Limitations of primary imaging
The cervical spine includes the most mobile and vulnerable zones: the subaxial (C4–C7) and craniocervical (C1–C2) junctions. These segments can be severely damaged even with relatively minor physical impact.
Historically, initial assessment was performed using conventional radiography, including at least three projections: lateral (necessarily capturing the cervicothoracic junction), anteroposterior, and anteroposterior view of the dens. If the cervicothoracic junction is not visible, the swimmer's view is used. However, radiography is relatively insensitive to injuries, with up to 55% of cervical spine fractures remaining undetected.
Computed tomography (CT) provides a high-quality anatomical assessment of fractures and bony stability. Nevertheless, CT does not allow ruling out ligamentous injury. The spine can be completely unstable due to ligamentous tears even in the absence of visible bone fractures. Therefore, in the case of negative CT or X-ray findings, spinal immobilization is necessary until trauma is definitively excluded.
Indications for MRI and emergency situations
Magnetic resonance imaging (MRI) is the gold standard for assessing the soft tissues of the spine. Its performance is mandatory in the following cases:
- Persistent pain upon careful movement, despite "clean" CT and radiography results.
- Presence of any neurological symptoms after trauma.
- Suspicion of a ligamentous tear.
Patients under neurological monitoring require special attention. Any clinical deterioration dictates the need for an emergency MRI. The main goal of the study in such a situation is to rule out spinal cord compression by an expanding epidural hematoma. Emergency surgical drainage will not reverse the initial injury, but it will prevent further progression of the neurological deficit due to cord compression.
Clinical rule: about 15% of spinal fractures are multiple and non-contiguous. Therefore, when detecting an injury in the cervical spine, the clinician is obligated to thoroughly examine the entire spine, including the thoracolumbar junction.
Standard MRI protocol
A routine spinal MRI protocol must provide a comprehensive assessment of the spinal cord, bone marrow, and paraspinal tissues. It mandatorily includes:
- Sagittal T1-weighted sequence (T1WI).
- Sagittal T2-weighted sequence (T2WI).
- Sagittal T2 with fat suppression (STIR — visualizes bone marrow and soft tissue edema).
- Axial T2-weighted sequence (Axial T2).
In the postoperative period, the protocol is expanded: it is necessary to add axial T1 before and after intravenous administration of a contrast agent (gadolinium). MRI significantly outperforms CT in detecting postoperative fibrosis, although SPECT/CT is the best choice for assessing fixation hardware loosening (SPECT/CT).
Specific MRI findings
Brachial plexus injury On coronal T2WI in MR myelography mode, severe traction injuries can be diagnosed. A characteristic pathological finding is avulsion of the brachial plexus roots (at the C8–Th1 levels) with the formation of traumatic meningoceles. On tomograms, they appear as hyperintense (bright) areas of cerebrospinal fluid accumulation.
Neuromyelitis optica (Devic's disease) In this demyelinating disease, cervical MRI reveals specific semiotics:
- On sagittal T2WI, a longitudinally extensive, poorly marginated hyperintense signal is determined, often encompassing the entire cervical and upper thoracic spine.
- The spinal cord at the level of the lesion is moderately thickened due to edema.
- On post-contrast T1WI, focal (heterogeneous) contrast enhancement is visible.
- On transverse axial slices (T2WI), the pathological lesion occupies more than 2/3 of the area of the spinal cord cross-section, which is a marker of extensive transverse myelitis.
To memorize the standard spinal MRI protocol, use the "Three Sagittals and One Axial" rule: Sag-T1, Sag-T2, Sag-STIR + Ax-T2.
Class and exam questions
Why is it impossible to limit diagnostics to CT alone in neck trauma?
CT excellently visualizes bone structures, but is unable to detect ligamentous injuries. The spine can be unstable due to ligamentous tears with completely intact vertebrae.
In which case is a cervical MRI performed on an emergency basis?
Emergency MRI is indicated for sudden deterioration of the patient's neurological status to rule out epidural hematoma requiring immediate surgical intervention.
What is the main MRI sign of neuromyelitis optica in the cervical spine?
A longitudinally extensive hyperintense signal on T2WI encompassing the entire cervical spine, which occupies more than 2/3 of the spinal cord area on an axial slice.
What else to study on this topic
- AOSpine subaxial cervical spine injury classification system
- TLICS injury severity score for the thoracolumbar region
- SPECT/CT in postoperative spinal monitoring
- Kümmell's disease and avascular necrosis of vertebrae
- The role of digital subtraction angiography (DSA) in the evaluation of spinal arteries
Master the entire topic in the "Diagnostic Radiology" course
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- Complete guide on "Cervical MRI" and 2,199 more pages of the subject
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 10 video lessons on the subject
Other topics in the "Spine" section
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.