History of breast cancer, presenting with dizziness, headache, ataxia
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Subarachnoid FLAIR hyperintensities are present along the cerebral convexity, occipital lobe, and along the cerebellar folia. There is also a perimesencephalic hyperintensity.
After gadolinium injection, there is enhancement of the subarachnoid spaces, perimesencephalic, and cerebellar folia (leptomeningeal enhancement).
It's necessary to evaluate these hyperintensities with information from the other sequences, in order to make a diagnosis. In this case, enhancement on T1 with gadolinium suggests leptomeningeal carcinomatosis.