Answer:

Explanation
1. Dilated bowel loops proximal to the site of obstruction are a hallmark finding in ileal atresia. (Dilated air filled loops of small bowel are noted as well, consistent with small bowel obstruction.)

2. Abdominal calcifications will be seen in the setting of ileal atresia with perforation and meconium peritonitis.  (Meconium peritonitis may be diagnosed prenatally by the presence of peritoneal fluid collections, which can loculate and calcify (4).)

3. Meconium pseudocyst may be seen in ileal atresia with perforation and resultant meconium peritonitis that loculates into a fluid collection. (The constellation of a perihepatic collection and dilated bowel loops suggested the diagnosis of ileal atresia with perforation.)

4. Microcolon, rather than distension of the colon is seen in the case of ileal obstruction because of proximal blockage at the atretic site.  (Contrast enema demonstrates a normal sized rectum but microcolon of the sigmoid and remaining colon.)

5. Microcolon is seen in ileal atresia because of functional disuse of the colon distal to the site of obstruction.  (The dilated bowel loops are present proximal to the atretic site and microcolon is often noted distal to the site of obstruction.)