A 62-year-old man presents with progressive spastic gait, weakness and atrophy of the hands, and a positive Hoffman sign. On sagittal T2-weighted MRI of the cervical spine, the structure marked A (cervical spinal cord) shows intermediate signal intensity within hyperintense CSF, with focal T2-hyperintense signal within the cord at the C5-C6 level. Which of the following best explains the clinical presentation and imaging finding?

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