Images 1, 2: 23 weeks of pregnancy; Image 1 shows a transverse scan of the normal looking fetal head. Image 2 shows sagittal scan through the deformed fetal spine (cervicothoracic kyphoscoliosis).

• 图1显示横切面扫描胎儿头部外形正常；图2为矢状面显示胎儿脊柱异常（颈胸段脊柱后侧凸）。