PMC183864_01
CT scan of the patient after the submission to the hospital, which demonstrates the SAH.
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F1
The patient underwent an unenhanced emergency cranial CT scan during the first hour of his admission, which revealed moderate subarachnoid hemorrhage (Fig. 1).
Lateral view of intra-arterial digital subtraction angiography shows the hypoglossal artery, which connects the left internal carotid artery with the basilar artery.
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F2
Instead, the selective catheterization of the left carotid artery disclosed a large persistent PHA originating from the internal carotid artery at the level of C2, which continued as basilar artery (Fig. 2).
Catheterisation of the right vertebral artery, which appears hypoplastic.
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F3
The catheterisation of the left subclavian artery demonstrated absence of the left vertebral artery whereas the right vertebral artery appeared hypoplastic (Fig 3).