<prompt> Investigation of choice for CHPSUSGx-rayCTMRI  <response>: Ans. a USGRef: Bailey and Love page 113-11426th edition IOC for Congenital Hypertrophic Pyloric stenosis - USG Palpated as a Olive tumor in right Upper quadrant. If the history and clinical mass is there - no need of USG - directly we can do Ramstedts pylromyotomy 