Amis E S, Cronan J J, Pfister R C
J Comput Assist Tomogr. 1982 Jun;6(3):511-3. doi: 10.1097/00004728-198206000-00013.
Noncontrast renal computed tomography (CT) has been advocated for the evaluation of the poorly functioning or nonvisualized kidney. However, some conditions can mimic hydronephrosis on such scans, leading to a false positive diagnosis of renal obstruction; two entities include peripelvic cysts and subcapsular hematoma. Illustrative cases are presented. Close attention to attenuation values and basic renal anatomic configurations will usually elucidate the true nature of equivocal findings. However, when hydronephrosis is still suspected on noncontrast renal CT, postcontrast images should be obtained or the finding further evaluated with other radiographic modalities.
非增强肾计算机断层扫描（CT）已被推荐用于评估功能不良或未显影的肾脏。然而，某些情况在这类扫描中可模拟肾积水，导致肾梗阻的假阳性诊断；其中两种情况包括肾盂周围囊肿和肾包膜下血肿。现展示一些病例。密切关注衰减值和基本的肾脏解剖结构通常能阐明可疑发现的真实性质。然而，当非增强肾CT仍怀疑有肾积水时，应获取增强后的图像或用其他影像学检查方法进一步评估该发现。
