t2 flair hyperintensity brain mrit2 flair brainmri t2 flair hyperintensityflair mri braint2 hyperintensity braint2 flair hyperintensityt2 hyperintense lesion in brainincreased flair signal mri braint2 flair hyperintense lesionst2 flair hyperintense signalt2 and flair hyperintense focimultiple t2 flair hyperintense lesions