患者，男，７０岁。因头痛伴双眼视力减退２年于２０００年２月２４日入院。检查：神志清楚，双眼视力稍降低，无视野缺损，双瞳孔等大，光反射灵敏。其它各组颅神经正常，四肢肌力，肌张力正常，无病理征。头颅ＭＲＩ见鞍内及鞍上Ｔ１加权呈低信号，Ｔ２加权里高信号的实性肿? Patient, male, 70 years old. He was admitted to hospital on February 24, 2000 due to headache and binocular vision loss for 2 years. Examination: conscious, slightly reduced visual acuity, no visual field defects, double pupils, etc., light reflectance sensitive. All other groups had normal cranial nerves, limb muscle strength, normal muscle tone, and no pathological signs. The cranial MRI showed hypointensity in the intra-and intra-saddle T1 weighting, and in the T2 weighted high-signal solid edema?