Epidemiology
A rare benign tumor of brown fat, which usually appears in young or middle-aged adults. On imaging it can look highly vascular or metabolically active, which can mimic a more aggressive lesion.
Basic features
It can be deep and vascular, with atypical fat signal on MRI that can mimic a liposarcoma.
Usual treatment
Marginal resection confirms the diagnosis and resolves symptoms when the mass grows or is bothersome.
Outcomes and prognosis
It does not metastasize and recurrence is rare if removal is complete.