This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal Radiology, Subject name: Radiology
Diamond sign is seen in 
Select and explain. 
A. Zenker's diveiculum, B. Morgagni hernia, C. CHPS, D. Bochdalek hernia
C: CHPS
Answer: C: CHPS 
Explanation: "Diamond"sign is a transient triangular tent-like cleft/niche in the middle of the pyloric canal, Seen in case of Congenital Hyperophic Pyloric Stenosis . Congenital hyperophic pyloric stenosis :- - usually presents around 3-12 weeks of age; as non bilious vomiting in a 1st born male - IXOC - USG - On USG appears as - target sign /cervix sign/antral nipple sign Other signs seen in CHPS :- - string sign - diamond sign - mushroom sign