Local medical experts have found an explanation for the mechanism of a chronic disorder of the large airways.The discovery revealed the cause of tracheobronchopathia osteochondroplastica, which has been a mystery for 100 years, according to experts from the Shanghai 6th People's Hospital.TO is a benign disorder, which is usually misdiagnosed because of its unknown cause. The disorder can cause a narrow airway and even blockage if serious. It can also impact lung function.