Isolated cystic hygroma. Axial scan through the fetal face and mandible (M) demonstrates a retromandibular cystic mass (C) that corresponds to a cystic hygroma. S, cerical spine.

• 图11-21孤立性囊性水瘤。经过胎儿颜面和下颚（M）查显示下颚后与囊性水瘤相应的囊性包块（C）。S，颈椎。