[CME-Sonography 104: Angiomyolipomas]

CME-Sonography 104: Angiomyolipomas Abstract. Angiomyolipomas are the most common benign kidney tumors. Approximately 80 % are spontaneously occurring tumors, the majority <1.0 cm (approximately 54 %). These tumors do not grow and are harmless. Tumors between 1.0 and 2.5 cm (approx. 44 %) also very rarely grow and remain harmless. Larger tumors are rarely found (about 2 %). These must be carefully monitored, as tumors >4.0 cm can spontaneously manifest dangerous bleeding. Apart from spontaneous occurrence, there are also angiomyolipomas in the context of the tuberous sclerosis complex (TCS). Such tumors are often larger and combined with renal cysts and renal cell carcinomas. Measuring the of echo intensity is important for diagnosis.