Table 1 Diagnostic criteria of MERS

1. Onset with neuropsychiatric symptoms, such as abnormal speech and/or behaviour, and impaired consciousness and convulsion, within 1 week after the onset of fever.

2. Complete recovery without sequelae, mostly within 10 days after the onset of neuropsychiatric symptoms.

3. High-signal-intensity lesion in the splenium of corpus callosum, in the acute stage. T1 and T2 signal changes are mild.

4. Lesion may involve the entire corpus callosum and the cerebral white matter in a symmetric fashion.

5. Lesion disappears within 1 week, with neither residual signal changes nor atrophy.