Which imaging modality is most definitive for visualizing disc bulges and nerve root compression?

• A. X-rays
• B. Electromyography and Nerve Conduction Velocity
• C. Magnetic Resonance Imaging
• D. Computed Tomography Scan

Answer: (C)

Magnetic resonance imaging is best for visualizing disc bulges and nerve root compression because it provides superior soft tissue contrast, allowing direct visualization of the intervertebral discs, the thecal sac, and the exiting nerve roots. You can see protrusions into the spinal canal or foraminal spaces and assess whether a nerve root is being compressed, which is essential for accurate diagnosis and planning. X-rays mainly show bone alignment and degenerative changes and miss soft tissue details. Electromyography and nerve conduction studies assess nerve function rather than anatomy. Computed tomography offers good bone detail but poorer soft tissue contrast compared with MRI (though CT, including CT myelography, can be used when MRI isn’t available or is contraindicated).