This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Fluid levels are not visible in 
Select and explain. 
A. Meconeum ileus, B. Intussusception, C. Colon pouch, D. Duodenal obstruction
A: Meconeum ileus
Answer: A: Meconeum ileus 
Explanation: In meconium ileus meconium is so thick that it is unable to form air-fluid level despite complete small intestinal obstruction (Note the multiple air-fluid level is a feature of mechanical small bowel obstruction & paralytic ileus).