Cone beam computed tomographic myelography in horses with cervical vertebral compressive myelopathy.
Authors: González-Medina Sonia, Barrett Myra F, Aboellail Tawfik A, Nelson Bradley B, Nout-Lomas Yvette S
Journal: Equine veterinary journal
Summary
# Editorial Summary: Cone Beam CT Myelography for Cervical Vertebral Compressive Myelopathy in Horses Cervical vertebral compressive myelopathy (CVCM) remains a significant cause of ataxia and poor performance in horses, yet practitioners lack standardised diagnostic thresholds for imaging interpretation. This prospective study established quantitative morphometric criteria by comparing cone beam computed tomographic (CBCT) myelography findings in ten horses with confirmed CVCM against four control animals, with measurements validated against histopathology. Key diagnostic thresholds emerged: a full myelographic area below 294 mm², dural area below 188 mm², or spinal cord area below 104 mm² should raise suspicion of CVCM, whilst compressed sites specifically showed full myelographic area <274 mm², reductions in dural area >14%, and spinal cord-to-myelographic area ratios >36.7%. These objective parameters—derived from cross-sectional area measurements and proportional relationships rather than subjective assessment alone—provide practitioners with concrete benchmarks to support diagnostic confidence when CBCT myelography is available. Farriers, veterinarians and rehabilitation specialists can now reference these thresholds when interpreting imaging in cases of suspected CVCM, though the relatively small sample size warrants cautious application pending further validation in larger populations.
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Practical Takeaways
- •CBCT myelography offers objective, measurable criteria for diagnosing CVCM rather than relying on subjective radiographic interpretation alone—consider this imaging modality for suspected cervical compression cases.
- •Specific morphometric thresholds now exist to guide clinical decision-making: use full myelographic area <294 mm² as a screening threshold and <274 mm² at suspected compression sites.
- •CBCT should be used alongside conventional radiographic myelography rather than as a replacement, providing complementary quantitative data to support clinical diagnosis and treatment planning.
Key Findings
- •Intravertebral sagittal ratios were significantly different between CVCM and control horses, enabling differentiation between affected and unaffected animals.
- •Diagnostic thresholds for CVCM identified: full myelographic area <294 mm², dural area <188 mm², and spinal cord area <104 mm².
- •At compressed sites, thresholds included full myelographic area <274 mm², >9% reduction in myelographic area, and spinal cord area to dural area ratio >57.9%.
- •CBCT myelography provides quantitative morphometric parameters that complement radiographic myelography for objective CVCM diagnosis.