目的 :确定孤立肺结节和原发肺外肿瘤的患者单个肺转移、原发性肺癌和良性病变的发生率。材料和方法 :作者评估了 1 4 9例有肺外恶性肿瘤和孤立肺结节的患者的电子图表。结节的组织学特性与肺外肿瘤、患者的年龄及吸烟史相关。结果 :患有头颈部、膀胱、乳腺、宫颈、胆管、食管 PURPOSE: To determine the incidence of single lung metastases, primary lung cancers, and benign lesions in patients with isolated pulmonary nodules and primary extrapulmonary tumors. Materials and Methods: The authors assessed the electronic charts of 1,499 patients with extrapulmonary malignancies and isolated pulmonary nodules. The histological features of the nodules are related to extrapulmonary tumors, patient’s age and smoking history. Results: With head and neck, bladder, breast, cervix, bile duct, esophagus