左肾静脉变异的多层螺旋CT诊断(附8例报告)

The diagnosis of viariation in left renal vein by MSCT(8 cases report)

目的：讨论多层螺旋CT（MSCT）及重建技术诊断左肾静脉变异的临床价值。方法：应用8层螺旋CT对8例患者行上腹部增强扫描，重建层厚2．5mm，间隔1．25mm，行多平面重组（MPR）、薄层最大密度投影（thin-MIP）及容积再现（VR），对左肾静脉进行二维及三维观察。结果：8例患者中，共发现腹主动脉后左肾静脉3例，腰静脉注入左肾静脉4例，双左肾静脉伴腰升静脉注入左肾静脉干1例。在重建技术中，thin-MIP显示左肾静脉操作简便，8例均显影清楚，VR显示3例，MPR只能节段显示左肾静脉。结论：MSCT结合thin-MIP后处理技术可以显示左肾静脉变异情况，图像清楚，诊断明确，能够为外科手术及血管造影术前提供重要的解剖学信息。

Objective：To discuss the clinical value of multislice spiral CT（MSCT） and reconstructure technique in diagnosing the variation of left renal vein（LRV）. Methods：Eight patients with variation of LRV were performed with CT scan, and reconstruction was established with slice thickness of 2.5mm and slice increment of 1.25mm. The data were postproeessed in workstation with multiple planar reformating（MPR）, thin maximum intensity projection（thin-MIP）and volume rendering（VR）. LRV were observed by two-dimensional and three-dimensional images. Results： Of the 8 cases, CT scan showed LRV after abdominal aorta （ n = 3） ,lumbar vein entering LRF （ n = 4）, two LRV and ascending lumbar vein entering LRV（ n = 1）. Of all post-processing techniques applied,thin-MIP was convenient in displaying LRV in 8 patients, VR showed the major anatomy of LRV in 3 patients, while MPR partially showed LRV. Conclusion：A combination of MSCT scan and thin-MIP can clearly display the variation of LRV, which may provide valuable anatomical information before surgical operation and angiography.