Analysis of the suprabullar and retrobullar recesses for endoscopic sinus surgery

Presently, the basic structures and spaces of the paranasal sinuses Lire mo re clearly understood by otolaryngologists than ever before. Yet, the more subtle and complex ethmoid features, especially of the ethmoidal pre-recess es and recesses, still elude many otolaryngologists. One of the most nebulo us, elusive, and difficult-to-understand recesses is the sinus lateralis, o r as it is more correctly called, the retrobullar and suprabullar recesses. The primary purpose of this investigation was to ascertain the prevalence of the sinus lateralis in humans. The secondary purpose was to better chara cterize this subtle feature of ethmoid anatomy. Human cadaver sinonasal com plexes were meticulously dissected by both gross and endoscopic techniques. The hiatus semilunaris superior and sinus lateralis were present in all sp ecimens. A separate and discrete retrobullar recess was present in 93.8%. T ypically, a crestlike projection from the basal lamella to the lamina papyr acea was noted within the posterior aspect of the retrobullar recess. A sin gle. discrete, well-developed suprabullar recess was present in 70.9%. and a rudimentary suprabullar recess was present in 22.9%. In 7.2%, a single la rge cleft collectively excavated the retrobullar and suprabullar recess are as; separate retrobullar and suprabullar tracts were not present in this su bgroup. Typically. the suprabullar recess was separate from and did not com municate with the frontal recess. The data from this investigation indicate that the separate terms retrobullar recess and suprabullar recess more acc urately designate the anatomy and are recommended over the term sinus later alis.