Coexistence of lung alveolar adenoma with bronchogenic cyst: a case report and literature review

Alveolar adenoma (AA) is extremely rare benign tumor of the lung. This tumor is comprised of proliferative type II alveolar epithelium and septal mesenchyma and shows characterized immunohistochemical patterns. Up to date, there have been only few reports describing this disease. Here we described a case of alveolar adenoma in a 48-year-old woman. This female patient was incidentally found to have a left lower lobe mass by the chest CT scan and went through a left lower lobectomy. A nodule were observed and the pathological and immunohistochemical examinations of the surgically resected nodule revealed this lesion to be an alveolar adenoma. In addition, an isolated bronchogenic cyst was also observed. The postoperative course was uneventful and no recurrence was observed after 5 years. In conclusion, we reported the rare disease of Alveolar adenoma coexisting with bronchogenic cyst. Besides, we also gave a literature review of previously published papers describing alveolar adenoma.