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(A) Open spina bifida (non-eligible for fetal surgery). First and second sacral vertebral defect with cord, dorsal sac (arrow), and placode. The three-dimensional model shows intervertebral discs (yellow) and spinal canal (blue). (B) Open spina bifida (eligible for fetal surgery). Low sacral defect with hindbrain herniation (upper arrow on sagittal view). C=spinal cord. P=placode.
