the umbilicus for the past 10 years.
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