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CTA a few days later after surgical drainage:
Staus post almost complete drainage of the left subdural hematoma. The collection along the tentorium is virtually unchanged.
Subarachnoid blood present in the ventricles and sulci at multiple locations bilaterally.
Bilateral carotid dolichoectasia, with circumferential fusiform aneurysms showing mural thrombi in the C4 segments, more pronounced on the left.
Significant atherosclerosis, about 50% narrowing of the intracranial right vertebral artery.
Incidental heterogeneous, partially cystic thyroid nodules.