Abstract Ureteropelvic junction obstruction is the most common cause of congenital hydronephrosis and typically presents with dilation of the renal pelvis and calyces without associated ureteral dilation. Although many cases are suspected prenatally as urinary tract dilation, definitive evaluation occurs postnatally through integration of US findings and functional assessment. US remains the primary imaging modality, with CT or MR urography used when additional anatomic detail is required, particularly to evaluate for extrinsic causes. Renal drainage and differential function are most assessed with mercaptoacetyltriglycine-3 diuretic renography. Management is individualized based on symptoms, severity of dilation, and renal function. While many children are managed conservatively, surgical pyeloplasty is indicated in patients with significant obstruction or declining function and is associated with favorable long-term outcomes.
Chamdi et al. (Mon,) studied this question.
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