Intraosseous hibernoma: a case report and review of the literature

Excerpt

A hibernoma is a rare lipomatous tumour sharing morphological features with brown fat [1‐3]. Brown fat is involved in thermoregulation and can be focally found in the head and neck region in neonates, children and young adults [4]. Hibernoma is a well-demarcated, slow-growing benign tumour, which rarely recurs after surgical excision. Sixty-one percent of hibernomas occur in the third and fourth decades with a predilection for the upper trunk and thigh. These normally arise in the subcutis or within skeletal muscle [5]. An intraosseous location appears to be very rare in hibernomas. An intraosseous hibernoma of the sacrum has been described by Kumar and colleagues [1]. Thorns and colleagues describe hibernoma-like histological changes in a bone marrow trephine without an apparent mass lesion [2]. Reyes and colleagues describe a case of bilateral femoral hibernomas; however, histological and radiological documentation on this case is not available [3]. We report a case of intraosseous hibernoma within the ilium in a 40-year-old woman and describe its imaging and pathological features. …