A comparison of bronchiolitis obliterans with organizing pneumonia, usual interstitial pneumonia, and small airways disease.

This report is based on 43 cases where a diagnosis of either bronchiolitis obliterans with organizing pneumonia (BOOP), usual interstitial pneumonia (UIP), or small airways disease (SAD) was established by lung biopsy. The severity of histologic abnormalities in the peripheral airways and interstitial spaces were measured on these biopsies using semiquantitative techniques and compared with the clinical data available in 42 of 43 cases,...