Intrathoracic Hibernoma

Abstract
HIBERNOMA is the term applied to a rare tumor composed of multiloculated fat cells morphologically similar to, if not absolutely identical with, the cells of the so-called "hibernating gland"of animals. Although evidence for the existence of a homologous structure in human beings is controversial, in embryos and occasionally in adults a tissue indistinguishable from hibernating-gland fat, even to its brown color, is found. The exact relation between this "brown fat" and adult adipose tissue has never been adequately clarified, some writers adhering to the concept that brown fat represents mere remnants of a phase in the development of yellow adipose . . .