Abstract
The important radiological findings in the urinary tract are as follows: A. In plain films 1. Parallel lines of calcification following the contours of the collapsed empty bladder. 2. A single thin line of calcification outlining the periphery of the distended bladder. 3. Less commonly, similar calcifications in the lower ureters. B. In the excretion pyelogram 1. Ureteral stasis, going on eventually to stasis plus dilatation of the lower spindle, and eventually of the whole ureter and pelvi-calyceal system. 2. Bladder filling defects. 3. Bladder neck obstruction.

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