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Progressive relapse of the ossification of the ligamentum flavum at T10-T11. (A) Preoperative view of severely ossified ligamentum flavum. (B) Postoperative view following the first operation at our institution. (C) Relapsed ossification from a small ossification medial to the T11 superior articular process, extending to the inferior articular process of T10 and along the dura mater at the same level.
