(Fr: bronchiolite oblitérante). Pattern distinct from BOOP or AFOP (See section I). It is suspected when airflow obstruction is noted in the context of normal or hyperlucent lungs on chest radiographs and a mosaic or (less often) a tree-in-bud pattern on HRCT studies. HSCT and lung transplant recipients and victims of exposure to noxious gases including chlorine are prone to the development of this complicaton. PMID 20371529, 20441501, 20477273. See under pathology, as bronchiolitis is as the name implies a designation used in pathology