<prompt> Which of the following is not an appropriate investigation for anterior urethral stricture -High frequency ultrasoundMicturating cystourethrogramRetrograde urethrogramMagnetic Resonance Imaging  <response>: Radiological studies in urethral stricture -- 1 Retrograde urethrography - It is the mainstay of radiographic investigation of stricture disease 2 Voiding cystourethrogram Maturating cystourethrogram MCU demonstrates the segment of urethra proximal to the stricture. 3 Endoscopy Retrograde urethroscopy Antegrade cystrourethroscopy 4 Sonographic urethrogram MRI has no role in the diagnosis of urethral strictures. 