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There is agenesis/hypoplasia of the sacrum and the lower two lumbar vertebral bodies with fusion of the iliac bones posteriorly in the midline.
There is abrupt termination of the spinal cord at upper border of T11 vertebra with a blunt cauda equina.
There is narrowing of the pelvis with significant atrophy of the gluetal muscles.
A cyst seen as hyperintense on STIR is noted in the midline posterior to the anal canal.