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MRI-guided focused ultrasound surgery (MRgFUS) treatment for facet joint syndrome. Osteoarthritis with facet joint involvement is shown in (a) (broken arrows). A screenshot of the MRgFUS procedure shows facet joints targeted on the MR planning image (b), and a thermal map image (c) caught during sonication highlights the thermal effect reached on the target (ablation/denervation) (courtesy of Dr Mattia Squarcia, Hospital Clinic-Centre Mèdic Alomar Barcelona, Spain).
