肺癌幕下脑转移瘤与血供关系的研究

目的：研究肺癌幕下脑转移瘤的MRI分布特征与血供的相关性。材料和方法：搜集经病理或临床证实的肿瘤幕下脑转移MRI资料20例，以脑血供解剖范围为基础，从断层像上观察确定瘤灶在幕下小脑和脑干对应脑血供区分布的规律性。结果：20例肺癌中，11例为病理证实，4例为非小细胞肺癌，7例为小细胞肺癌；9例为临床诊治过程证实。20例肺癌幕下脑转移瘤单发7例，多发13例，共有55个瘤灶，即小脑半球47个，脑干4个，小脑上蚓部3个．小脑下蚓部1个，行分属于小脑上动脉供血区13个(23．6％)，小脑前下动脉供血区20个(36．4％)，小脑后下动脉供血区16个(29．1％)．基底动脉脑干分支供血区4个(7．3％)，小脑动脉均有的混合供血区2个(3．6％)。20例中伴幕上多发转移瘤15例(75.0％)。结沦：肺癌单独幕下脑转移瘤较少，多伴有幕上多发脑转移；幕下脑转移以小脑半球多见，依次分布于小脑前下和后下动脉以及小脑上动脉供血区，但三者之间无统计学差别。研究表明幕下瘤灶分布与脑血供有一定相关性。

Study of Relation between MRI Findings of Infratentorial Metastasis of Lung Cancer and Its Blood Distribution

Objective:To study the characters and relationship between MRI findings of infratentorial metastasis from lung cancer and its blood distribution. Materials and methods:Twenty cases with pathologically-proved and clinically-proved infratentorial metastasis of lung cancer on plain and GD-DTPA enhanced MR scanning, according to the transvers imaging, to study the location of metastatic foci on the basis of its blood distribution. Results:Twenty cases have 55 metastatic foci, 13 foci occurred at the area supplied blood by cerebri superior artery, 20 foci occurred at the area supplied by cerebellaris inferior anterior artery, 16 foci occurred at the area supplied by cerebellaris inferior posterior artery, 51 foci occurred at the area supplied by cerebral artery and 4 foci occurred at the area supplied by points artery of basilaris artery. But also 15 cases also have mutiple supratentorial metastasis. Conclusion:Metastatic foci of infratentorium tumor often occurred at the areas supplied by cerebellaris inferior posterior artery?cerebellaris inferior artery and cerebri superior artery. The locations of foci at the areas supplied by cerebellaris inferior posterior artery?cerebellaris inferior inferior artery and cerebri superior artery were had no significant difference. Infratentorial metastasis of lung cancer often had multiple supratentorial metastasis spontaneously. The location of metastatic foci of infratentorium had relationshiop to the cerebral blood distribution.