Hibernoma: A case report of a rare soft lipoid tissue in the neck.

Hibernoma is rare and benign soft tissue tumor, arising from persistent fetal brown tissue. Although radiologic features are not specific, certain imaging characteristics, common locations and patient demographics may suggest hibernoma as a differential diagnosis of soft tissue tumors that have fatty components. Total resection is required due to the possibility of sampling errors in myxoid and well differentiated liposarcoma tissue components that resemble hibernoma. We report the case of a young adult with a right supra-clavicular swelling that had been present for 10 years, with no other associated signs. The patient underwent a CT scan and cervical MRI, with surgical removal, confirming the diagnosis of a hibernoma. This article also reviews the current imaging literature of hibernomas.