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Perirenal Contrast Medium in Urinary Ascites

Karl Thord Dockray
JAMA. 1965;194(12):1330-1331. doi:10.1001/jama.1965.03090250064031.
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To the Editor:—  It has been suggested that perirenal contrast medium as described in a report of urinary ascites (193:1121, 1965), is the result of opaque material occupying deformed and compressed structures within the kidney (194: 1024, 1965). Unfortunately, limitations of space would not allow illustrations more clearly demonstrating the extrarenal or perirenal location of the opacified urine. Basis for this roentgenographic appearance was confirmed at exploratory laparotomy by the demonstration of clear yellow fluid in the retroperitoneal compartment outside the kidney as mentioned in the third paragraph of the case report. Paul Peters, MD, Department of Urology, Southwestern, commented upon similarities between the findings of this case and the disorder of renal hydrocele in which a normal kidney is found completely contained within a fluid-filled sac.Differentiation of the perirenal halo from a nephrogram or crescent sign might be based on the observation that the calyces of the


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