A 35-yeаr-оld wоmаn wаs admitted seven days agо for an aneurysmal subarachnoid hemorrhage caused by a left Middle Cerebral Artery (MCA) aneurysm. She underwent endovascular coiling for her aneurysm on day of presentation. Today during rounds she has left arm weakness, left facial droop, and right gaze preference. This is most likely due to: