Lumbarisation of S1
Fall down steps. Tachycardia. Trauma scan.
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Transitional vertebral anatomy with six lumbar-type vertebrae (lumbarisation of S1). No traumatic injury.
This is an example of lumbarisation of S1, which is the rarer of the two types of lumbosacral transitional vertebral anatomy.
This case is definitive because whole spine imaging (not shown) was performed.