大前庭水管综合征CT和MRI的应用价值

Value of CT and Magnetic Resonance Imaging in the Diagnosis of Large Vestibular Aqueduct Syndrome

目的:探讨CT和MRI在诊断大前庭水管综合征(LVAS)中的应用价值。方法:10例LVAS患者行CT和MRI检查,在CT多平面重组(MPR)图像上分别测量前庭水管(VA)中点最宽径及外口直径,并应用容积再现(VR)技术进行三维重组;MRI检查均使用3D-FIESTA序列,在MPR图像上分别测量内淋巴囊(ES)骨内部分中点最宽径及外口直径,并应用VR三维重组技术。2组中点最宽径及外口直径分别行相关性检验和配对t检验。结果:10例LVAS患者CT均显示双侧扩大的VA,MRI显示双侧扩大的ES。CT测得VA中点及外口平均直径分别为1.935和2.935 mm,MRI相应测量值为1.880和3.115mm.2组的这2项测量结果均具有相关性(P<0.05)。VR图像能立体直观地显示扩大的VA及ES。结论:CT和MRI检查均可以正确诊断LVAS,MPR及VR重组图像可清晰地显示扩大的VA和ES。

Objective：To evaluate the value of CT and magnetic resonance imaging （MRI） in the diagnosis of large vestibular aqueduct syndrome （I.VAS）. Methods：CT and MRI were performed on 10 cases with LVAS. The largest diameter of the midpoint of vestibular aqueduct （VA） and the external aperture were measured respectively on the multi-planar reformation （MPR） images of CT and volume rendering （VR） technique was used for three-dimension reformation. 3D-FIESTA sequence was used on MRI.the largest diameter of midpoint and external aperture of the bony part of endolymphatic sac （ES） were measured on MPR images and VR technique was used as well. The data obtained by CT and MRI were statistically analyzed by correlation test and t test. Results： Bilateral enlargement of VA was showed on CT as well as bilateral enlargement of ES was showed on MRI in all of these 10 patients. The mean diameter of the midpoint of VA and external aperture measured with CT were 1. 935mm and 2. 935mm respectively, which were 1. 880mm and 3. 115mm respectively with MRI. Correlation was existed between the measured results by the two modalities （P〈0.05）. Enlargement of VA and ES could be displayed objectively and 3-dimensionally by VR technique. Conclusion： Accurate diagnosis of I,VAS could be made both on CT and MRI, MPP, and VR could clearly display the enlarged VA and ES.