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Example images of spine disease categories. (a) Normal cervical spine. (b) Loss of normal cervical lordosis. (c) Minor/nonobstructive osteophyte. (d) Partially obstructive osteophyte. (e) Obstructive osteophyte. (f) History of anterior cervical spine surgery. (g) History of posterior cervical spine surgery. (h) Early degenerative disc disease. (i) Advanced degenerative disc disease. (j) Diffuse idiopathic skeletal hyperostosis. (k) Pronounced lordosis.
