Spontaneous endometriosis of the abdominal wall

Background. The abdominal wall is the commonest site of extrapelvic endometriosis, which usually develops in association with a prior surgical scar. Case: A 28-year-old woman with two endometriomas in the recti abdominis, which developed in a scarless abdomen. Conclusions: Abdominal wall endometrioma can develop spontaneously in the absence of prior surgical scar and should be considered in the differential diagnosis of abdominal wall masses.