A physician orders an MRI to assess a suspected disc herniation. Which tissue set does MRI best evaluate?

A physician orders an MRI to assess a suspected disc herniation. Which tissue set does MRI best evaluate?

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

Answer: (A)

MRI offers superior soft-tissue contrast, making it the best way to evaluate structures involved in a suspected disc herniation: the intervertebral discs, the spinal cord, and surrounding soft tissues. This modality can differentiate the hydrated nucleus pulposus from the annulus fibrosus, identify disc bulges or herniations, and show whether they compress the thecal sac or exiting nerve roots. It also reveals any associated soft-tissue changes, edema, or signal abnormalities in the spinal cord that might indicate myelopathy. Vertebral bodies and bone marrow are visible on MRI, but detailed bone anatomy and acute fractures are more accurately assessed with CT or plain radiographs. While nerve roots and ligaments are relevant, MRI’s strength lies in imaging the discs and neural elements together with the surrounding soft tissue, which is exactly what you need when evaluating for disc-related compression.

MRI offers superior soft-tissue contrast, making it the best way to evaluate structures involved in a suspected disc herniation: the intervertebral discs, the spinal cord, and surrounding soft tissues. This modality can differentiate the hydrated nucleus pulposus from the annulus fibrosus, identify disc bulges or herniations, and show whether they compress the thecal sac or exiting nerve roots. It also reveals any associated soft-tissue changes, edema, or signal abnormalities in the spinal cord that might indicate myelopathy.

Vertebral bodies and bone marrow are visible on MRI, but detailed bone anatomy and acute fractures are more accurately assessed with CT or plain radiographs. While nerve roots and ligaments are relevant, MRI’s strength lies in imaging the discs and neural elements together with the surrounding soft tissue, which is exactly what you need when evaluating for disc-related compression.