Nonobstructive urinary tract dilatation in children with diabetes insipidus.

We report 4 boys with diabetes insipidus associated with renal impairment and hydroureteronephrosis. The high flow states caused the bladder to become trabeculated in the absence of infravesical obstruction. Urodynamics have shown the bladder itself to be compliant, but drainage is poor leading to further renal impairment and overflow incontinence. All 4 boys have been managed with cystostomy button drainage and have done well on close follow-up.