<prompt> Which among the following is not a ultrasound feature of Congenital Hyperophic Pyloric Stenosis?95 sensitivity by ultrasoundThickness of pylorus 4mmCanal length 16mmHigh gastric residue  <response>: Ans is d i.e. High gastric residue Ultrasound is the investigation of choice. It can diagnose HPS accurately in 95 of patients. Criteria for ultrasound diagnosis of HPS: a. channel length of 16mm b. pyloric thickness of 4mm The diagnosis of pyloric stenosis usually can be made on physical examination by palpation of the typical olive in the right upper quadrant and the presence of visible gastric waves on the abdomen. When the olive cannot be palpated, ultrasonography can diagnose the condition accurately in 95 of patients. Criteria for ultrasonographic diagnosis include a channel length of 16 mm and pyloric thickness of 4 mm. - Schwaz 