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Knosp grades of patients. (A) Knosp 0, tumor is medial to medial tangent. (B) Knosp I, tumor extends to the space between the medial tangent and the intercarotid line. (C) Knosp II, tumor extends to the space between the intercarotid line and the lateral tangent. (D) Knosp III, tumor extends lateral to the lateral tangent. (E) Knosp IV, tumor with a complete encasement of intracavernous internal carotid artery.
