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Annular high-intensity zone

An annular high-intensity zone, often called HIZ, is a small bright focus on T2-weighted MRI...

Annulus fibrosus

Tough outer portion of an intervertebral disc, formed by fibrous layers surrounding the nucleus pulposus.Lire...

Anterior cord syndrome

Cord injury pattern mainly affecting anterior-region functions, with motor and pain-temperature impairment and relative preservation...

Anterior longitudinal ligament

The anterior longitudinal ligament is a fibrous band running along the front of vertebral bodies...

Anterior spinal artery

Longitudinal artery on the anterior spinal cord that, with segmental contributions, supplies much of its...

AO Spine injury classification

Set of traumatic spinal injury classifications based on morphology, neurological status and modifiers specific to...

Apparent diffusion coefficient

Parameter calculated from diffusion images describing apparent water mobility in tissue, often displayed as an...

Artery of Adamkiewicz

Large anterior radiculomedullary artery reinforcing thoracolumbar spinal cord blood supply, with a variable origin and...

Atlanto-occipital joint

Joint between the occipital condyles and the upper atlas surfaces, allowing movements including nodding of...

Atlantoaxial instability

Atlantoaxial instability is abnormal movement between the atlas, the first cervical vertebra, and the axis,...