What are the possible causes of acquired tracheomalacia (not congenital) in toddler? vascular rings have been ruled out via ct scan & bronchoscopy.

Other studies: Here are some other studies that are sometimes done to investigate the cause tracheomalacia: airway fluoroscopy, barium swallow, pulmonary function tests I'm assuming the child has never been intubated ( breathing tube) or had surgery in the area ( both can cause acquired tracheomalacia). Sounds like your child is already seeing a pulmonoogist or ENT. That's who I would refer to.