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Case 47 

Case 47
Case 47

Ellen Chung

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date: 17 January 2021

3-year-old with UTI.

Longitudinal ultrasound image shows a dilated, bulbous renal pelvis (P) and blunted calyces (arrowheads), but no dilated ureter. Normal-appearing renal parenchyma is noted.

Cystic masses originating from the kidney include ureteropelvic junction (UPJ) obstruction, multicystic dysplastic kidney (MCDK), and multilocular cystic renal tumor. The finding of renal parenchyma around the cyst excludes MCDK. The continuity of the cyst with the dilated intrarenal collecting system indicates the diagnosis of obstruction. The absence of a dilated ureter localizes the obstruction to the UPJ....

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