患者女,25岁,因G1P0孕29周、B超示无脑儿收住院,末次月经1996年10月25日。停经早期有轻度早孕反应;孕2月有轻度感冒发热症状,未服药自愈;孕3月内无接触有毒物品和农药史;孕5月感胎动;孕29周产检:宫高、腹围正常,胎心胎位正常,头颅轮廓不清,浮球感不明显。B超示颅骨光环显?.. Female patient, 25 years old, G1P0 pregnant for 29 weeks, B ultrasound showed no brain admitted to hospital, the last menstrual October 25, 1996. Early menopause mild early pregnancy reaction; mild symptoms of febrile fever in pregnancy in February, not taking medication self-healing; no contact with toxic substances and pesticides within the first three months of pregnancy; gestational pregnancy in May a sense of fetal movement; Around the normal fetal normal fetal position, skull outline unclear, floating sense of the ball is not obvious. B ultrasound showed skull aura?