. Radiography and radio-therapeutics . the relationship of a doubtful shadow in the line of the ureter, it is important to remember that when the catheter passes the stone it does not follow that the stone is outside the ureter. The catheter may have slipped past the stone in a case where the ureter is dilated. Simi-larly the catheter may lie in front of or behind the stone, and stop at the upper limit of the stone shadow. An opinion may then be given that the stone is not in the ureter. This may be an erroneous conclusion. Stereo-scopic plates will show the correct relationship of the stone t
. Radiography and radio-therapeutics . the relationship of a doubtful shadow in the line of the ureter, it is important to remember that when the catheter passes the stone it does not follow that the stone is outside the ureter. The catheter may have slipped past the stone in a case where the ureter is dilated. Simi-larly the catheter may lie in front of or behind the stone, and stop at the upper limit of the stone shadow. An opinion may then be given that the stone is not in the ureter. This may be an erroneous conclusion. Stereo-scopic plates will show the correct relationship of the stone to the shadow of the catheter. When several shadows are in the ureteral line and the catheter passes 1 , ,1 .,, , Fig. 322a.—Calculi in kidney. between them with a clear interval on either side of its shadow, it may safely be assumed that the shadows are not those of stones in the ureter. Figures 322 and 322a illustrate several stones in the ureter and kidneyon the left side, where the stones at several examinations were seen to have.
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