Diagnostic value of CT numbers in pelvocalyceal filling defects.

Abstract
Patients (37) with nonopaque pelvocalyceal filling defects on excretory urography, had intrapelvic masses on computed tomography (CT). There were 20 nonopaque stones, 14 cases of transitional-cell carcinoma, 1 benign papilloma and 2 blood clots. All had a sufficiently specific range of CT numbers and differences in contrast enhancement to allow the correct diagnosis on plain CT scans, or, if necessary, a dynamic CT study following a rapid i.v. bolus of contrast medium.

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