Aggressive angiomyolipoma

Case contributed by Chris O'Donnell


Incidental finding on upper abdominal US. Asymptomatic.

Patient Data

Age: 70
Gender: Female

Echogenic mass consistent with fat and without blood flow entering the renal sinus.  Renal vein invasion was not appreciated.


Hypodense mass with HU of -62 (fat) arising in the upper pole cortex of the kidney and entering the renal vein and possibly the extra-renal fat at the upper pole adjacent to the adrenal

Case Discussion

This is a rare but recognized complication of AML.  It is not a sign of true malignancy rather a locally aggressive phenomenon that is treated by nephrectomy in order to prevent spread to the lungs as emboli.

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