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Figure 1: (a) AP and lateral view of cerebral DSA, left cavernous sinus injection depicting bilateral cavernous and inferior petrosal sinuses (b) Final position of microcatheter tips at the midportion of bilateral inferior petrosal sinus for blood sampling

Figure 1: (a) AP and lateral view of cerebral DSA, left cavernous sinus injection depicting bilateral cavernous and inferior petrosal sinuses (b) Final position of microcatheter tips at the midportion of bilateral inferior petrosal sinus for blood sampling