Cavernous Internal Carotid Artery Aneurysm: Exsanguinating Iatrogenic Internal Carotid Artery Injury During Transsphenoidal Surgery for Pituitary Macroadenoma – Packing, Transvenous Coil Occlusion of a Carotid Cavernous Sinus Fistula, and Repair of a Carotid Pseudoaneurysm with a Flow-Diverter Stent