Hibernoma: a patient examined by CT. 
We describe the computed tomographic (CT) findings in a patient with a hibernoma of the thigh, a rare tumor of brown fat.  There are no specific features to allow differentiation from the more common low grade liposarcoma.  This is in agreement with the only other published report of the CT features of hibernoma.  Although preoperative diagnosis requires biopsy, CT is of value in detecting fatty tumors and in preoperative planning.