Knosp classification (diagrams)

Case contributed by Assoc Prof Frank Gaillard

Three lines are drawn between the supraclinoid ICA and intracavernous ICA on coronal MRI imaging. 

  1. medial tangent
  2. intercarotid line
  3. lateral tangent

These lines are used to define 4 grades of tumor invasion: 

  • grade 0 = medial to medial tangent
  • grade 1 = tumor extends to space between the medial tangent and the intercarotid line
  • grade 2 = tumor extends to space between the intercarotid line and the lateral tangent
  • grade 3 = tumor extends lateral to the lateral tangent
    • 3A = above the intracavernous ICA into the superior cavernous sinus compartment
    • 3B = below the intracavernous ICA into the inferior cavernous sinus compartment
  • grade 4 = complete encasement of intracavernous ICA
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Case information

rID: 71524
Published: 10th Oct 2019
Last edited: 11th Oct 2019
Inclusion in quiz mode: Excluded

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