Following childbirth by caesarean section, where in general a low-horizontal incision is made on the abdomen, it has been reported in a small minority of patients that endometriosis can occur within the scar. There is generally a delay of three to six months before periods return to normal, but in that time it is well reported that endometrial gland tissue can continue to grow, producing an expanding lump that occurs cyclically (timed with menstruation).
The mechanism is generally unrecognised endometriosis, which has been inadvertently trapped within the abdominal wound during delivery.
Surgery to remove such lesions is undertaken, not by laparoscopy, but by a small incision within the original caesarean scar. It would be usual to undertake a laparoscopy at the same time to ensure that other deposits of endometriosis can be safely removed.