Central canal stenosis with bony outgrowths from facets, laminae or pedicles, degenerative spondylolisthesis, or hypertrophied/calcified ligamentum flavum is best described as which type?

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Central canal stenosis described here results from degenerative changes in the spine. The bony outgrowths from facet joints, laminae, or pedicles, along with degenerative spondylolisthesis and hypertrophy or calcification of the ligamentum flavum, are classic aging- or wear-and-tear–related changes that progressively narrow the canal. Because these changes develop over time rather than being present at birth, it is best described as acquired. Congenital stenosis would mean a narrow canal exists from birth due to a developmental anomaly, not due to osteophyte formation or ligamentous changes. Inflammatory processes would involve inflammatory tissue or systemic disease, not the degenerative bony and ligamentous remodeling described. Posttraumatic stenosis would follow an injury with scar or malalignment, which is not the pattern here.