| Summary: | Cases of nonobstructive dilation of the upper urinary tract subsequently becoming obstructive are rare. We report a case involving a male child approximately 2.5 years old (29 months) who presented with an obstruction of the ureterovesical junction, which had been diagnosed and treated for nonobstructive dilation at another hospital 15 months earlier. At our hospital, we found no ureteral orifice by cystoscopic examination. Exploratory surgery was performed and complete obstruction of the ureterovesical junction was observed. We resected the segment involved in the obstruction and performed an ureteroneocystostomy. Patients found to have nonobstructive dilation of the urinary tract, a common and often innocuous finding, need careful follow-up to ensure that obstructions that may develop later can be treated in a timely manner.
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