Fifteen adults with obliterative bronchiolitis (OB) were investigated with computed tomography (CT). CT was considered to be abnormal in 13/15 patients (87%) showing widespread areas of increased attenuation of a patchy nature and variable proportion. CT revealed more extensive changes than the chest radiograph or bronchogram. It is a non-invasive well-tolerated and easily repeatable technique and may have an important role in the radiological evaluation of adults with OB.