Cortical laminar necrosis in brain infarcts: chronological changes on MRI. 
We studied the MRI characteristics of cortical laminar necrosis in ischaemic stroke.  We reviewed 13 patients with cortical laminar high signal on T1-weighted images to analyse the chronological changes in signal intensity and contrast enhancement.  High-density cortical lesions began to appear on T1-weighted images about 2 weeks after the ictus.  At 1-2 months they were prominent.  They began to fade from 3 months but could be seen up to 11 months.  These cortical lesions showed isointensity or high intensity on T2-weighted images and did not show low intensity at any stage.  Contrast enhancement of the laminar lesions was prominent at 1-2 months and became less apparent from 3 months, but could be seen up to 8 months.