Fig. 2 | Scientific Reports

Fig. 2

From: Application of 3D Slicer for preoperative planning in upper cervical posterior fixation with vertebral artery variations

Fig. 2

Normal vertebral artery: Pedicle screws for both C1 and C2. A patient with wide and high of axial vertebral artery foramen underwent atlantoaxial pedicle screw fixation due to odontoid fracture (Anderson II). (A) measurement of value-e, e < 4.5 mm; (B) measurement of value-a, a > 4.5 mm; (C,F) preoperative X-ray; (D,G) postoperative X-rays; (E,H) postoperative CT image. (Value a: the length from the entrance of the vertebral artery of the axis to the inner wall of the spinal canal; Value e: the length from the apex of the bulb of the vertebral artery to the upper articular surface of the axis.)

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