Benign nontuberculous bronchostenosis is a complication of either intrinsic or extrinsic asthma that too often is unrecognized. By bronchostenosis is meant a definite stricture-like narrowing of a bronchus that is considered to be inflammatory in nature and not the result of allergic edema or spasm. In 1939, two of us (L. E. P. and H. J. M. )1described the symptoms, physical findings, and the laboratory information that characterize bronchostenosis in asthma, and, in 1940,2we reviewed our experience at the Mayo Clinic with 140 patients with asthma who had been especially selected for bronchoscopic examination. Of this series, 60 patients were found to have definite stenosis of one or more bronchi. Subsequently, others3have reported their experiences with this complication of asthma. Recently we reviewed the records of 1,034 consecutive asthmatic patients who underwent bronchoscopic examination during the decade ending in 1950. Of these, 327 were found