Abstract
A 48-year-old female patient was sent to the radiology department for her annual control magnetic resonance imaging (MRI) after mastectomy for breast cancer. The MRI showed a solitary lesion in the manubrium sterni with homogeneous enhancement. Computed tomography (CT) showed a sclerotic lesion. The lesion showed minimal activity on bone scintigraphy. A biopsy was performed and histology revealed a lesion consisting of brown fat. The lesion was diagnosed as an intraosseous hibernoma. This case report highlights the importance of histologic confirmation of a suspected metastasis, since rare lesions can mimic metastases on imaging. J Med Cases. 2017;8(5):145-148 doi: https://doi.org/10.14740/jmc2803w
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