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MRI alterations during follow-up. Contrast-enhanced, T1 weighted, fat saturated MRI demonstrating progression of two spondylitic lesions with the onset of clear erosions in the L1/L2 segment during treatment with etanercept, a TNF-α blocking agent between years 2002 and 2005. After cessation of the TNF-α blocker and initiation of antibiotic treatment, the multisegmental spondylitis regressed (year 2006).
