[Diagnostic procedure in a solitary angiomyolipoma of the kidney].

The use of excretion urography, sonography, ultrasound-controlled fine-needle puncture, computed tomography and angiography is described in four histologically confirmed cases of solitary renal angiomyolipomas. For the second time, involvement of the inferior vena cava by a benign hamartoma is described. An important advance is the recognition of a characteristic collection of findings consisting of strong echogenicity on ultrasound and fat equivalent hypodensity on CT, together with the cytological findings, which are described for the first time. It was possible to make the diagnosis with a high degree of certainty in two patients, with important therapeutic implications.