Carter A R, Horgan J G, Jennings T A, Rosenfield A T
Radiology. 1985 Feb;154(2):499-502. doi: 10.1148/radiology.154.2.3880914.
A triangular echogenic area in the upper pole renal parenchyma can be identified at times during routine sonography of the right kidney. Thirty such cases are presented. Occasionally similar echogenic defects in the parenchyma can be seen posteriorly in the lower pole and in the left kidney. These defects in the parenchyma result from normal extensions of the renal sinus of kidneys that have a distinct division of their upper and lower poles. This is due to partial fusion of two embryonic parenchymatous masses called renunculi. The defects in the parenchyma occur at the junction of the renunculi; hence we have termed them junctional parenchymal defects. In order to differentiate them from pathologic conditions, one must identify their characteristic location and demonstrate continuity with the renal sinus.
在右肾常规超声检查时，有时可在上极肾实质内发现一个三角形回声区。本文报告了30例此类病例。偶尔在下极后方及左肾实质内也可见类似的回声缺损。这些实质内的缺损是由于肾脏肾窦的正常延伸所致，这些肾脏的上下极有明显的分隔。这是由于两个称为肾小叶的胚胎实质团块部分融合所致。实质内的缺损发生在肾小叶的交界处；因此我们将其称为交界性实质缺损。为了将它们与病理情况区分开来，必须确定其特征性位置并证明与肾窦连续。
