Clival chordomas are particularly difficult to manage because these tumors usually involve not only the intra-extra dura of the clivus, but also the bone of paraclivus, sella, atlas, odontoid process
as well as the ICA, cavernous sinus, vertebral artery, basilar artery, and brainstem, etc .
Odontoid Open Mouth View is for suspected C2 fracture and should show lateral masses of the first cervical vertebra and entire odontoid process
The head position is estimated on the basis of the craniocervical angle, which is formed by the basic anterior cranial base (NS), and odontoid process
tangent (OPT) which passes through the lower end last point on the body of the second cervical vertebra .
Some cases have reported associated fractures of the lateral mass and odontoid process
Of significance for this case, the odontoid process
was found to be 5 mm above Chamberlain's line.
the odontoid process
of the second cervical -- Posterior tangent to the odontoid
Radiographs were reviewed for the following features: loss of cervical lordosis, odontoid process
erosion, anterior atlantoaxial subluxation, C1-C2 arthritis, atlantoaxial impaction, inflammation of disc, apophyseal joint arthritis, anterior ankylosis, apophyseal joint ankylosis, anterior and posterior subaxial subluxation and growth disturbances.
The anterior arch of C1 as well as the contralateral two-thirds of the odontoid process
were left intact to aid in postoperative stability.
The MRI also showed assimilation of the odontoid process
of C2 and the C1 vertebral body.
In IGM 9563 the odontoid process
in the cervical tube is anteriorly directed and inclined almost 45[degrees] as in G.
1a), the vertical axis must cross the following coordinates: vertex; odontoid process
of the second cervical vertebra (C2); vertebral body of the 3rd lumbar vertebra and, at the same distance, within the support base, between the two soles; concomitantly, the scapular and gluteal planes are aligned.
Images were oriented in such a way that the vertical grid would go through the middle odontoid process
and the nasopalatine foramen in the upper residual ridge; and in the lower residual ridge it would go horizontally through the menton orifice and vertically through the middle of the vertebra.