Department of Radiology, Maltepe University, Turkey.
Neurol India. 2020 Nov-Dec;68(6):1367-1373. doi: 10.4103/0028-3886.304115.
To retrospectively analyze hydrocephalus and lateral ventricular asymmetry by measuring the midline shift, Evans index, right and left semi-Evans index, Right and left semi-callosal angles, superior ophthalmic vein (SOV) diameters, and to compare these findings with the control group.
The study included 93 cases with hydrocephalus, 80 cases with asymmetrical lateral ventricles (ALV) and 83 control cases with normal findings who had cranial magnetic resonance imaging (MRI) in our institute between the years 2011 and 2016. A senior and junior radiologist analyzed the images and performed the measurements, and the results were compared.
The cut-off points for the Evans index and right and left semi-Evans indexes for differentiating hydrocephalus and ALV were calculated as 28.68%, 30.77%, and 30.88%, respectively. The septum shift degree was significantly higher in the ALV group compared to the control group (P = 0.010; P < 0.05). ALV or hydrocephalus were not found to be associated with SOV enlargement. The SOVs were not found to be enlarged ipsilateral to asymmetrically enlarged lateral ventricle.
Lower Evans and right and left semi-Evans indices are seen in ALV. Despite some limitations, the Evans index could still be used to differentiate hydrocephalus and ALV. Mild ALV is mostly associated with an off-midline septum. SOV diameter and enlargement are not indicators of hydrocephalus or ALV.
通过测量中线移位、Evans 指数、右侧和左侧半 Evans 指数、右侧和左侧半胼胝体角、上矢状窦（SOV）直径，回顾性分析脑积水和侧脑室不对称，并将这些发现与对照组进行比较。
本研究纳入了 2011 年至 2016 年在我院行头颅磁共振成像（MRI）检查的 93 例脑积水患者、80 例侧脑室不对称（ALV）患者和 83 例正常对照组患者。由一名高年资和一名低年资放射科医生对图像进行分析和测量，并对结果进行比较。
计算出区分脑积水和 ALV 的 Evans 指数和右侧及左侧半 Evans 指数的截断值分别为 28.68%、30.77%和 30.88%。ALV 组的隔移位程度明显高于对照组（P = 0.010；P < 0.05）。未发现 SOV 增大与 ALV 或脑积水有关。也未发现 SOV 同侧增大与不对称性侧脑室增大有关。
ALV 的 Evans 指数和右侧及左侧半 Evans 指数较低。尽管存在一些局限性，但 Evans 指数仍可用于区分脑积水和 ALV。轻度 ALV 主要与隔中线偏移有关。SOV 直径和增大不是脑积水或 ALV 的指标。
