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(A) CS window from PT perspective. (B) The prepontine area through the caroticosylvian window using the PT approach: mobilization of the ICA was necessary to increase the view to the BA, the PCA, the rami ad pontem, and the anterior upper surface of the brainstem (ON, optic nerve; A1, proximal segment of anterior cerebral artery; M1, proximal segment of middle cerebral artery).
