Surgical Scar and Rectus Abdominus Muscle Endometriosis: A Report of Two Cases

Endometriosis is the presence of functional endometrial glands and stroma outside the uterine cavity. The abdominal wall is an uncommon site of extrapelvic endometriosis, where it usually develops in an old surgical scar. Common presentation includes a palpable mass, cyclic pain during menstruation, bleeding and discharge. Differential diagnosis includes abscess, lipoma, hematoma, sebaceous cyst, suture granuloma, inguinal hernia, incisional hernia, desmoid tumor, sarcoma, lymphoma and primary or metastatic cancer. Endometriosis involving the rectus abdominis muscle is also a rare condition. We present two cases of extrapelvic endometriosis; one is a surgical skin scar (Pfannenstiel Caesarean section cicatrix) endometriosis and the other is a rectus abdominus endometriosis.