目的 提高对外源性过敏性肺泡炎的认识。 方法 回顾分析2011年10月报道1例外源性过敏性肺泡炎（过敏性肺炎）患者的诊断及治疗经过，总结其临床特征、诊疗要点及预后评价。 结果 患者数次误诊后最终诊断为外源性过敏性肺泡炎，予脱离变应原及激素治疗后痊愈，随访半年无复发。结论 该病临床表现无特异性，需结合患者病史、临床症状、血清学检查、影像学表现，甚至肺泡灌洗液及肺活检综合判断；脱离变应原为该病治疗的最根本、最重要措施；对于病情严重患者，短期全身性使用糖皮质激素可缩短病程或改善症状。
Extrinsic allergic alveolitis is a general term for type Ⅲ or Ⅳ allergic pneumonia caused by repeated inhalation of various antigenic organic dusts and low molecular weight chemicals in susceptible people. The lesions involve alveolar, pulmonary interstitial, and airway. The main clinical manifestations are cough, expectoration, and dyspnea. Clinically, extrinsic allergic alveolitis is classified into acute, subacute, and chronic forms. Extrinsic allergic alveolitis has a great impact on the pulmonary function of patients. Timely treatment will improve clinical symptoms and inhibit the development of disease. The current treatment plan is mainly avoiding exposure to antigen, glucocorticoid therapy, immunosuppressive therapy, anti-fibrotic therapy, and lung transplantation.