Neurol India Close
 

Figure 1: (a) Lateral plain radiograph of craniovertebral junction in flexion showing irreducible atlanto axial dislocation and fusion of C2 with C3; (b) computed tomography reformation shows narrowing of foramen magnum with anterior shift of posterior arch of atlas. Odontoid shows anterior curve (arrow); (c) magnetic resonance imaging study shows severe narrowing of foramen magnum with severe compression of cervicomedullary junction with fusion of C2/C3 and C5/C6. (d) Anteversion angle is formed by connecting a line through the base of the axis to one drawn through the odontoid process tip (arrow)

Figure 1: (a) Lateral plain radiograph of craniovertebral junction in flexion showing irreducible atlanto axial dislocation and fusion of C2 with C3; (b) computed tomography reformation shows narrowing of foramen magnum with anterior shift of posterior arch of atlas. Odontoid shows anterior curve (arrow); (c) magnetic resonance imaging study shows severe narrowing of foramen magnum with severe compression of cervicomedullary junction with fusion of C2/C3 and C5/C6. (d) Anteversion angle is formed by connecting a line through the base of the axis to one drawn through the odontoid process tip (arrow)