case_images: PMC8580735_01
case_images: (
  A, B
  ) Anal canal duplication, communicating with the native anus. (
  C
  ) Hemisacrum demonstrated on anteroposterior pelvic X-ray. (
  D
  ) Abdominopelvic MRI showing a presacral mass on sagittal view.
case_images: 10-1055-s-0041-1735595-i210591-1.jpg
case_images: PMC8580735_01_10-1055-s-0041-1735595-i210591-1.jpg
case_images: FI210591-1
case_images: A female patient presents with a perineal finding, which we suspected was a posterior anal duplication ( Fig. 1A, B ). When probed ( Fig. 1B ), it appeared to be communicating with anal canal distal to the dentate line and just proximal to the anal verge. Plain film anteroposterior pelvic X-ray shows a sacral abnormality ( Fig. 1C ). A magnetic resonance imaging (MRI) of the pelvis demonstrated a presacral mass consistent with an anterior meningocele and a conus at L2 but without spinal cord tethering ( Fig. 1D ).