<prompt> Diamond sign is seen in-Congenital pyloric stenosisEsophageal atresiaIntestinal obstructionColon cancer  <response>: Ans. is a i.e., Congenital pyloric stenosiso Doubletriple track sign is seen in congenital hypertrophic pyloric stenosis.Barium study in CHPSElongation and narrowing of pyloric canal 2-4 cm lengthPassing of small barium streak through pyloric canal seen as a string of barium known as string sign.Crowding of muscle folds in pyloric canal known as doubletriple track sign.Transient triangular tent-like cleftniche in mid portion of pyloric canal with apex pointing interiorly; seen due to mucosal belonging between 2 separated hypertrophied muscle bundles on greater curvature side within pyloric canal, known as diamond sign twining recess.Outpouching along lesser curvature due to disruption of antral peristalsis, known as pyloric teatteat sign.Mass impression upon antrum with streak of barium pointing toward pyloric channel, known as beak sign antral beaking.Indentation of the base of duodenal bulb known as umbrellakirkinmushroom sign.Gastric hyperperistaltic waves known as caterpillar sign, a Single bubble sign.Shoulder sign : - Round indentation caused by very hypertrophied pyloric muscle. 