Diffuse Idiopathic Skeletal Hyperosteosis-MRI

DISH diagnostic criteria include the following : Flowing calcifications and ossifications along the anterolateral aspect of at least 4 contiguous vertebral bodies, with or without osteophytes. Preservation of disk height in the involved areas and an absence of excessive disk disease. Absence of bony ankylosis of facet joints and absence of sacroiliac erosion, sclerosis, or bony fusion, although narrowing and sclerosis of facet joints are acceptable.
Lower thoracic spine involvement is typical of DISH, but the lumbar and cervical spine also can be affected. The left side of the spine typically is spared or less involved, which probably is attributable to the pulsating aorta.

Ossification of posterior longitudnal ligament-CT

Ossification of posterior longitudinal ligament (OPLL) is a well-documented cause of cervical spine stenosis and myelopathy among Japanese patients. Its etiology still remains obscure. This entity is rarely seen in Indians. OPLL occurs after the age of 40 years and the most commonly affected region is the cervical spine, usually at C4/5, although the thoracic and lumbar regions are not exempt. The frequency of involvement diminishes as the level descends as follows: cervical 70-75%, thoracic 15-20% and lumbar 10%. The unexplained intimate relationship of OPLL with cervical spondylosis and diffuse idiopathic skeletal hyperostosis (DISH) is well known. This is post laminectomy CT scan of a case of OPLL.

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