Inadvertent ureteral catheterizaion with a microtip catheter at cystometry.

Two patients in whom the right ureter was inadvertently catheterized at water cystometry are described. Accidental ureteral catheterization and filling was followed by colicky pain in the right flank and by an abrupt increase in the recorded pressure, up to 148 cm H2O. The pain disappeared and the intravesical pressure returned to baseline after the microtip catheter was withdrawn.