Hibernoma--a rare brown fat tumour.

Hibernoma is a rare benign tumour of brown fat. It is also known as lipoma of brown adipose tissue, lipoma glandular and atypical lipoma. The hibernoma was first described by Merkelin 1906, who called it Pseudolipoma. The name hibernoma is derived from its histological similarity to the brown fat of hibernating animals. They have been found in the neck, back, popliteal space, thighs, axilla, abdominal wall and the mediastinum. They may recur if not completely excised. Malignant change in hiberqoma is not known to occur. The purpose of this study is to document the cinicopatbological and microscopic features of this rare tumour. An attempt is also made to ascertain its relative frequency to other tumours arising from fatty tissue.