Hi Doc, I had ultra sound and the impression is Single,live,intrauterine pregnancy,31 weeks,1 day by sonar age . Consider cephalocoele.normohydramnios.posterior placenta. OTHERS: Adjacent the head and the neck is an ane choic lobulated cystic structure meas.6.7 x 6.3cm. Please doc can you explain it briefly becos im scared and always worrying about it.please help me.