81 ANTEGRADE PYELOGRAPHY VERSUS UNENHANCED MULTIDETECTOR CT (UMDCT), IN THE ASSESSMENT OF URINARY TRACT STONES FOLLOWING PERCUTANEOUS NEPHROSTOMY INSERTION -A PROSPECTIVE BLINDED STUDY

Background and Purpose: In patients with a percutaneous nephrostomy tube (PCN) inserted for symptomatic stone disease, antegrade pyelography is an accepted modality to assess the collecting system and residual stone status prior to PCN removal. Recently, unenhanced multidetector CT (UMDCT) has shown its superiority for the assessment of urinary-tract stones. Comparison of UMDCT with antegrade pyelography has never been done; hence, our aim was to compare the two methods for the assessment of urinary stones in patients with a PCN. Patients and Methods: Between July 2004 and July 2005, we prospectively imaged 49 consecutive patients with known urinary-tract stone disease who had PCN (27 men and 22 women; average age 57 ± 20 years; range 4–88 years). All patients underwent UMDCT and antegrade pyelography within 24 hours. Both examinations were prospectively and blindly evaluated by two attending radiologists for the presence, location, and size of urinary-tract stones. Results: According to the findings of b...