A Y-shaped sphenoidal sinus septum: a case report.

The sphenoidal sinus septum is one of the most important landmarks during endonasal endoscopic transsphenoidal operations. During routine coronal sectioning of the face, we found a variant Y-shaped septum in the sphenoidal sinus of a female cadaver. This unusual septum was found between two sections (anterior and posterior sections) and located inferior to the pituitary gland. The sphenoid sinus was divided into three chambers by the septum, i.e., right, middle, and left. During endoscopic surgery, surgeons should be aware of these variations. To our knowledge, this report documents the first Y-shaped septum of the sphenoidal sinus. Such information can be helpful for surgeons.