目的:探讨肺结节周围血管集中征的 CT 表现及病理机制。材料和方法:对45例孤立性肺结节进行3mm 以下的薄层 CT 扫描,病灶局部放大并采用适当的窗宽、窗位技术。结果:显示肺血管集中征22例,其中良性结节2例,小肺癌20例。结论:肺血管集中征对诊断周围型小肺癌具有重要的临床价值,CT 薄层扫描有助于肺内良恶性病灶的诊断与鉴别诊断。 Objective: To investigate the CT manifestations and pathological mechanism of the vascular focus signs around pulmonary nodules. Materials and Methods: Forty-five solitary pulmonary nodules underwent thin-slice CT scans of 3 mm or less. The lesions were locally enlarged and appropriate window width and window level techniques were used. Results: 22 patients with pulmonary vascular signs were shown, including 2 with benign nodules and 20 with small lung cancer. Conclusion: Pulmonary vasoconstriction syndrome has important clinical value in the diagnosis of small peripheral lung cancer. CT thin-layer scan is helpful for the diagnosis and differential diagnosis of benign and malignant lung lesions.