title: Diagnosis of nonopaque calculi by computed tomography.
abstract: Computed tomography can aid in the distinction of calculi from both tumors and clots in the urinary tract. Its availability, simplicity of interpretation, and noninvasiveness establish it as an important diagnostic modality in selected cases when calculus is in the differential diagnosis of upper urinary tract filling defects.
mesh_terms: D000328:Adult; D000368:Aged; D002295:Carcinoma, Transitional Cell / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014057:Tomography, X-Ray Computed; D014514:Ureteral Calculi / Q000000981:diagnostic imaging; D014516:Ureteral Neoplasms / Q000000981:diagnostic imaging; D014545:Urinary Calculi / Q000000981:diagnostic imaging*; D014571:Urologic Neoplasms / Q000000981:diagnostic imaging