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- Rare
- Benign, non-functioning
- Adrenocortical dysfunction in 10%
- <5 cm, solitary
- Hematopoietic precursor cells and mature adipose tissue
- May have fibromyxoid degeneration, hemorrhage, necrosis, calcification
- Asymptomatic
- Large lesions sometimes cause abdominal pain or retroperitoneal bleeding
Imaging
- Recognizable capsule
- May have calcification
- Varying amounts of fat
- Myeloid soft tissue component enhances with contrast
- Fat attenuation < -30 HU is typical. Adenomas HU mostly never falls below -20
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