PMC5732500_01
MRI of the hibernoma. The MRI (T1) revealed a 38 mm along the axis mass of the posterior cervical triangle with septa > 2 mm (a), nodular structures (b), muscular invasion (c), and a high vascularization (d).
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PMC5732500_01_12901_2017_46_Fig1_HTML.jpg
Fig1
Both clinical and ultrasound examinations led to suspect a soft tissue mass, and the magnetic resonance imaging (MRI) revealed a 38 mm along the axis tumor (Fig. 1) between the elevator scapulae and the right scalene muscles.
Histopathological findings. The histopathological findings (10x, hematoxylin & eosin) showed mature fat cells (a), abundant eosinophilic cells (b) with small cytoplasmic vacuoles and regular, small, round nuclei (c). The tissue was characterized by a high vascularization (d).
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PMC5732500_01_12901_2017_46_Fig2_HTML.jpg
Fig2
The definitive histopathological examination retained the diagnosis of a hibernoma, which was characterized by mature fat cells, abundant eosinophilic cells with small cytoplasmic vacuoles and regular, small, round cell nuclei (Fig. 2). The 4-years follow-up was unremarkable and the patient had no recurrence.