[Report of 2 cases of extrinsic allergic alveolitis and review of relevant literature].

Two cases of extrinsic allergic alveolitis were reported. The antigens inducing the immunologic events are wheat powder, hair-dye liquid. The pathology, symptoms and chest radiograph features were presented. The best treatment is avoidance of antigen exposure and to use of corticosteroids. The chronic form of the disease often leads to irreversible pulmonary interstitial fibrosis.