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26-year-old woman with thoracic pain. MRI of the spine with sagittal T1-weighted images (a) and a coronal reformat of a sagittal SPACE sequence (b) demonstrates a transitional lumbosacral vertebra. Counting from the top, this is a sacralised L5 vertebra. The coronal reformats are very helpful in identifying the transitional nature of this vertebra. It is more easily appreciated on an anterior-posterior (AP) radiograph of the lumbar spine (c)
