An ossific mass arises from the inferior aspect of the left C5 articular pillar which also has a large non-mineralized soft-tissue component. This lesion creates large, well-defined and well–corticated pressure erosions of the adjacent C5 and C6 vertebral bodies and pedicles on the left. It also involves the left C5 transverse process but does not significantly distort its contour, however it severely distorts the contour of the C6 transverse process, transverse foramen, and articular pillar on the left. The left C5/C6 and C6/C7 intervertebral foramen appear completely occluded by the mass. At the level of C5 the mass extends into the epidural space and narrows the transverse diameter of the central canal to approximately 11 mm.