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COMPARATIVE STUDY
JOURNAL ARTICLE
Bronchiolitis interstitial pneumonitis: a pathologic study of 31 lung biopsies with features intermediate between bronchiolitis obliterans organizing pneumonia and usual interstitial pneumonitis, with clinical correlation.
Annals of Diagnostic Pathology 2008 June
Bronchiolitis combined with interstitial pneumonitis generally has been equated with bronchiolitis obliterans organizing pneumonia (BOOP). We describe our experience with lung biopsies that had both bronchiolar and interstitial diseases. We studied 31 patients who had respiratory difficulty leading to open lung biopsy, which showed a combination of both prominent bronchiolitis and prominent interstitial pneumonitis. We compared these cases clinically and pathologically with 6 other pulmonary diseases, namely, bronchiolitis obliterans, BOOP, nonspecific interstitial pneumonitis, usual interstitial pneumonitis, airway-centered interstitial fibrosis, and idiopathic bronchiolocentric interstitial pneumonia, and with 10 cases of cystic fibrosis, an unrelated disease with both bronchiolar and interstitial pathology. The commonality of our cases was a combination of bronchiolitis and interstitial inflammation and fibrosis but little or no intra-alveolar organizing pneumonia. Bronchiolitis obliterans with organizing pneumonia involved less area than the interstitial pneumonitis in each case. All 19 patients for whom we had follow-up received corticosteroids for their pulmonary diseases. Seven patients had improvement in symptoms and pulmonary function test results and radiographic findings, 5 patients experienced subjective improvement with unchanged results of pulmonary function tests or chest x-ray, 1 patient's condition was unchanged, 6 patients' disease worsened, and 4 of these 6 died. The natural history of these cases, which we have designated bronchiolitis interstitial pneumonitis, seems more sanguine than usual interstitial pneumonitis and worse than BOOP at least in the short term. On the one hand, response to corticosteroids was not as frequent as generally accepted for BOOP. On the other hand, disease did not progress in most patients on corticosteroids.
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