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Left-right discordance with absent treatment on a side with activity as well as level discordance in a 60-year-old woman with back pain and clinical findings supporting a left upper facet joint pain generator. Mildly increased activity in the left L1–L2 facet joint (A) and marked increased activity in the right L4–L5 facet joint (B). Only the left L1–L2 facet joint underwent facet joint steroid injection.
