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Defining the area of tumor attachment. The dura mater encompassing the cavernous sinus, clivus, foramen magnum, and tentorium is separated into three areas. Area 1 (blue): cavernous sinus and upper clivus up to the internal auditory meatus; Area 2 (green): lower clivus down to the internal auditory meatus and foramen magnum; Area 3 (yellow): tentorium cerebelli.
