The use of magnetic resonance imaging in evaluating horses with spinal ataxia.

The research focused on determining the efficacy of magnetic resonance imaging (MRI) in diagnosing a condition called cervical stenotic myelopathy in horses, which exhibits as spinal ataxia. The study involved 39 horses with spinal ataxia, alongside 20 control horses. Despite some significant findings about spinal cord compression, the study found a slight agreement between MRI results and confirmed histopathological signs of the condition.

Research Methods

• The researchers studied a total of 59 horses — 39 that visibly exhibited spinal ataxia (a neurological condition that affects movement control), and 20 that functioned as a control group.
• All the horses underwent both clinical and neurological examinations, cervical radiographs (X-rays), euthanasia, and cervical spine MR imaging. After this, necropsy was performed.
• These horses were then subdivided further based on their diagnosis throughout the research process: 24 with cervical stenotic myelopathy, 5 with cervical vertebral stenosis, 7 with idiopathic ataxia, 3 with other ataxia causes, and 20 were controls.
• The researchers particularly assessed MR images for any noticeable changes in spinal cord intensity, spinal cord compression or its direction, spinal cord shape, and the presence of synovial cysts, joint mice, and degenerative joint disease.
• The dimensions of the spinal cord, dural tube, and vertebral canal — specifically the height, width, and area — were meticulously measured as part of this study.

Key Findings

• The research identified significant differences in horses diagnosed with cervical stenotic myelopathy when it comes to recognizing spinal cord compression on MR images.
• However, the agreement between histopathologic evidence of compression and the identification of spinal cord compression on MR images was considerably low in the group of horses diagnosed with cervical stenotic myelopathy.
• The study established that horses with cervical stenotic myelopathy were more probable to show a T2 hyperintensity in the spinal cord.
• The research also concluded that horses with either cervical stenotic myelopathy or cervical vertebral stenosis were more likely to exhibit degenerative joint disease than control horses or those with other or identified ataxia types.

Implication of the Findings

The findings of this research suggest that while MRI can identify some important factors related to cervical stenotic myelopathy and spinal ataxia in horses, it may not fully align with histological evidence of these conditions. Thus, the MRI-based diagnosis of neurological conditions like cervical stenotic myelopathy in horses might require further refinement or additional confirmatory tools.