Mounier-Kuhn syndrome is a rare clinical entity. It was described in 1932 to refer to the presence of tracheobronchomegaly. The clinical presentation is variable and it can occur in several different age groups. We present the case of a young man who was admitted to the hospital for an asthma exacerbation and was found to have tracheobronchomegaly on his CT scan. A review of the literature for this rare, but interesting, phenomenon is included.