title: Intermittent hydronephrosis: a diagnostic challenge.
abstract: Intermittent hydronephrosis is a difficult condition to diagnose because of the mild degree of dilatation encountered in imaging studies. The condition nevertheless is disabling and attempts to reach a precise diagnosis include diuretic excretory urography, ultrasonography and renal scans. The delayed double-peak pattern seen on 99mtechnetium-diethylenetriaminepentaacetic acid diuretic renography shows how the ureteropelvic junction can become self-obstructing with forced diuresis. All patients who exhibited this sign eventually had frank obstruction and most exhibited an extrinsic component to the obstruction. The recognition of the double-peak pattern may become a useful adjunct in the early diagnosis of intermittent hydronephrosis.
mesh_terms: D000293:Adolescent; D002648:Child; D004232:Diuretics; D005260:Female; D006801:Humans; D006869:Hydronephrosis / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000601:surgery; D007668:Kidney / Q000000981:diagnostic imaging; D007682:Kidney Pelvis / Q000601:surgery; D008297:Male; D009942:Organometallic Compounds; D004369:Pentetic Acid; D011866:Radioisotope Renography; D016284:Technetium Tc 99m Pentetate; D013997:Time Factors
chemical_list: D004232:Diuretics; D009942:Organometallic Compounds; D004369:Pentetic Acid; D016284:Technetium Tc 99m Pentetate