患者，男性，24岁，主因视物成双1年，走路不稳半年入院。患者1年前无诱因出现视物成双，半年后行走不稳、饮水呛咳、说话费劲、头不自立抖动，进行性加重，行走困难伴低热、汗少、阳萎、生活不能自理。查体：内科情况中除体温37.5℃、皮肤干燥外余均正常。神经系统检查：意识 Patients, men, 24 years old, mainly due to double-vision for 1 year, walking unsteady six months admitted. Patient 1 year ago, there is no incentive to appear in pairs, six months after walking unsteady, coughing drinking water, talking hard, head drowsiness, aggravated, difficult to walk with fever, less sweat, impotence, life can not take care of themselves. Physical examination: medical conditions in addition to body temperature 37.5 ℃, the skin dry, I are more than normal. Nervous system examination: consciousness