Prolapse of lumbar intervertebral disc protrusion stenosis diagnosis CT

The introduction of intervertebral disc herniation, lateral recess stenosis (less than 2mm), yellow ligament hypertrophy (> 5mm), ossificati

Content

The introduction of intervertebral disc herniation, lateral recess stenosis (less than 2mm), yellow ligament hypertrophy (> 5mm), ossification of the posterior longitudinal ligament, vertebral bone hyperplasia may also lead to the effective area of spinal stenosis. The far lateral disc type: shadows on spinal limitations beyond the edge of the vertebral body, with fibrous ring calcification, osteophyte formation, spinal and peripheral muscle, ligament compression and displacement.

Keywords: ossification of intervertebral foramen | bulging of lumbar intervertebral disc | spinal stenosis |CT | posterior longitudinal ligament

Conventional lumbar CT scan

Conventional lumbar CT scan L3-S1 segment, divided into

The vertebral level (bone window): Observation of vertebral body, bone attachment.

The level of intervertebral disc (soft tissue window): Observation of intervertebral disc, dural sac and nerve root, ligaments and other soft tissue.

Intervertebral disc degeneration

Decreased disc height

Intervertebral disc degeneration: intervertebral disc see the gas density, the formation of vacuum.

Sn (Schmorl s nods): also known as the nucleus impressio.

Calcification of fibrous ring

Intervertebral disc prolapse:

The intervertebral disc was more uniform than the corresponding vertebral edge, and the mild CT showed that the normal renal depression in the posterior border of the intervertebral disc disappeared and the roundness was plump.

Protrusion of intervertebral disc:

The central type: disc shadow limitations beyond the edge of the vertebral body, the dural sac can be compressed, epidural fat gap narrowed and disappeared, accompanied by calcification of fibrous ring.

The paramedian disc image: limitations beyond the edge of the vertebral body, nerve root compression

After the lateral type: disc shadows on intervertebral foramen limitations beyond the vertebral edge direction, nerve root compression, intervertebral foramen and lateral recess.

Spinal stenosis

Imaging diagnostic criteria:

Before and after the lumbar spinal canal diameter less than or equal to 15mm in a relatively narrow; absolute stenosis is less than or equal to 12mm.

Before and after the dural sac diameter less than or equal to 7mm;

The intervertebral disc herniation, lateral recess stenosis (less than 2mm), yellow ligament hypertrophy (> 5mm), ossification of the posterior longitudinal ligament, vertebral bone hyperplasia may also lead to the effective area of spinal stenosis.

Epidural fat clearance narrowed and disappeared with fibrous ring calcification.

The far lateral disc type: shadows on spinal limitations beyond the edge of the vertebral body, with fibrous ring calcification, osteophyte formation, spinal and peripheral muscle, ligament compression and displacement.

 

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