A huge osteoblastoma with aneurysmal bone cyst in skull base

We reported a case of a huge osteoblastoma in the skull base of a young gir l who had developed blindness in her right eye 1 year prior to examination. CT showed a large expansile bony lesion with eggshell margin over the skul l base. MR imaging showed mixed solid and cystic parts with multiple fluid- fluid levels in the lesion. The optic chiasma and bilateral optic nerves we re severely compressed by the tumor. (C) 2001 Elsevier Science Inc. All rig hts reserved.