The facets are: small joints between the posterior parts of adjacent vertebra. Sclerosis generally implies degenerative arthritic changes. Lower two levels refers to the facets involving the lowermost 4 vertebra(each facet joint involves 2 adjacent vertebra).
Answered 4/23/2017
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Bone sclerosis: Arthritis and thickening of bone in images obtained. If no symptoms just a fact of aging most likely
Answered 5/7/2017
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