Primary Adenoid Cystic Carcinoma (Cylindroma) of the Trachea

Abstract
Two cases of adenoid cystic carcinoma of the trachea, and a review of the literature, are presented. This unusual and often undiagnosed tumor mimics asthma and chronic bronchitis. Although many patients die within 2-3 yr of the onset of symptoms without appropriate treatment, adequate therapy should lead to survival of 10 yr 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.

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