CT
Complementary CT slices demonstrate bilateral nearly symmetrical calcified posterior extradural densities at the level of C4-5 corresponding to an ossified ligamentum flavum (OLF). Similar, but less severe, ossification is seen at the bilateral C3-4 ligamentum flavum. Multiple segmental mushroom-shaped ossified posterior longitudinal ligaments (OPLL) opposite the C5, C6 and C7 vertebral bodies. Focal ossification of the anterior longitudinal ligament (ALL) is demonstrated as well.