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 girl 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 skull base. MR imaging showed mixed solid and cystic parts with multiple fluid–fluid levels in the lesion. The optic chiasma and bilateral optic nerves were severely compressed by the tumor.