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A rare genetic neural tube defect malformation syndrome with characteristics of sacral agenesis and abnormal vertebral body ossification with normal vertebral arches associated with notochord canal persistence on ultrasonography. Additional findings include bilateral clubfoot, oligohydramnios, and single umbilical artery and in some cases increased nuchal translucency. There is evidence the disease can be caused by homozygous mutation in the T gene on chromosome 6q27.
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