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A normal birth-weight, term, male baby with high APGAR scores fails to pass meconium within 36 hours of birth. The neonate also has a distended abdomen, has been vomiting, and has been feeding poorly. Digital rectal examination temporarily relieves the obstruction, but the baby fails to pass stool thereafter. Barium enema examination demonstrates a region of narrowed bowel. Which of the following is the most likely region affected?

A. Long segment extending from the splenic flexure into the rectum
B. Long segment involving the descending colon
C. Short segment involving the descending colon
D. Short segment involving the ileocecal valve
E. Short segment involving the rectum
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