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Tracheobronchomegaly or Mounier-Kuhn syndrome is a rare disorder characterized by the widening of the trachea and the main bronchi. It is a form of tracheomalacia called ‘cartilaginous malacic’ and is characterized by deformation of the tracheal cartilages and intrusion of the redundant membranous wall into the lumen of the airway. We present a patient with Mounier-Kuhn syndrome managed like patients with tracheomalacia of other aetiologies—a tracheobronchoplasty with a reconstructed D-shaped trachea and stabilization of the posterior membranous wall by attaching a polypropylene mesh to the posterior membranous wall of the trachea and the main bronchi after a trial period with a tracheobronchial Y-shaped silicone stent.