患儿男,18个月。反应迟钝,发育落后就诊。患儿为第1胎第1产足月剖宫产。发育营养差,表情呆滞,智力低下,不能坐立行走。体检:头围54cm,囟门宽,体重6kg,身高65cm。神经系统检查:落日征(+),双侧瞳孔等大等圆,对光反射正常,颈软,无强直。四肢肌张力略低,腱反射减弱。CT平扫示:头颅 Children male, 18 months. Unresponsive, poorly developed treatment. Children with first-born fetus for the first full-term cesarean section. Development of poor nutrition, dull expression, mental retardation, can not sit and walk. Physical examination: head circumference 54cm, fontanelle width, weight 6kg, height 65cm. Nervous system examination: sunset sign (+), bilateral pupil and other large circle, the light reflex normal, soft neck, no rigidity. Limb muscle tension is slightly lower tendon reflexes. CT flat scan shows: skull