SENSITIVITY OF NONCONTRAST HELICAL COMPUTERIZED TOMOGRAPHY AND PLAIN FILM RADIOGRAPHY COMPARED TO FLEXIBLE NEPHROSCOPY FOR DETECTING RESIDUAL FRAGMENTS AFTER PERCUTANEOUS NEPHROSTOLITHOTOMY

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Abstract
Conclusions Selective use of flexible nephroscopy after percutaneous nephrostolithotomy based on positive CT findings will avoid an unnecessary operation in 20% of patients. The rate of unnecessary procedures is 32% if all patients undergo flexible nephroscopy, regardless of radiographic findings. At our institution this strategy will result in a cost savings of $109,687 per 100 patients.