Disc protrusion

Disc protrusions are a type of disc herniation characterised by protrusion of disc content beyond the normal confines of the intervertebral disc

A protrusion is distinguished from a disc bulge in that it involves less than 25% of the circumference of the disc. Conversely it is distinguished from a disc extrusion in that its base is wider than its 'dome' and it does not extend above or below the disc level. 

It may also be described in terms of its axial position, into central, subarticular, foraminal, extraforaminal or anterior locations.

Additionally the terms contained (outer annulus fibrosus laminae are intact) and non-contained (all laminae are deficient) are also sometimes used.


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Article Information:

rID: 6193
Section: Pathology
Tag: refs
Synonyms or Alternate Spellings:
  • Disc protrusions
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    Figure 1: illustration
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    A broad based dis...
    Figure 2
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    Figure 3: axial disc herniation position
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    Figure 4: sagittal localisation
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    Case 1: posterolateral focal protrusion
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    Focal central dis...
    Case 2: focal central disc protrusion
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    Case 3: right paracentral disc protrusion
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    Focal disc protru...
    Case 4: central focal disc protrusion
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    Case 5
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    Case 6
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