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Sacralised L5 vertebra.
L4/5 degenerative disc changes seen as decreased hydration signal. It shows right paracentral disc protrusion with subligamentous extension. It is indenting the right ventral aspect of thecal sac and encroaching upon the corresponding neural recess and exit foramen, compressing the traversing L5 nerve root (best appreciated on sagittal T2 thin cuts).