In disc herniation terminology, which stage involves the nucleus pulposus breaching the annulus fibrosus but remaining connected to the main disc?

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Multiple Choice

In disc herniation terminology, which stage involves the nucleus pulposus breaching the annulus fibrosus but remaining connected to the main disc?

The concept is how disc material moves through the outer ring as a herniation progresses. When the nucleus pulposus breaks through the annulus fibrosus but stays tethered to the main disc by a stalk, that is extrusion. The material has breached the outer barrier yet remains connected to the parent disc, which distinguishes it from a completely free fragment. If the piece were to detach entirely and float independently, that would be a sequestration. Degeneration refers to general degenerative changes of the disc, not this specific stage of breaching with a continued link.

The concept is how disc material moves through the outer ring as a herniation progresses. When the nucleus pulposus breaks through the annulus fibrosus but stays tethered to the main disc by a stalk, that is extrusion. The material has breached the outer barrier yet remains connected to the parent disc, which distinguishes it from a completely free fragment. If the piece were to detach entirely and float independently, that would be a sequestration. Degeneration refers to general degenerative changes of the disc, not this specific stage of breaching with a continued link.

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