Albany medical annals . theexamination. The knowledge gained in this way may be sum-marized as follows: 1st. It definitely locates the position of the kidney and usuallyalso the ureter. (See Figure I.) 2nd. Real obstructions in the ureter are accurately located bynoting the lower limit of the hydronephrotic sac which formsabove the obstruction. (See Figure 4.) 3rd. Stones may be accurately located by comparing thecollargol plate with the plate taken at the beginning of the ex-amination. (See Figures III, IV, V.) 4th. The capacity of a hydronephrotic sac can be accuratelydetermined by noting th
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