CTICasesHibernoma
Imaging findings
Chest radiograph reveals a large, well-circumscribed mass in the right chest wall. On CT, the mass is located deep within the chest wall musculature, demonstrating homogeneous low attenuation with a mean of -38 Hounsfield units, which is denser than subcutaneous fat but less dense than skeletal muscle. Normal vessels are seen passing through the mass and being splayed without invasion.
Key takeaways
A hibernoma is a rare, benign tumor of brown fat that typically occurs in the shoulder girdle, back, or neck. Radiologically, it presents with an intermediate attenuation value between regular fat and skeletal muscle, often between -30 and -50 Hounsfield units, and its prominent vascularity can sometimes lead to a misdiagnosis of a malignant liposarcoma.
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