MRI Findings in Cervical Myelopathy Across Different Sequences
In cervical myelopathy, T2-weighted and STIR sequences show hyperintense intramedullary signal at the compression site, while T1-weighted images show hypointensity when there is irreversible cord damage, and T1 fat-suppressed sequences are primarily used post-gadolinium to detect active inflammation with characteristic "pancake-like" enhancement patterns.
T2-Weighted Imaging Findings
T2-weighted sequences are the workhorse for detecting cervical myelopathy and show:
- Hyperintense intramedullary signal at the level of maximal spinal cord compression 1, 2
- Signal changes that may be reversible (representing edema/gliosis) or irreversible (representing myelomalacia/necrosis) 2
- Lesions should be focal with clearly demarcated borders to be diagnostically significant 3
- The hyperintensity typically appears as cigar-shaped on sagittal images and wedge-shaped on axial images 3
Critical prognostic distinction: The number of vertebral segments showing T2 hyperintensity matters significantly. Multilevel T2 hyperintensity predicts poor surgical outcome 1, 4, while single-level changes have conflicting prognostic value 1.
T1-Weighted Imaging Findings
T1-weighted sequences without fat suppression reveal structural damage:
- Hypointense signal at the compression site indicates irreversible cord damage (myelomalacia, necrosis, cavitation) and portends the worst prognosis 1, 2
- Combined T1 hypointensity with T2 hyperintensity at the same level is a particularly poor prognostic indicator 1, 4
- T1 sequences are optimal for detecting spinal cord atrophy (transverse area <45 mm²), which predicts poor surgical outcomes 1
- Normal T1 signal suggests potentially reversible pathology 2
Key clinical pearl: T1 hypointensity represents the point of no return—these patients have the worst surgical outcomes regardless of decompression 2.
STIR (Short Tau Inversion Recovery) Findings
STIR sequences are highly sensitive to free water content and inflammation:
- Shows hyperintense signal at sites of cord edema and active inflammation 5
- Superior to T2-weighted imaging for detecting increased signal intensity, with higher signal intensity ratios 6
- Particularly valuable in diabetic patients with cervical myelopathy, where STIR has better prognostic value than T2-weighted sequences 6
- More susceptible to flow-related artifacts than conventional T2-weighted sequences, which can lead to false-positive interpretations 7
The STIR sequence demonstrates better capability than T2-weighted imaging for detecting intramedullary signal changes, though both sequences show similar predictive value for outcomes in non-diabetic patients 6.
T1 Fat-Suppressed Imaging (Post-Gadolinium)
T1-weighted sequences with fat suppression following gadolinium administration reveal:
- Active inflammation through contrast enhancement 5
- Characteristic "pancake-like" enhancement pattern on sagittal images and circumferential pattern on axial images, located within areas of T2 signal abnormality 8
- This enhancement pattern is highly specific for spondylotic myelopathy when present at the level of compression 8
- Enhancement is less frequent in spinal cord lesions compared to brain lesions and typically associated with new clinical symptoms 7
Important caveat: Contrast enhancement in cervical spondylotic myelopathy appears immediately at and below the level of stenosis 9. However, contrast is typically not required for diagnosis of spondylotic myelopathy—it's most useful when differentiating from inflammatory or infectious etiologies 9.
Algorithmic Approach to Interpretation
Step 1: Examine T2-weighted images first
- Identify hyperintense signal at compression site
- Count number of vertebral segments involved (multilevel = poor prognosis)
- Assess lesion morphology (should be focal, cigar-shaped)
Step 2: Correlate with T1-weighted images
- Look for hypointensity at same level as T2 changes
- If T1 hypointensity present = irreversible damage, worst prognosis
- Measure cord cross-sectional area (<45 mm² = poor prognosis)
Step 3: Consider STIR if available
- Particularly in diabetic patients
- Provides superior detection of signal changes
- Calculate signal intensity ratio for prognostic assessment
Step 4: Reserve T1 fat-suppressed post-gadolinium for specific scenarios
- When inflammatory/infectious etiology suspected
- To confirm spondylotic etiology (look for pancake-like enhancement)
- Not routinely needed for diagnosis
Common Pitfalls to Avoid
- Don't confuse diffuse ill-defined signal changes with focal lesions—only focal, well-demarcated lesions should be considered pathological 3
- Don't rely on T2 hyperintensity alone for prognosis—must correlate with T1 findings and number of segments involved 1, 4
- Don't assume all T2 hyperintensity is irreversible—regression of T2 hyperintensity postoperatively correlates with better outcomes 2
- Don't overlook flow artifacts on STIR—these can mimic pathology 7
- Don't order gadolinium routinely—it's not needed for typical spondylotic myelopathy diagnosis 9
The evidence consistently demonstrates that combined assessment across multiple sequences provides the most accurate diagnosis and prognosis, with T1 hypointensity being the single most important negative prognostic indicator 1, 2, 4.