Endometriosis is a benign disease in which endometrial tissue exists outside the endometrium and the myometrium, and it occurs in all parts. We report two cases of abdominal wall endometriosis. Case 1 : A 37-year-old woman complained of a subcutaneous mass with pain associated with her menstrual cycle. She had a solid mass on the right side of the scar 8 years after undergoing a cesarean section. The biopsy from the mass indicated a diagnosis of endometriosis, and she underwent a complete resection of the tumor. Case 2 : A 42-year-old woman presented with persistent lower abdominal pain. She had had a cesarean section 12 years earlier. Computed tomography showed a 12mm mass in the context of the scar associated with tenderness. Wide surgical excision was performed and the pathological diagnosis was endometriosis.
Although endometriosis is a common disease in reproductive women, some reports about abdominal wall endometriosis have been published. Most abdominal wall endometriosis is associated with obstetrics and gynecological surgeries, especially a cesarean section. Many patients complain of a painful subcutaneous mass at the surgical scar. We should consider endometriosis for the differential diagnosis of an abdominal wall mass on a surgical scar and resect totally without residual tumor.