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(A) Multiple-level spondylolisthesis of L2 (Grade I posterolithesis) and L4 (Grade I anterolisthesis); (B) spondylolisthesis of L2 (Grade I posterolithesis) with formation of osteophytes probably as a mechanism to compensate for stabilization; and (C) L4 spondylolisthesis (Grade I anterolisthesis).
