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Figure 17: Kawase's triangle/quadrangle is the petrous bone bounded laterally by petrous carotid artery, anteriorly by posterior border of V3, posteriorly by the anterior border of IAC. This bone is devoid of neurovascular structures and is removed to gain access to posterior fossa

Figure 17: Kawase's triangle/quadrangle is the petrous bone bounded laterally by petrous carotid artery, anteriorly by posterior border of V3, posteriorly by the anterior border of IAC. This bone is devoid of neurovascular structures and is removed to gain access to posterior fossa