PURPOSE: We developed an algorithm using unenhanced computerized tomography (CT) for the management of @entity812 and suspected @entity1695 . MATERIALS AND METHODS: During a 25-month interval 417 @entity1 with @entity812 underwent unenhanced helical CT. The final diagnosis was confirmed by additional imaging or clinical followup. For all @entity1 who underwent additional imaging studies the official dictated radiology reports were used to determine whether the studies were recommended based on CT findings. Cases requiring intervention were evaluated to determine whether additional imaging was performed before the procedure. Medical records were reviewed and/or @entity1 were interviewed to document the course of therapy and long-term outcome. RESULTS: Unenhanced helical CT diagnosed @entity1901 with 95% sensitivity, 98% specificity and 97% accuracy. Of the 38 @entity1 requiring intervention, including nephrostomy catheters in 18, lithotripsy in 3 and ureteroscopic stone extraction in 7, additional imaging (excretory urography) was performed in only 1. Additional imaging studies generated by CT were done in 3 cases in which the dictated reports were indeterminate for ureteral stones, including negative excretory urography in 2 and retrograde urography in 1. In 1 @entity1 in whom CT misdiagnosed a ureteral stone unnecessary retrograde urography revealed the calcification to be a gonadal vein phlebolith. Seven @entity1 with false-negative examinations reported spontaneous stone passage with no complications. CONCLUSIONS: Unenhanced helical CT accurately determines the presence or absence of @entity13364 in @entity1 with @entity812 . CT precisely identifies stone size and location. When @entity13364 is absent, other causes of @entity812 can be identified. In most cases additional imaging is not required.

The value of unenhanced helical computerized tomography in the management of XXXX .

@entity1 :: ('9606', 'Species') :: ['patients', 'patient'] @entity1901 :: ('MESH:D014515', 'Disease') :: ['ureteral stone disease'] @entity1695 :: ('MESH:D014517', 'Disease') :: ['ureteral obstruction'] @entity812 :: ('MESH:D021501', 'Disease') :: ['acute flank pain'] @entity13364 :: ('MESH:D053039', 'Disease') :: ['ureterolithiasis']
@entity812 :: (MESH:D021501,Disease) :: ['acute flank pain']
