PMC6766670_01
Pre-op CTA.
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fig2
CT angiography (CTA) revealed that a partially thrombosed aneurysm measuring 25 x 19 mm was located at the vertebrobasilar junction (AICA arises), causing mass effect on the pons (Figure 2).
Head position.
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fig3
The patient was in the supine position with the head turned right 80  and extended 30  (Figure 3).
C-shaped incision.
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fig4
C-shaped incision was made from mastoid process to hairline on the left side (Figure 4).
Temporal muscle dissection.
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fig5
Temporal muscle was dissected to expose the temporobasal region as well as zygomatic root, and the lateral suboccipital region as well as the complete mastoid (Figures 5 and 6).
Mastoid drilling.
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fig6
Temporal muscle was dissected to expose the temporobasal region as well as zygomatic root, and the lateral suboccipital region as well as the complete mastoid (Figures 5 and 6).