Mounier-Kuhn syndrome is a rare syndrome characterized by tracheobronchomegaly resulting from the loss or atrophy of musculo-elastic fibers within the trachea and main bronchi wall. This syndrome is more common in the third or fourth decades of life. The diagnosis can usually be made by measuring the diameters of trachea and main bronchi radiologically. A 52-year-old male patient was referred to our outpatient clinic with chronic productive cough and recurrent respiratory tract infections. We detected tracheobronchomegaly, tracheal diverticula, and bronchiectasis in the chest CT scans. This rare case is presented due to later onset than expected and very demonstrative radiological findings.