Abstract
Pain due to ureteral obstruction and pain produced by intra-abdominal conditions are often confused with each other. To differentiate between them frequently requires the most painstaking investigation, and presupposes a comprehensive knowledge of the exact mechanism of ureteral obstruction as well as a familiarity with those intraperitoneal conditions which produce pains simulating those caused by ureteral obstruction. I realize the occasional difficulty of properly interpreting the clinical symptoms and physical findings in a given case, but by means of the cystoscope, roentgen ray and a well equipped laboratory, the nature of the majority of such conditions can be ascertained very definitely. The presence of pus in the urine may not signify serious trouble, since it may have its origin in the genitalia or urethra, yet grave conditions, such as tuberculosis of the kidney, pyelonephritis, ureter or kidney stone, may exist with comparatively few pus cells in the urine. The same

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