PMC7237124_01
MR at baseline (T0). Image of the lumbar spine in T2 sequences; red circle highlights the L5-S1 facet joint with evidence of osteoarthritis with effusion.
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After physical examination, MRI of the lumbar spine demonstrated FJS (L5-S1) but also revealed an arthrogenous cyst of the left facet of L5-S1 compressing the root of S1 (Figure 1).
MR after 6 months (T4). Image of the lumbar spine in T2 sequences; red circle highlights the L5-S1 facet joint with evidence of osteoarthritis without effusion.
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At T4, MRI of the lumbar region was done (Figure 2).