Hibernoma, an uncommun tumor as a differential diagnosis of liposarcoma ofthe thigh

Hibernomas are benign tumors derived from brown fat of hibernating animals and of human infants. The pathogenesis and malignant potential of hibernoma s remain unclear. They occur generally in adults with a peak incidence in t he third decade and with a predominance in women. However, the lesions may have an heterogeneous presentation that may mimic liposarcomas on MRI. Our report presents a case of hibernoma of the thigh whose the diagnosis initia lly suggested that it was a mixed liposarcoma with myxoid and well differen tiated components.