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Lipomyelomeningocele
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Sonography of this 31 week fetus demonstrated a spinal cord defect (arrow) but no Arnold-Chiari malformation.  
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Axial MRI shows spinal defect (arrows) and tethered spinal cord at the level of the kidneys (K). Note the large amount of tissue of signal intensity similar to subcutaneous fat that is in the region of the defect. This is consistent with a lipomyelomeningocele.