Fiegler W
Rontgenblatter. 1981 Jul;34(7):262-6.
Ultrasound scans in patients with nonopaque filling defects of the renal pelvis were analysed. Ultrasound can differentiate between nonopaque stones (stronger echo and no shadow) and other causes of filling defects (blood clots and tumors: and strong echo, no shadow). Tumor and blood clot are only to differentiate by the movement and transitory nature of the blood clot. Experimental studies with cadaver kidneys shows that the acoustic shadow behind gas in the renal pelvis (due to fistula etc.) has indistinct margins and reverberation echoes, which contrasts with the distinct acoustic shadow found with calculi.
对肾盂存在非透声性充盈缺损的患者进行了超声扫描分析。超声能够区分非透声性结石（回声较强且无阴影）与其他导致充盈缺损的原因（血凝块和肿瘤：回声较强，无阴影）。肿瘤和血凝块只能通过血凝块的移动性和短暂性来区分。对尸体肾脏进行的实验研究表明，肾盂内气体后方的声影（由于瘘管等原因）边缘模糊且有混响回声，这与结石产生的清晰声影形成对比。
