Retroperitoneal hibernomas are rare, with only a handful of cases reported in the literature. These benign lesions are composed primarily of brown fat and can include varying amounts of white fat, myxoid material, and spindled cells, which makes their imaging characteristics highly variable. Here we present a series of images taken in a 28-year-old-man with pathologically confirmed retroperitoneal hibernoma. Surgical excision was undertaken and resulted in complete removal of the lesion.
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