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Figure 15: By drilling underneath GSPN, the petrous carotid is exposed which forms the lateral boundary of Kawase's quadrangle. The posterior boundary is IAC. The anterior boundary is posterior border of V3. The GSPN and petrous carotid pass forwards underneath V3

Figure 15: By drilling underneath GSPN, the petrous carotid is exposed which forms the lateral boundary of Kawase's quadrangle. The posterior boundary is IAC. The anterior boundary is posterior border of V3. The GSPN and petrous carotid pass forwards underneath V3