Bigongiari L R, Davis R M, Novak W G, Wicks J D, Kass E, Thornbury J R
AJR Am J Roentgenol. 1977 Jul;129(1):89-93. doi: 10.2214/ajr.129.1.89.
Excretory urography occasionally delineates striations of alternating density in the renal parenchyma. Experimental observations on a dog model of ureteric obstruction show that the dense striations have the same dynamic alterations as the obstructive nephrogram. They become progressively more dense to a plateau and then fade with relief of obstruction. Previous obstruction is shown to facilitate visualization of the striations presumably by having dilated the tubules. Previous obstructive episode, previous symptoms, or chronic obstruction were present in each of the clinical cases collected which show a similar striation pattern. We conclude that the dense striations represent shadows produced by hyperconcentrated contrast material which has accumulated in dilated collecting ducts or groups of ducts within the medullary rays.
排泄性尿路造影偶尔可显示肾实质内密度交替的条纹。对输尿管梗阻犬模型的实验观察表明，致密条纹与梗阻性肾图具有相同的动态变化。它们逐渐变得更加致密，达到一个平台期，然后随着梗阻的解除而消退。先前的梗阻被证明可能通过扩张肾小管而促进条纹的显影。所收集的每例临床病例均有先前的梗阻发作、先前的症状或慢性梗阻，且均显示出类似的条纹模式。我们得出结论，致密条纹代表高浓度造影剂积聚在髓放线内扩张的集合管或成群的导管中所产生的阴影。
