Hibernoma

A hibernoma is a benign neoplasm of vestigial brown fat. The term was originally used by Gery in 1914.Hibernoma (intermediate magnification). A hibernoma is a benign neoplasm of vestigial brown fat. The term was originally used by Gery in 1914. Patients present with a slow-growing, painless, solitary mass, usually of the subcutaneous tissues. It is much less frequently noted in the intramuscular tissue. It is not uncommon for symptoms to be present for years.Benign neoplasm with 'BROWN FAT' is noted. In general, imaging studies show a well-defined, heterogeneous mass, usually showing a mass which is hypointense to subcutaneous fat on magnetic resonance T1-weight images. Serpentine, thin, low signal bands (septations or vessels) are often seen throughout the tumor. From a macroscopic perspective, there is a well-defined, encapsulated or circumscribed mass, showing a soft, yellow tan to deep brown mass. The size ranges from 1 to 27 cm, although the mean is about 10 cm.