FIG 1. A 33-year-old woman with longstanding RA on etanercept treatment, presenting with neurologic symptoms including body numbness and L’Hermitte sign.

A, Sagittal T2-weighted fat suppressed image of the left ankle shows severe peroneal tenosynovitis from the patient’s known RA.

B and C, Axial brain images from fluid-attenuated inversion recovery sequence reveal multifocal white matter lesions.

D, Midline sagittal proton attenuation weighted image of the cervical spine reveals large demyelinating lesions at the C2 and C5 levels.