右肺奇静脉裂和奇叶形成CT及MRI表现

CT and MRI manifestations of right pulmonary azygos fissure and azygos lobe

目的:探讨右肺奇静脉裂并奇叶形成患者CT、MRI检查的影像学表现。方法:回顾性分析15例右肺奇静脉裂并奇叶形成的CT、MRI检查的影像学表现。结果:15例右肺奇静脉裂MRI及CT轴面平扫表现为略向外凸的一弧线状影,MRI信号强度高于肺实质,CT显示奇静脉裂宽度超过水平裂及斜裂,周围可见乏血管带;奇静脉弓位于奇静脉裂最下方,呈粗条状影,信号强度明显高于肺实质,矢状面显示该弧线凸面向上,从脊柱旁走向前胸壁;位于椎体、纵隔和奇静脉裂之间围成的三角形含气组织为奇叶。结论:右肺奇静脉裂并奇叶形成具有典型的MRI特征,MRI多方位成像对于该病有明确的诊断价值。

Objective：To study the CT and MRI manifestations of right pulmonary azygos fissure and azygos lobe. Methods The CT and MRI manifestations of 15 cases with right pulmonary azygos fissure and azygos lobe were retrospec tively analyzed. Results：Of the 15 cases with right pulmonary azygos fissure, the MRI and axial CT scan showed an curvilinear opacity projecting outwards and slightly convexly,the signal intensity was higher than that of pulmonary parenchyma. The width of azygos fissure displayed on CT exceeded that of horizontal and oblique fissure, with adjacent hypovascular zone. The arc of azygos vein located at the bottom of the azygos fissure showing as a broad stripe like opacity,the signal intensity was significantly higher than that of pulmonary parenchyma. On sagittal view the arc of azygos vein projected convexly and upwards from para-spinal area to anterior chest wall. The azygos lobe showed as an air-filled triangular area formed by vertebral body, mediastinum and azygos fissure. Conclusion： Typical characteristic findings of right pulmonary azygos fissure and azygos lobe could be revealed on MRI,multi planner images of MRI provided definite value in the diagno sis of this anomaly.