Abstract: From August 2010 to August 2020, there were 3 cases of pathologically diagnosed alveolar adenoma (AA) were reported in Peking Union Medical College Hospital so far, which was a rare benign neoplasm of the lung. The clinical manifestations and radiological characteristics on computer tomography of AA were heterogenous among these patients and lacked specificities. The difficulty in predictive differentiation of benign or malignant characteristic of the lesion led to some confusions in clinical practices. This paper reported 2 cases of AA and reviewed the literature of AA. Its clinical, radiographical and pathological characters were analyzed, so to provide more knowledge and improve the differential diagnosis of this disease.

Key words: alveolar adenoma, benign neoplasm of the lung