One year old male child presented with poor urinary stream since bih. The investigation of choice for evaluation is -

Ans. is 'a' i.e., Voiding cystourethrography o Poor urinary stream since bih suggests urinary tract obstruction (usually infravesical). o Most common cause of urinary tract obstruction in a male child is posterior urethral valve. o And the best diagnostic method for posterior urethral valve is voiding cystourethrogram.