Lane J I, Koeller K K, Atkinson J L
Department of Radiology, Naval Hospital, Oakland, CA 94627-5000, USA.
AJNR Am J Neuroradiol. 1995 Feb;16(2):269-73.
To determine whether radicular enhancement occurs in asymptomatic persons and, if so, to provide insight into the mechanism of such enhancement.
Thirty asymptomatic volunteers were studied with gadolinium-enhanced MR (0.1 mmol/kg) of the lumbar spine. The precontrast axial T1-weighted sequences were reviewed for the entry section phenomenon of flow-related enhancement. If present, the sequence was repeated in combination with a superior saturation pulse in an attempt to eliminate this phenomenon. All studies were reviewed to document the incidence of radicular enhancement and determine its association with the entry section phenomenon.
The entry section phenomenon was observed in 16 of 30 volunteers with successful elimination obtained in all cases. Eighteen of the volunteers demonstrated radicular enhancement; 16 of the 18 enhancing roots were associated with the entry section phenomenon.
Radicular enhancement occurs commonly in asymptomatic volunteers. This phenomenon most likely represents the enhancement of prominent radicular veins. We urge caution in interpreting this finding as abnormal in the symptomatic population with degenerative disk disease.
确定无症状者是否会出现神经根强化，若出现，则深入了解这种强化的机制。
对30名无症状志愿者进行腰椎钆增强磁共振成像（0.1 mmol/kg）检查。对对比剂注射前的轴向T1加权序列进行回顾，观察与血流相关强化的进入段现象。若存在该现象，则联合使用上饱和脉冲重复该序列，试图消除此现象。对所有研究进行回顾，记录神经根强化的发生率，并确定其与进入段现象的关联。
30名志愿者中有16名观察到进入段现象，所有病例均成功消除。18名志愿者出现神经根强化；18条强化神经根中有16条与进入段现象相关。
神经根强化在无症状志愿者中很常见。这种现象很可能代表突出的神经根静脉的强化。我们敦促在将这一发现解释为有症状的椎间盘退变人群中的异常情况时要谨慎。
