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134959 Surgery

A three year old male child presents with history of constipation and abdominal distension for the last two years. The plain radiograph of abdomen reveals fecal matter containing distended bowel loops. A barium enema study done subsequently shows a transition zone at the recto-sigmoid junction with reversal of recto-sigmoid ratio. The most probable diagnosis is;

AAnal atresia
BMalrotation of the gut
CHirschsprung's disease
DCongenital megacolon
Surgery
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