Study Design. To report a new index, the K-line, for deciding the surgical approach for cervical ossification of the posterior longitudinal ligament (OPLL).
研究目的：证实k线作为颈椎后纵韧带骨化手术入路的新标准。
Traditional craniotomy including pterional approach, subfrontal approach and longitudinal fissure approach was performed in the other patients.
其余均采用传统开颅手术，如翼点入路，额下入路、纵裂入路等。
ObjectiveTo analyse and explore microsurgery skill and clinical effects of Surgical case study in A2 anterior cerebral artery aneurysms with longitudinal fissure approach.
目的：探讨纵裂入路开颅大脑前动脉a 2段动脉瘤夹闭术显微外科治疗技巧及其临床效果。
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