outer upper quadrant ; right upper quadrant
左外上象限 LUOQ
右外上象限 RUOQ
结论颈椎侧块外上象限是螺钉植入的安全区，横突与关节突相交处是安全的出钉点。
Conclusion the superior lateral quadrant was the safe area of the cervical lateral mass screw. The safe exit point was the juncture between the transverse process and the facet.
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