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Parents in a small town in Assam bring their 9-month-old son to the paediatric surgery OPD. Since morning he has had sudden episodes of inconsolable crying with pallor and drawing up of the knees, then lies quiet; he has vomited twice and passed a jelly-like red stool. A sausage-shaped lump is palpable under the right costal margin. What is the investigation of choice?
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