During endoscopic endonasal transsphenoidal surgery, which of the following vascular structures is most likely to be injured?
50% 5% Internal maxillary artery
Sphenopalatine artery is the answer.
The sphenopalatine artery is particularly vulnerable while enlarging the sphenoid sinus opening in the inferior and lateral direction. Once injured, it is necessary to cauterize the vessel after dissecting the mucosa off the sphenoid bone to visualize the artery clearly