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Upper panel: MR angiography, axial view. Proximal and distal segments of MCA marked as M1 and M2, respectively. ACA: anterior cerebral artery; SIPHON: carotid siphon; MCA: middle cerebral artery. Lower panel: Transcranial colour coded sonography, axial view. M1 and M2 segments of MCA insonated at a depth of 55–65 mm and 45–55 mm, respectively, from the skull wall (marked by the white curved line). The carotid siphon is not visible as it courses orthogonal to the scanning plane.
