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Figure 1: DSA AP view. Pre-procedure: Left ECA injection; arterial phase: Showing abnormal early filling of left cavernous sinus (normally cavernous sinus filling will occur only in the later venous phase). Early filling indicates left cavernous sinus has abnormal communication with the arterial system

Figure 1: DSA AP view. Pre-procedure: Left ECA injection; arterial phase: Showing abnormal early filling of left cavernous sinus (normally cavernous sinus filling will occur only in the later venous phase). Early filling indicates left cavernous sinus has abnormal communication with the arterial system