患者女，２３岁，妊２７周，非近亲结婚，早孕期曾患感冒，服用过抗感冒药，药名不详。Ｂ超所见：胎儿双顶径６８ｍｍ，头颅光环尚规则，脑中线无偏移，脑室无扩张，枕后探及一７０ｍｍ×５１ｍｍ的囊性肿物，形态不规则，边界清，内有纤细光带分隔成多房状，透声好（图１... Female patient, 23 years old, 27 weeks pregnant, non-relatives married, had a cold in early pregnancy, had taken anti-cold medicine, drug name unknown. B seen: fetus biparietal diameter 68mm, the rules of the head is still aura, the brain line without offset, no expansion of the ventricle, occipital exploration and a 70mm × 51mm cystic tumor, irregular shape, clear boundary, there are slender Light strip separated into multi-room state, through a good sound (Figure 1 ...