The sphenoid bone has a specific development during fetal life, until it reaches its complete dimensions. The sphenoid cavities are usually undeveloped at birth and they reach their full volume only after puberty. Pneumatization of the sphenoid sinus is unpredictable and different for each person.

The authors do not intend to develop a literature review or to compare their experience with data already published. The paper is not an original imagistic study of the authors, it only represents a short communication on the imagistic anatomy of the sphenoid sinus, in order to avoid complications during surgery in the area.

Based on their patients own CT-scan examination, the authors try to classify the anterior, lateral and posterior extensions in close connection with the surgical endoscopic approach of the sphenoid sinus.