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Figure 1: (a) Acute infarctions on diffusion-weighted imaging in the left MCA territories. (b) Neck CTA showed a septum in the left ICA. (c) Vessel wall MRI demonstrated a protrusion originating from the posterior wall of the left ICA. (d) DSA revealed membrane-like septa in the left ICA. (e) The left vertebral artery. (f) Histopathology demonstrated extensive fibromuscular proliferation (arrow) and myxoid degeneration (arrowhead) (Hematoxylin-eosin staining)

Figure 1: (a) Acute infarctions on diffusion-weighted imaging in the left MCA territories. (b) Neck CTA showed a septum in the left ICA. (c) Vessel wall MRI demonstrated a protrusion originating from the posterior wall of the left ICA. (d) DSA revealed membrane-like septa in the left ICA. (e) The left vertebral artery. (f) Histopathology demonstrated extensive fibromuscular proliferation (arrow) and myxoid degeneration (arrowhead) (Hematoxylin-eosin staining)