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Sectioning of the ICA as used for sonographic examination, counting from the terminal to the proximal part to the intracranial ICA. Reprinted from Schünke et al17 with permission from Thieme Medical Publishers, Stuttgart, Germany. Note that this classification is different from the digital subtraction angiography classification, which names the cervical ICA, C1; the petrosal part, C2; and so on to the terminal ICA, C7 (Osborn18).
