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81-year-old with radicular pain from L5-S1 facet cyst. Pre-lesioning MRI shows left facet cyst with marked medial foraminal stenosis. Six-week postprocedure MRI shows soft part of cyst signifcantly reduced (red arrow). A small residual 'hook' spur off the medial edge of the inferior facet and less fluid in the facet joint (yellow arrows).
MRI: Magnetic resonance imaging.
