[Hibernoma: a rare case of cervical mass].

The hibernoma is an uncommon benign tumor thought to arise from the vestiges of the fetal brown fat. The term hibernoma is derived from the microscopic similarity of this tumor to the glandular brown adipose tissue occurring in the organs of hibernation of certain animal species. There are reported about 100 hibernomas in the literature world wide and only a small number of them are in the neck. We report the case of a 33 years old male with a 20 months history of a painless mass in his right neck.