A patient with gross hematuria after blunt abdominal trauma has a normal appearing cystogram after the intravesical instillation of 400 ml of contrast. You should next order:
A . A retrograde urethrogram.
B . A voiding cystourethrogram.
C . A cystogram obtained after filling, until a detrusor response occurs
D . An intravenous pyelogram.
Answer: A