History of Guillain Barre with unilateral right-sided retroorbital headache (sharp pain without radiation). Follow-up of abnormal left hippocampal signal abnormality. Mildly elevated T2 hyperintensity and minimal thickening of the left hippocampus head and body are unchanged. This is not associated with abnormal contrast enhancement or diffusion restriction. The remainder of the brain, including the right hippocampus, is normal. There is no evidence of intracranial hemorrhage or acute infarct. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The orbits, skull, and scalp soft tissues are grossly unremarkable. There is mild mucosal thickening in the paranasal sinuses without fluid.
Mild thickening and increased T2 signal involving the left hippocampus remain unchanged. The followup interval is probably to short to confidently discriminate between noninfectious/autoimmune encephalitis and a neoplastic process (such as low-grade glioma) though infectious encephalitis is unlikely at this point. A follow-up examination in 2-3 months is suggested. 