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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 27:1658-1659, September 2006
© 2006 American Society of Neuroradiology

Case Report
HEAD & NECK

Imaging Findings of a Hibernoma of the Neck

A.C.B.S. da Motta^a, D.E. Tunkel^c, W.H. Westra^b and D.M. Yousem^a

^a Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins Hospital, Baltimore, Md
^b Department of Pathology, The Johns Hopkins Hospital, Baltimore, Md
^c Department of Otolaryngology, The Johns Hopkins Outpatient Center, Baltimore, Md

Address correspondence to David M. Yousem, MD, The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins Hospital, 600 N. Wolfe St, Phipps B-112, Baltimore, MD 21287; e-mail: dyousem1{at}jhu.edu

SUMMARY: Hibernoma is an uncommon benign fatty tumor that arises from the vestiges of fetal brown fat. We present a case report of a hibernoma of the neck in an asymptomatic 19-year-old girl and describe the important imaging findings. Computed tomography (CT) shows a well defined hypodense mass with septations. Magnetic resonance imaging (MRI) shows intermediate T1 and bright T2 signal of the mass and also demonstrates the characteristic marked contrast enhancement.