MRI for Diagnosis of Cervical Intervertebral Disc Syndrome
Why MRI is the Preferred Modality
- The American College of Radiology recommends MRI as the most sensitive imaging modality for assessing soft tissue abnormalities of the cervical spine, including disc herniations, nerve root compression, and spinal cord involvement 1, 2
- MRI correctly predicts 88% of cervical disc lesions compared to 81% for CT myelography, 57% for plain myelography, and only 50% for CT alone, as established by the American College of Radiology 2
- MRI provides excellent spatial resolution and intrinsic soft-tissue contrast for evaluating the spinal cord, nerve roots, disc spaces, and surrounding structures in multiple planes 3
- MRI can detect disc abnormalities, nerve root compression, canal stenosis, and cord signal changes that are critical for diagnosis and surgical planning, according to the American College of Radiology 1, 4
Recommended MRI Protocol
- The American College of Radiology suggests that for suspected cervical IVDS without "red flag" symptoms, MRI cervical spine without IV contrast is the appropriate initial study 2, 5
- Contrast is NOT routinely needed for degenerative disc disease evaluation, as recommended by the American College of Radiology 2, 3
- Add IV contrast only if "red flags" are present, including suspected infection, known malignancy, or concern for epidural abscess, as advised by the American College of Radiology 3
- For postoperative patients, MRI without contrast is usually appropriate for detecting adjacent level disc disease and nerve impingement, according to the American College of Radiology 6, 7
Critical Limitations and Pitfalls
- Abnormal MRI levels do not always correspond to clinical examination findings: in one study of patients with cervical radiculopathy, agreement between pain location and MRI findings was poor, highlighting the need for careful clinical correlation 1, 6
- Imaging findings MUST be correlated with clinical examination and symptoms - do not rely on MRI alone for diagnosis, as emphasized by the American College of Radiology 3, 5
When to Consider Alternative Imaging
- CT myelography is an acceptable alternative when MRI is contraindicated or nondiagnostic, according to the American College of Radiology 1, 8, 3
- CT myelography provides excellent visualization of the thecal sac, nerve roots, and bony structures at higher spatial resolution than MRI, as noted by the American College of Radiology 4
- Consider CT myelography for claustrophobic patients or when extensive hardware artifact limits MRI assessment, as recommended by the American College of Radiology 1, 8
- Be aware that myelography has documented procedural risks: patients may report unexpected reactions and experience pain during the procedure, highlighting the need for careful patient selection and informed consent 1, 4