Chronic pelvic pain in a woman with at least one history of caesarean should lead to the diagnosis of parietal endometrioma on a caesarean section scar, even years after. The most suggestive clinical picture is chronic cyclical pelvic pain located near the caesarean section scar associated with a pelvic wall mass. On clinical examination, this painful nodule is most often palpable. In order to support the diagnosis, it is advisable to perform a parietal ultrasound, preferably during menstruation and during the painful crisis; however, ultrasound lesions may also be typical outside menstrual period. The standard treatment consists of a large surgical resection with healthy margins, under general anesthesia.