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62-year-old female patient presented with lower back pain after facet joint prolotherapy at L3–4 level. Axial T2-weighted imaging raised suspicion of osteoarthritis of bilateral L3–4 facet joints (A). Soft tissue edema around facet joints with bone marrow edema (arrows) and linear thin epidural enhancement were observed on fat-suppressed, contrast-enhanced axial T1-weighted imaging (B).
