In general, lung involvement in connective tissue disorders has not been as well defined as
has isolated interstitial lung disease; this applies particularly to bronchiolitis, which occurs
infrequently. The low prevalence of bronchiolitis may reflect difficulties in making the
diagnosis in mild to moderate disease; at present, most reported disease is severe. This is
likely to account for the lack of therapeutic success in obliterative bronchiolitis and in many
patients with follicular bronchiolitis. There is a need for earlier intervention if treatment is to …