A 3-year-old German Shepherd Dog has progressive pelvic limb ataxia. MRI reveals an intramedullary T2-hyperintense lesion at L4 that does not contrast-enhance. The most likely diagnosis is:
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A
Intervertebral disc herniation
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B
Degenerative myelopathy
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C
Neoplasia (ependymoma)
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D
Fibrocartilaginous embolism