Cervical spondylosis.
The "hard" cervical disc, a bony ridge resulting from periosteal activity, usually occurs in the patient with a previous neck injury. The "soft" disc is the bulging or extruded disc itself, often manifested by acute radicular pain in the younger patient. Causes of spondylotic myelopathy include a congenitally narrow spinal canal, disc degeneration and impaired vascularity. Disc syndromes include dysphagia and vertebral artery compression.
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Schmidek
D000792:Angiography; D002574:Cervical Vertebrae / Q000000981:diagnostic imaging; D003680:Deglutition Disorders / Q000209:etiology; D004576:Electromyography; D006801:Humans; D007403:Intervertebral Disc / Q000601:surgery; D007796:Laminectomy; D009192:Myelography; D009431:Neural Conduction; D013128:Spinal Osteophytosis / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D014057:Tomography, X-Ray Computed; D014715:Vertebrobasilar Insufficiency / Q000209:etiology