[An unusual association: tracheobronchomegaly with a normal pulmonary function test].

Tracheobronchomegaly is a rare condition characterised by marked dilation of the trachea and the main bronchi. The clinical presentation of this disease is nonspecific and the diagnosis is based on the radiological features, especially computed tomography of chest. Pulmonary function tests are often abnormal showing airflow limitation with increased residual volume. The authors report a rare case of a 31-year-old man presenting tracheobronchomegaly is normal pulmonary function test.