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Pseudotumor of the kidney secondary to posterior urethral valves the role of renal back flow and peri renal extravasation


, : Pseudotumor of the kidney secondary to posterior urethral valves the role of renal back flow and peri renal extravasation. Pediatric Radiology 14(4): 215-219

In 3 male neonates, successfully treated for posterior urethral valves, unilateral pseudotumor deformity of the collecting system ensued. Two of them had, preoperatively, a marked ipsilateral perirenal urinary extravasation (urinoma), one in addition gross contralateral renal backflow with moderate leakage to the renal capsule. The other one had slight contralateral backflow to the kidney parenchyma but also urinary ascites. The 3rd patient had considerable unilateral renal backflow on the side of developing deformity but no perirenal extravasation. Out of the 3 patients, 2 had bilateral Grade IV-V vesico-ureteral reflux, in the 3rd patient reflux of the same degree was present and this only on the side opposite to the deformity. In all 3 patients the kidney with the "pseudotumor" became taller and more slender than the normally developing mate. There was either slight or no loss of renal parenchyma. At the last follow-up, 1-3 yr after diagnosis of the valves, kidney function was normal.

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PMID: 6728548


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