A 6-year-old child presents with progressive gait abnormality, recent-onset urinary incontinence (regression after toilet training), and asymmetric cavovarus foot deformity. On examination, a midline lumbar tuft of hair with a small dimple is noted. Sagittal T2 MRI of the lumbosacral spine shows the conus medullaris terminating at L3 with a thickened filum terminale (3 mm) demonstrating T1 hyperintensity. The structure marked **A** in the diagram represents the underlying pathology. Which of the following best describes the PRIMARY mechanism of neurologic dysfunction in this condition?
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