<prompt> Which of the following is the investigation of choice for assessment of depth of penetration and perirectal nodes in rectal cancer?Trans rectal ultrasoundCT scanDouble contrast barium enemaMRI scan  <response>: Ans. d MRI ScanRef: Sabiston 19th Edition, Pages 1357-1358 Endo rectal MRI is the standard investigation to do T and N staging of cancer rectum Its also good for overall staging Even endorectal MRI is replaced now by surface coil MRI 