Any structural anomaly of the conus terminalis, which is the distal bulbous part of the spinal cord at the location where the spinal cord tapers and ends (usually between the L1 and L2 lumbar vertebrae).
Abnormal spinal cord physiology
Abnormal spinal meningeal morphology +
Abnormality of the dorsal column of the spinal cord +
Abnormality of the spinocerebellar tracts +
Atrophy/Degeneration involving the spinal cord +
Cervicomedullary schisis
Hyperintensity of MRI T2 signal of the spinal cord