A previously healthy 26-year-old woman was seen with a progressive left-side weakness lasting 3 days. A brain magnetic resonance imaging (MRI) scan showed a right-sided mass lesion with hyperintensity in fluid-attenuated inversion recovery and T2 sequences, hypointensity in T1, heterogeneous gadolinium enhancement, and no restriction in diffusion-weighted images (Figure 1A-C).
Brandão E, Melo-Pires M, Veira C. Relapsing-Remitting Tumefactive Demyelination. JAMA Neurol. 2014;71(3):366-367. doi:10.1001/jamaneurol.2013.5