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Angiomyolipoma of the kidney is a neoplasm composed of variable amounts of mature adipose tissue, smooth muscle, and thick-walled blood vessels derived from perivascular epithelioid cells (1â3). Its prevalence in the general hospital population has been reported to be 0.13% in Japan (4).
In a mass with typical ultrasonographic features, fatty attenuation on plain abdominal radiographs, planar tomograms, and CT scans is virtually diagnostic of angiomyolipomas. However, an angiomyolipoma is not the only renal tumor that may contain fat. Rarely, but most importantly, fat may be found in a renal cell carcinoma because of the invasion of perinephric fat or metaplasia in the tumor.