Hashimoto M, Watanabe O, Hirano H
Department of Radiology, Yamamoto General Hospital, Akita, Japan.
Acta Radiol. 1996 Sep;37(5):610-3. doi: 10.1177/02841851960373P238.
To review experience with MR images of extraforaminal (EF) stenosis in the lumbosacral spine.
MR images from 9 patients with 10 EF stenoses were reviewed. The diagnosis was confirmed in 6 patients at surgery, and in 4 on the basis of findings of nerve root injection combined with nerve block.
All patients had congenital lumbosacral anomalies with various degrees of fixation between the last formed level and the pelvis. In all cases, affected roots were compressed between the transverse process of the last lumbar segment and the sacral ala. MR using coronal plane imaging demonstrated the root impingement directly in the far lateral zone in all patients. However, sagittal and axial images were unable to define the EF stenoses in all patients. The results of this study show that a transitional vertebra is a cause of EF stenosis and that MR images using coronal plane are useful in the assessment of EF stenosis.
回顾腰骶部椎间孔外（EF）狭窄的磁共振成像（MR）经验。
回顾了9例患者10处EF狭窄的MR图像。6例患者经手术确诊，4例根据神经根注射联合神经阻滞的结果确诊。
所有患者均有先天性腰骶部异常，最后形成节段与骨盆之间存在不同程度的固定。所有病例中，受累神经根均被最后一个腰椎节段的横突与骶骨翼挤压。使用冠状面成像的MR在所有患者中均直接显示了远外侧区的神经根受压情况。然而，矢状面和轴位图像无法在所有患者中明确EF狭窄。本研究结果表明，移行椎是EF狭窄的一个原因，使用冠状面的MR图像在评估EF狭窄方面很有用。
