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Infratemporal fosa absces is difficult to diagnose by conventional physical examination because of the anatomic location of this structure. Infratemporal fosa absces has been sen secondary to maxillary sinus fracture and infections involving the llary fat plane is the most notable feature. Streptoccus spp and Bacteroides spp have been isolated from the absces. Therapy consists of incision and drainage, and appropriate antibiotic therapy. The following case report and review of the literature are offered in hope of alerting physicians to the occurence of this disease and to the circumstances in which the diagnosis should be actively excluded. (Korean J Otolaryngol 2003 ;46 :338-40)