Tracheal obstruction presenting as new-onset wheezing.

Two cases of recent-onset dyspnea and wheezing initially treated with bronchodilator therapy for presumed reactive airway disease are presented. Plain-film chest radiographs subsequently demonstrated mediastinal masses causing extrinsic tracheal compression. The first patient had inoperable poorly differentiated squamous cell carcinoma resistant to radiotherapy. The second patient underwent resection of a substernal multinodular goiter with complete resolution of symptoms. The physician should always entertain the diagnosis of upper airway obstruction in all adult patients with new-onset wheezing. New-onset adult wheezing of uncertain etiology should prompt the physician to refer the patient for pulmonary function testing with flow-volume loops.