An intraosseous lipoma is considered one of the rarest primary bone tumors. The etiology of this lesion remains unclear; many lesions are asymptomatic and appear only as incidental findings during routine radiographic evaluations. Magnetic resonance imaging (MRI) of intraosseous lipomas can help to establish a diagnosis and to stage the neoplasm. This is a case report of a 53-year old man with a rare intraosseous lipoma of the patella. (www.actabiomedica.it)
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