Fig. 1

MRI findings. Scanning was performed by using 3.0 T MR imaging systems (Siemens). Initial MRI findings.T2W MRI images show hyperintensities in bilateral cerebellar dentate nuclei (a), medulla oblongata (a), midbrain (b) and red nuclei (c). Coronal FLAIR images show hyperintensity in bilateral dentate nuclei (d), splenium of the corpus callosum (d), gray matter near the midbrain ducts (e) and red nuclei (f). Moreover, T2W image shows slight hyperintensity in splenium of corpus callosum (g), but DWI and ADC images only show diffusion restriction in the corresponding areas of corpus callosum (h, i). Follow-up MRI imaging was conducted 18 days after treating with GCs (22 days after discontinuation of metronidazole). T2W images (j-l) and coronal FLAIR images (m-o) show complete resolution of the previously noted signal changes. However T2W image shows higher hyperintensity in splenium of corpus callosum in axial (p). DWI and ADC images show diffusion restriction and a high ADC respectively in the corresponding areas of corpus callosum (q, r)