- Slow growing neoplasm of mature adipose tissue
- Arise from epicardium, myocardium or endocardium, even interatrial septum
- Common in right atrium at level of interatrial septum
- Epicardial location, narrow attachment point and growth into pericardial space is typical
- Well circumscribed
- Homogeneous fat attenuation (-50 to -150 HU)
- Occasionally show internal soft tissue septa
- D/D: lipomatous hypertrophy of interatrial septum. Accumulation of brown fat results in diameter of septum > 2 cm. It spares the fossa ovalis giving a dumb-bell appearance
- Fat signal in T1 and T2
- No soft tissue component
- No contrast enhancement
- If any soft tissue component or enhancement seen – possible sarcomatous change
Kimura, Fumiko, et al. “Myocardial fat at cardiac imaging: how can we differentiate pathologic from physiologic fatty infiltration?.” Radiographics 30.6 (2010): 1587-1602.
Motwani, Manish, et al. “MR imaging of cardiac tumors and masses: a review of methods and clinical applications.” Radiology 268.1 (2013): 26-43.
Sparrow, Patrick J., et al. “MR imaging of cardiac tumors.” Radiographics 25.5 (2005): 1255-1276.