Benign Osteoblastoma of the Temporal Bone / 대한이비인후과학회지

ABSTRACT

An osteoblastoma is a rare, benign and vascular tumor of bone that commonly affects the vertebrae or the long bones. Histologically, it is characterized by numerous osteoblast cells and its occurrence in the temporal bone is extremely rare in the world thus far. A 17-year old woman was referred to us with an one-year history of tinnitus and decreased hearing in the right ear. CT (computerized tomography) scan showed a 2.5 X 2 X 1 cm sized, well defined soft tissue mass with central heterogeneous high density lesion in the right temporal bone. T1 and T2-weighted MRI (magnetic resonance image) scan showed iso-signal intensity and strong enhancement with administration of contrast materials at the periphery. Biopsy specimen showed the bony trabeculae of various sizes and rimming osteoblasts surrounded by spreading vascular stromas. Preoperative arterial embolization was done because massive bleeding during operation was expected. We did partial resection of the tumor wih the open cavity mastoidectomy with type III tympanoplasty. She was in good shape and there was no evidence of neurological deficits or recurrence after 17 months' follow-up. We experienced an osteoblastoma of the temporal bone. So we present this case with literature reviews.