Extended transbasal approach with preservation of olfaction: ananatomical study.

Many craniofacial approaches to the sphenoethmoidal region, anterior fossa, and central skull base compartment have been described, a number of which involve the mobilization of the frontonasoorbital complex en bloc. Spetzler's modification incorporates osteotomies around the cribriform plate, to preserve olfaction. In this morphological study of three cadavers, photographs were used to show the technique and define its anatomical boundaries and limitations. The study illustrates access to a number of anatomical regions, particularly the exposure of the medial orbit, the cavernous sinus, the clivus, and the vertebrobasilar complex.