Thickening of the renal collecting system: a nonspecific finding at US.

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Abstract
The records of 22 patients in whom wall thickening of the renal collecting system was seen at ultrasound (US) were retrospectively reviewed. Wall thickening was found in 15 patients with renal transplant and seven with native kidneys. Severe thickening occurred with transplant rejection with urinary tract infection, reflux, or chronic obstruction in both transplanted and native kidney. Severe thickening occurred with transplant rejection, but thicknening also occurred with urinary tract infection, reflux, or chronic obstruction in both transplanted and native kidney. As such, thickening of the renal collecting system seen at US is a nonspecific finding that must be correlated with the clinical and laboratory finding.