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Spina Bifida
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16 weeks a b c
  Sonography demonstrates splayed vertebrae characteristic of a neural tube defect. Angular cerebral ventricles are a characteristic ventricular configuration associated with neural tube defects (ref. I. Trop. Radiology 2002; 223:652-660.)
18 weeks c d d
  The sacral spinal defect is evident on sagittal and axial images (red arrows). Note effacement of cerebrum magnum (blue arrow) due to Arnold-Chiari defect.
19 weeks c    
c c  
  At times the sack of a NTD is difficult to vizualize due to small size and partial volume averaging of fluid in the sack with amniotic fluid. On the sagittal image above left, skin covering the neural tube defect is visible.  
20 weeks c c c
  Angular cerebral ventricles are a characteristic ventricular configuration associated with neural tube defects (ref. I. Trop. Radiology 2002; 223:652-660.)
23 weeks c c c
      Note the Arnold-Chiari malformation on sagittal view.
26 weeks c c c
    In this axial image, skin covering the neural tube defect (arrow) is visible.  
29 weeks c c c
  Tethered spinal cord at the level of the kidneys. Neural tube defect at the level of the sacrum. Note the low position of the cord as it extends below the level of the kidneys.
32 weeks c c c
  A large, fluid filled sack originates from the neural tube defect. Note the skin-covered defect.