Ultrasound in diagnosis of congenital hydronephrosis due to obstruction of pelviureteric junction.

The use of ultrasonography in the diagnosis of upper abdominal masses with nonfunctioning kidneys is described. Two cases of congential hydronephrosis due to obstruction of the pelviuretic junction are presented, both of which were diagnosed by B-scan ultrasound examination. Diagnostic ultrasound is a simple, noninvasive and reliable method of differentiating cystic from solid lesions and of assessing whether or not a mass is renal or extrarenal. It is recommended that all patients seen with an upper abdominal mass and/or nonfunctioning kidney be examined by ultrasound.