In evaluating a suspected spinal canal stenosis via MRI, which tissue groups are central to the assessment?

In evaluating a suspected spinal canal stenosis via MRI, which tissue groups are central to the assessment?

• A. Facet joints and ligaments
• B. Disc, cord, soft tissue
• C. Vertebral bodies and bone marrow
• D. Nerve roots and blood vessels

Answer: (C)

Assessing spinal canal stenosis on MRI hinges on how the bone anatomy narrows the canal. The vertebral bodies and their bone marrow form the primary bony framework that defines the canal’s space, and degenerative changes such as osteophyte formation and endplate remodeling here tend to encroach on the canal most directly. These osseous changes are the chief drivers of central canal narrowing, so they are the focus when evaluating stenosis. Other structures like the discs, ligaments, and posterior elements can contribute to narrowing and the spinal cord or nerve roots show the effects of compression, but the presence and extent of bone-related encroachment on the vertebral bodies are the key factors in determining canal size.

Assessing spinal canal stenosis on MRI hinges on how the bone anatomy narrows the canal. The vertebral bodies and their bone marrow form the primary bony framework that defines the canal’s space, and degenerative changes such as osteophyte formation and endplate remodeling here tend to encroach on the canal most directly. These osseous changes are the chief drivers of central canal narrowing, so they are the focus when evaluating stenosis. Other structures like the discs, ligaments, and posterior elements can contribute to narrowing and the spinal cord or nerve roots show the effects of compression, but the presence and extent of bone-related encroachment on the vertebral bodies are the key factors in determining canal size.