<prompt> Fluid levels are not visible in -Meconeum ileusIntussusceptionColon pouchDuodenal obstruction  <response>: Answer is a i.e. Meconeum ileus In meconium ileus meconium is so thick that it is unable to form air-fluid level desptie complete small intestinal obstruction Note the multiple air-fluid level is a feature of mechanical small bowel obstruction paralytic ileus. 