title: Ureteropelvic junction obstruction in the neonate.
abstract: The widespread use of maternal ultrasonography has resulted in an increasing number of asymptomatic newborns being diagnosed with hydronephrosis. A total of 89 neonates with hydronephrosis secondary to ureteropelvic junction obstruction have been referred for evaluation and treatment during the last 6 years. In the majority the condition was diagnosed readily with ultrasonography, voiding cystography and excretory urography. Twenty-five per cent underwent more quantitative assessment using nuclear renal imaging. Only 2 patients (8 per cent) had a percutaneous study. Early reconstruction was performed in 75 per cent of the patients and it proved to be safe and effective. Twenty-three neonates were followed nonoperatively. One patient (4 per cent) demonstrated clinical deterioration necessitating later surgical intervention. Careful surveillance is mandatory in all infants followed nonoperatively.
mesh_terms: D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007231:Infant, Newborn; D007674:Kidney Diseases / Q000150:complications / Q000175:diagnosis / Q000601:surgery; D007682:Kidney Pelvis; D008297:Male; D011183:Postoperative Complications; D011296:Prenatal Diagnosis; D014463:Ultrasonography; D014517:Ureteral Obstruction / Q000150:complications / Q000175:diagnosis / Q000601:surgery*; D014567:Urography; D014718:Vesico-Ureteral Reflux / Q000209:etiology