A 49-year-old white female patient was referred to the ENT Department, Zentralkrankenhaus, Bremen, because of conductive hearing loss. Widespread tumor formation was found in the left temporal bone and was identified by biopsy to be an osteoclastoma. The tumor was extirpated surgically and reconstruction was performed. Periodic clinical follow-ups during a 36-month period after surgery have included control computed tomographic scans and have shown no evidence for recurrent disease. The specific pathology of the osteoclastoma is presented and different ways for treatment are discussed.