Genes D M, Vachon L
Department of Radiology, Los Angeles County University of Southern California Medical Center.
Pediatr Radiol. 1989;20(1-2):122-3. doi: 10.1007/BF02010657.
Pylosinus backflow is usually associated with acute obstruction and occurs as the result of increased hydrostatic pressure in the renal pelvis. Microruptures or tears occur at the calyceal fornix. The extravasating urine may then be absorbed by lymphatics, rupture into veins, or dissect in the renal sinus. As extravasating urine extends from the peripelvic tissues into the perirenal space, it becomes easily visualized by ultrasound as a perirenal fluid collection. We describe the ultrasound finding of decreased peripelvic echogenicity in an infant with ureteropelvic junction obstruction and peripelvic urine extravasation. To our knowledge this finding on ultrasound has not been previously described. If not for the peripelvic decreased echogenicity, the resulting pelvic decompression may have otherwise mimicked a nonobstructed kidney.
肾盂回流通常与急性梗阻相关，是肾盂内静水压力升高的结果。肾盏穹窿处会出现微破裂或撕裂。外渗的尿液随后可能被淋巴管吸收、破裂进入静脉或在肾窦内蔓延。当外渗尿液从肾盂周围组织延伸至肾周间隙时，超声很容易将其显示为肾周液性聚集。我们描述了一名患有输尿管肾盂连接部梗阻和肾盂周围尿液外渗的婴儿超声检查发现肾盂周围回声减低的情况。据我们所知，超声上的这一发现此前尚未有过描述。若不是肾盂周围回声减低，由此导致的肾盂减压可能会被误诊为非梗阻性肾脏。
