Primary Subcutaneous Umbilical Endometriosis: Case Report and Review of the Literature.

We report the case of a patient diagnosed with primary umbilical endometriosis intending to discuss the diagnostic and therapeutic management of this rare disease. A 45-year-old woman suffering from a painful swelling located in the umbilical region, with intact and normal cutaneous aspect, came to our attention. Ultrasonography of the umbilical region showed a nodule with a nonhomogeneous echotexture pattern.