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AJNR - American Journal of Neuroradiology

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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

View larger version (100K): [in a new window]   Fig. 1. The unenhanced CT scan shows a well-defined mass superficially located in the posterior neck subcutaneous area, slightly eccentric to the left. It presents with an intermediate attenuation between fat and muscle attenuation.

View larger version (54K): [in a new window]   Fig. 2. A, Sagittal T1-weighted pre-contrast MR image shows a posterior subcutaneous soft tissue mass crossing the midline but slightly eccentric to the left. The mass shows multilobulated septations with intermediate T1 signal intensity. B, On the axial T2-weighted image with fat suppression, this mass demonstrates bright signal intensity. C, The coronal T1-weighted postcontrast image with fat suppression shows a lesion with mild heterogeneous enhancement. No pathologic cervical lymphadenopathy is seen.

View larger version (101K): [in a new window]   Fig. 3. Hibernoma is composed of brown fat cells. At higher power, the predominant cell type is characterized by finely vacuolated cytoplasm imparting a granular appearance.