PMC5364901_01
(A) Axial plain CT scan at the time of admission shows right chronic subdural hematoma with thickness of 13 mm and MLS of 3 mm. (B) Axial plain CT scan after the operation shows the improvement of MLS. (C) Axial cervical bone CT scan shows calcifications behind the odontoid process suggesting CDS. (D) Sagittal cervical bone CT scan shows calcifications of the transverse ligament of the atlas at C1/2 level. (E) Calcification at C1/2 level could not be detected from frontal cervical radiograph. (F) Calcification at C1/2 level could not be detected from lateral cervical radiograph.
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F1
The MLS was improved (Fig. 1B).  Non-enhanced CT scan of the neck showed a high-density area in a crown- or halo-like distribution around the odontoid process that demonstrated atlantoaxial synovial calcifications ( Fig. 1C, D). CDS. Calcification at C1/C2 levels could not be detected from the frontal and lateral radiographs. (Fig. 1E, F).