Persistent headache for 5 days, bleed ruled out on CT, assess for other etiologies, PRES may be a concern. There is mild T2 hyperintensity in the pons and periventricular white matter. There is no evidence of intracranial hemorrhage, mass, or acute infarct. There is no abnormal intracranial enhancement. 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, paranasal sinuses, and scalp soft tissues are grossly unremarkable.
Mild nonspecific signal abnormality in the pons and periventricular white matter, which may represent chronic small vessel ischemia, but no evidence of intracranial hemorrhage, classic posterior reversible encephalopathy syndrome, or acute infarct. 