School ager with left flank pain who underwent a Deflux injection at the left ureterovesical junction 3 days ago and now has decreased urine output

US of acute ureteral obstruction after Deflux injection
Sagittal US of the right kidney (above left) was normal. Sagittal US of the left kidney (above right) showed new moderate hydronephrosis. Transverse US of the bladder (below left) showed a normal right ureteral jet. Transverse US of the bladder (below right) shows an oval echogenic structure near the left ureterovesical junction at the base of the bladder and a left ureteral jet which is markedly less than its counterpart on the right.

The diagnosis was left acute ureteral obstruction after Deflux injection for left vesicoureteral reflux.