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Axial fluid attenuated inversion recovery (FLAIR) MR images of three groups with orthodontic appliances (b–d) showed artefacts caused by stainless steel brackets and archwires corresponding to hyperattenuation of the subarachnoid spaces in the FLAIR images at the level of the frontal lobe, mainly in the straight gyra and the orbital gyra. No artefacts were reported in the control group (a).
