Posterior urethral valve
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On the preliminary images there are two small calcifications projecting over the left renal shadow. The bladder is enlarged and trabeculated. The posterior urethra is markedly dilated with a possible shelf seen at the transition to non-dilated anterior urethra. No vesicoureteric reflux was seen.
These findings are consistent with posterior urethral valve (a.k.a. posterior obstructive congenital urethral membrane - POCUM).