Case Report

Silent Tumefactive Demyelinating Lesions and Radiologically Isolated Syndrome

Figure 1

Initial imaging findings. (a) Axial fluid attenuation inversion recovery (FLAIR) image reveals a large hyperintense lesion in the left frontal lobe with surrounding vasogenic edema. (b) Axial FLAIR image shows hyperintense demyelinating lesions in bilateral subcortical white matter. (c) Sagittal T2-weighted image demonstrates T2 hypointense rim (arrow). (d) Sagittal T1-weighted postcontrast image shows ring enhancement.