case_images: PMC8035579_01
case_images: (a) T1-weighted magnetic resonance imaging showing hypoplastic odntoid process with ill-defined periodontoid tissue. (b) T2-weighted magnetic resonance imaging showing compression of neural structures at the craniocervical junction. (c) Computed tomography scan with the head in flexed position showing the hypoplastic odontoid process and atlantoaxial instability. (d) Computed tomography scan with the head in extended position showing "vertical reduction" of atlantoaxial instability. (e) Computed tomography scan with the cut passing through the facets showing Type 1 atlantoaxial facetal instability. (f) Postoperative computed tomography scan showing atlantoaxial fixation in aligned position. (g) Postoperative computed tomography scan showing the implant. (h) Follow up profile image of the patient (with permission)
case_images: JCVJS-12-91-g001.jpg
case_images: PMC8035579_01_JCVJS-12-91-g001.jpg
case_images: F1
case_images: There was evidence of Goel Type 1 facetal instability meaning thereby that on lateral profile imaging with neutral head posture the facet of the atlas was displaced anterior to the facet of the axis [Figure 1]. Postoperative imaging showed satisfactory stabilization of the craniovertebral junction [Figure 1].