Wednesday, December 26, 2012


  • rare, benign tumor composed of brown (immature) fat
  • slow growing, painless soft tissue mass
  • 4 subtypes: typical, myxoid, lipoma-like, spindle cell
  • 3rd-4th decade of life
  • slight female predominance
  • US: well circumscribed, hyperechoic, hypervascular
  • CT: intermuscular mass with density between that of fat and muscle
  • MR: appearance varies based on subtype; branching vessels are often seen; T1WI - usually hyperintense to muscle but hypointense to subcutaneous fat, prominent septa; T2WI - variable
  • NM: moderate uptake on blood pool images in bone scintigraphy
  • PET: increased FDG uptake 
  • Angiography: hypervascular, intense blush, arteriovenous shunting; do not do a core biopsy
  • treatment: surgical resection

Murphey MD, Carroll JF, Flemming DF, et al. Benign musculoskeletal lipomatous lesions. Radiographics 2004;24:1433-66.

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