Endometriosis is an enigmatic disease which affects 10% of reproductive age women and commonly involves pelvic organs. Extrapelvic endometriosis involving the anterior abdominal wall is rare and even rarer is the involvement of the rectus abdominis muscles. Abdominal wall endometriosis can be explained by grafting of the endometrial cells to the abdominal wall during laparotomy or pelvic surgery, particularly caesarean section. It can pose a diagnostic dilemma when it presents as a lump in the abdomen and has to be differentiated from the abdominal wall tumours