Endometriosis is a condition in which endometrial tissue becomes impla
nted on extrauterine sites, most commonly within the pelvis, Malignant
transformation of endometriotic foci is rare, but has been frequently
reported, We describe a patient with a CT scan demonstrating patholog
ically proven perihepatic endometriosis, including malignant transform
ation. Endometrioses should be considered in the differential diagnosi
s of perihepatic masses.