Primary adenoid cystic carcinoma (cylindroma) of the trachea.

Two cases of adenoid cystic carcinoma of the trachea, and a review of the literature, are presented. This unusual and often undiagnosed tumor closely mimics asthma and chronic bronchitis. Although many patients die within 2 to 3 years of the onset of symptoms without appropriate treatment, adequate therapy should lead to survival of 10 years or more. The radiologist should make the initial diagnosis by noting the tumor, which is frequently located posterolaterally and in the middle third of the trachea.