外源性变应性肺泡炎(Extrinsic allergic alveolitis)被认为是一种职业性或家庭环境性(Home environment)肺疾患。许多细小的有机粉尘,吸入肺泡后,引起过敏反应。在有喘息体质(Atopic)的人,可引起支气管哮喘,属Ⅰ型变态反应。在无喘息体质的人,可引起外源性变应性肺泡炎。其特点为肺泡壁及细支气管壁发生淋巴细胞浸润及结节病样肉芽肿,血清中出现特异性抗体——沉淀素,属Ⅲ型变态反应。二者区别详见表1。 Extrinsic allergic alveolitis is considered a type of occupational or home environment lung disorder. Many small organic dust, inhaled alveoli, causing allergic reactions. In patients with wheezing (Atopic), can cause bronchial asthma, is a type Ⅰ allergic reaction. In patients with wheezing, can cause extrinsic alveolitis. It is characterized by lymphocytic infiltration of bronchial alveolar wall and bronchial wall and nodosa-like granuloma, serum specific antibody - precipitin, is a type Ⅲ allergic reaction. The difference between the two is shown in Table 1.