We report a case of misdirection of a catheter for clean intermittent catheterization (CIC) into the ureter. A four-year-old girl with neurogenic bladder due to myelomeningocele had been managed with CIC by her parents for several years. From about a month before her visit, macroscopic hematuria appeared intermittently followed by abdominal pain and fever-up for a short time which ceased spontaneously. As cystography demonstrated bilateral vesicoureteral reflux, we performed endoscopic intraureteral injection of Deflux[TM] and during the operation we confirmed influx of bloody urine from the right ureteral orifice but not from the left one. As computed tomography revealed a tubular foreign body located in the upper portion of the right ureter, another endoscopic operation was performed and it was removed successfully. The removed foreign body was identified as a disposable catheter that was used for CIC.