The accuracy of dynamic transabdominal ultrasonography in the detection of bladder tumors is examined. Of 49 bladder tumors 34 between 2 mm. and several centimeters in size could be demonstrated ultrasonographically. Ultrasound failed to visualize tumors less than 5 mm. in size in 14 patients. Dynamic transabdominal ultrasonography cannot replace cystoscopy in the diagnosis or followup of patients with bladder tumors but it may be used instead of cystoscopy in some selected cases.
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