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Click 45 year old male with craniocervical pneumatization. Non-contrast axial CT image (GE Lightspeed VCT, protocol: 120kV, 1mAs, 1.25mm slices, non-contrast, dose 506mGy) showing the extensive pneumatization of the occiput, C1 and posterior arch of C2. Continuous aeration from the left mastoid air cells into the apex of the left petrous temporal bone and left clivus can be seen. Areas of fluid attenuation are seen within the pneumatized occiput and cervical vertebrae. The remainder of the cervical spine is normal

Click 45 year old male with craniocervical pneumatization. MRI Axial T2 sequences (Philips Intera 1.5T, TR = 3658, TE = 120, slice thickness 3mm, non-contrast) of the base of skull and upper cervical spine. Areas of increased T2 signal in the occiput and spinous processes of C1 and C2 in keeping with fluid within the areas of pneumatization. Normal visualized spinal cord.

Click 45 year old male with craniocervical pneumatization. MRI Sagittal T2 sequences (Philips Intera 1.5T, TR = 3658, TE = 120, slice thickness 3mm, non-contrast) of the base of skull, cervical spine and upper thoracic spine. Areas of increased T2 signal in the occiput and spinous processes of C1 and C2 in keeping with fluid within the areas of pneumatization. The remainder of the cervical vertebral bodies return normal signal. Normal visualized spinal cord.