Use of Tomography and Ultrasound in the Diagnosis of Nonopaque Renal Calculi

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Abstract
THE PYELOGRAPHIC finding of a nonopaque filling defect in the renal pelvis is a difficult diagnostic problem. Many pathological processes, including blood clot, transitional cell carcinoma, and calculus, may present as an isolated defect in the opacified renal pelvis. Clinical findings, laboratory data, urine cytology, and serial urograms may provide helpful information. Not uncommonly, however, these studies are not diagnostic, and more invasive procedures such as renal arteriography, percutaneous or retrograde brush biopsy, or surgery are necessary. Arteriography and brush biopsy are frequently inconclusive, while surgical exploration of the renal pelvis when tumor is present risks spillage of tumor cells. The accurate diagnosis of nonopaque calculi would obviate the need for more invasive studies in most patients with nonopaque filling defects of the renal pelvis. In this communication the authors will emphasize the use of linear and computerized tomography (CT) as well as ultrasound in the diagnosis of nonopaque or

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