肺癌侵犯左心房的MRI表现及病理解剖基础

MRI Appearance of the Invasion of Left Atrium by Lung Cancer and Its Pathologic Basis

目的：探讨肺癌侵犯左心房（ILA）的MRI特点及其病理解剖基础，为肺癌ILA的MRI诊断提供依据。材料与方法：回顾性分析病理证实的13例肺癌ILA的MRI表现及相关的手术病理资料，盲法判断MRI征象并与手术病理对照，结果：肺癌ILA的MRI表现有：（1）左房壁信号异常，腔内结节或肿块（房壁异常）。（2）肿块包埋肺静脉干，其管院狭窄或闭塞（肺静脉干异常）。（3）肿块与左房间的高信号脂肪线消失（房周脂肪异常）。结论：房壁异常、肺静脉干异常及房周脂肪异常都是MRI诊断肺癌ILA有价值的征象。

Objective: To study the MR imaging features of invasion of the left atrium (ILA) by lung cancer and its pathologic basis. Materials and Methods: The MRI findings with related surgical and pathological data in 13 cases, the neoplastic invation of the left atrium which was surgicopathologically proven, were retrospectively analyzed. The MRI findings were blindliy analyzed and compared with the surgical and pathological appearances. Results:The MRI manifestations of ILA by lung cancer include: (1 )Abnormalisties in signal intensity of the left atrial wall, intracavitary nodular or mass (abnormalities of left atrial wall); (2)The pulmonary venous trank (PVT) was encased by mass becoming narrowed or obliterated (abnormalities of PVT); (3 )The high signal intensity of fat between mass and left atrium were disappearred (abnormalities of periatrial fat). Conclusion: Sign as abnormalities of left atrial wall, abnormalities of PVT and abnormalities of periatrial fat, are useful in diagnosis of ILA by lung cancer on MR imaging.