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When hyperechoic lesions are noted incidentally on renal ultrasound, additional imaging (computed tomography [CT] or magnetic resonance imaging [MRI]) often can distinguish benign fat-containing angiomyolipomas from solid lesions that might represent renal cell carcinoma. But is additional imaging and surveillance necessary for very small hyperechoic lesions detected on ultrasound?
In this single-center retrospective study, researchers identified 161 patients (mean age, 63) who had incidentally-detected hyperechoic renal lesions measuring 1 cm or smaller on ultrasound and one or more follow-up imaging studies. In 58% of patients, lesions were consistent with angiomyolipoma on CT or MRI; in 12%, lesions were not seen on CT or MRI; and in 3%, …