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Aspergillus has been recognized in infections of the paranasal sinuses since 1891, and in invasive external otitis since 1985. Fungal mastoiditis is a very rare entity, which is almost exclusively sen in immunocompromised patients. The authors chronic intermittent otorrhea, otalgia and progressive hearing loss. On physical examination, attic destruction and adhesive tympanic membrane was sen in the right side. On temporal bone CT scans, soft tissue density was noted in the right mastoid antrum. After radical mastoidectomy, tissue pathology from mastoid cavity showed fungal ball of aspergillus. Fungal infec-tion of mastoid cavity is very rare, however, it can cause serious complications. So, we report here, with a review of literature, a case of fungal mastoiditis in an immunocompetent patient. (Korean J Otolaryngol 2002;45: )