Undiagnosed tracheomalacia accompanied with accidental expiratory central airway collapse after tracheal intubation.

Background: A patient with undiagnosed tracheomalacia undergoing surgery experienced accidental expiratory central airway collapse after tracheal intubation. Here, we aimed to diagnose tracheomalacia from the preoperative data.

Case Presentation: A 73-year-old man, scheduled for abdominal surgery, had a clinical history of chronic obstructive pulmonary disease.