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B The ultrasound findings are suggestive but not definitive. In a stable infant with an equivocal ultrasound, an immediate UGI contrast study is appropriate to assess for malrotation and midgut volvulus. Reversal of the mesenteric vessels alone does not establish the diagnosis.If ultrasound...

A Studies of referred or transferred neonates have reported surgical diagnoses in 46%of cases. Causes include intestinal atresia, malrotation with or without volvulus, and Hirschsprung disease. Urgent assessment is necessary because volvulus can rapidly compromise intestinal blood supply.

C This provides glucose and chloride while correcting dehydration and hypochloraemic metabolic alkalosis. Potassium should be added only after adequate urine output is established, which has not yet been demonstrated in this infant.

Persistent proximal duodenal dilatation following duodenal atresia repair may reflect megaduodenum with impaired motility or a mechanical obstruction, such as an anastomotic narrowing. A UGI study with small bowel follow-through evaluates the postoperative anatomy, passage through the...

D

c