Primary umbilical cutaneous endometriosis is a rare umbilical endometrioma that affects women who are within the reproductive age group. It may be associated with infertility and severe dysmenorrhea and can be difficult to diagnosed in an asymptomatic patient.
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Spontaneous Primary Umbilical Endometriosis Preceding Severe Pelvic Endometriosis: A Case Report
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Cutaneous endometriosis - Fernández Vozmediano - 2010 - International Journal of Dermatology - Wiley Online Library
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Primary umbilical endometriosis. Case report and discussion on management options - ScienceDirect
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