MRI findings of HHV-6 encephalitis in hematopoietic cell transplant recipients

Magnetic resonance imaging of the brain for the four patients who developed limbic encephalitis, showing axial images at the level of the basal ganglia. Arrows indicate signal hyperintensities in the region of the hippocampus. Shown are T2-weighted imaging (A) and diffusion imaging (B) for patient 1 on day +21 after stem cell transplantation (SCT), 6 days after onset of neurological symptoms. (C) T2-weighted fluid attenuated inversion recovery imaging for patient 2 on day +24 after SCT, on the day of onset of neurological symptoms. (D) T2-weighted imaging for patient 3 on day +40 after SCT, 20 days after onset of neurological symptoms. (E) T2-weighted imaging for patient 4 on day +43 after SCT, 10 days after onset of neurological symptoms.