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MR scans in patients after O2-O3 treatment for recurrent herniated disc. T2-weighted FSE sagittal (A) and axial (B) acquisitions before treatment showing a left L4-L5 postero-lateral herniated disc compressing and displacing the ipsilateral nerve root of L5. T2-weighted FSE sagittal (C) and axial (D) acquisitions 6 months after treatment showing a marked shrinkage of the herniated disc with a disappearance of L5 root compression.
