Clear cell carcinoma developed on hepatic endometriosis: a case report and review of the literature.

Endometriosis is a chronic estrogen-dependent disorder that is generally localized in the pelvis affecting up to 10 % of women in the reproductive age. Extra-pelvic locations are estimated to 9 % of endometriosis women. However, the spread of the disease to parenchymal organs such as the liver is rare. Moreover, malignant transformation of hepatic endometriosis is exceptional. Here, we present a case of hepatic clear cell carcinoma developed on endometriosis lesion in a patient with prior surgery for deep endometriosis with colorectal involvement.