Presentation
Head trauma - rule out intracranial bleed.
Patient Data













Left parietal scalp haematoma with tiny locules of air.
No intracranial haemorrhage (not shown) or skull fracture.
Incidental calcified right tentorial meningioma.
Basilar invagination and extensive dens erosion are both probably due to rheumatoid arthritis.
Mild anterolisthesis of C3 on C4 and of C4 on C5. Inversion of cervical lordosis around C5.
Kissing carotids. Exuberantly calcified atheromatous plaque around carotid bifurcations.
Calcified spinal meningioma at T2-T3 level, left anterior aspect.
Case Discussion
Incidental basilar invagination on a CT trauma head-neck, probably acquired due to rheumatoid arthritis, which can also explain the extensive erosion along the odontoid peg.