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Benign osteoblastoma is an uncommon primary tumor of the bone. Any area of the skeleton may be affected by this tumor, but its occurrence in the temporal bone and middle ear is extremely rare. Clinical symptoms are nonspecific, even in the middle ear, and the diagnosis is often difficult in spite a complete physical and radiological examination. A biopsy is usually necessary for definitive diagnosis. Because of its potential for recurrence, local invasion, and, rarely, malignant transformation, a complete surgical excision remains the treatment of choice for osteoblastoma. We report a case of benign osteoblastoma involving the temporal bone and the middle ear and a review of the literature. Although in 14 to 20% of cases this tumor affects the skull, its occurrence in the temporal bone and in the middle ear is extremely rare.2-4 We present a case of osteoblastoma in a young woman involving only the temporal bone and associated with tinnitus and progressive hearing loss. CASE REPORTA 26-year-old woman presented with a 6-month history of right pulsatile tinnitus and progressive hearing loss. She had no otalgia, otorrhea, otorrhagia, dizziness, or vertigo. In addition, no problem on the left ear was revealed. Her medical history was unremarkable except for a right hemithyroidectomy 3 years before and an antibiotic allergy. Clinical examination revealed a blush and swelling of the superior quadrants of the right tympanic membrane. The left ear and the facial function were normal. The Rinne test was negative in 256 and 512 Hz, and the Weber test showed lateralization to the right ear. The audiogram showed a 50 to 60 dB right conductive hearing loss.Computed tomography of the right temporal bone showed a soft tissue lesion with areas of calcification located at the epitympanum and 1

MO is a soft-tissue mass, reported only 3 times in the cervical paravertebral area in a search of the literature. We describe an additional case in a 10-year-old girl. We emphasize that in the unusual radial radiopaque roentgenographic image, a malignant tumor could be considered. We also stress that CT scanning can be of great value in establishing the diagnosis. The clinical types and the radiological and pathological features of MO are described in some detail and the "zonal" sign is described.

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