 Cervical spine:The anterior arch of C1 appears larger than typical, although the remainder of C1 appears intact without dysplasia. The immediately adjacent odontoid tip also appears atypical in appearance, yet without gross dysplastic change.Alignment is anatomic. There are no fractures or subluxations. The marrow signal is benign. The cervical cord is normal in signal. The cervicomedullary junction is normal. The cerebellar tonsils are in normal position. The visualized paraspinal contents are unremarkable. There are no stenoses.Thoracic and Lumbar spine:There is complex osseous dysplasia which begins at the T12/L1 level and includes only a partial L1 lumbar level, absent lumbar segments more inferiorly, with sacral agenesis. The paraspinal musculature also appears absent below the L1 level.The cord terminates just above the T10/11 level and demonstrates a blunt ended appearance. Nerve roots along the posterior central canal inferiorly demonstrate a thickened and clumped appearance. Neural foramina appear patent to the T12/L1 level, with nonvisualized neural foramina at the dysplastic L1/2 level, and none inferiorly.There appears to be a tract within the soft tissues that extends from the level of the dysplastic inferior aspect of L1 extending to the skin surface. There is a tiny, 6 mm, fluid appearing cystic portion along its mid aspect.
MRI evidence for caudal regression syndrome including lumbosacral agenesis.