Fig. 4

Brain CT and MRI of case 2. a Brain CT on admission shows a low-density spot in the right frontal lobe (red arrow) and old infarction (red arrowhead). b diffusion-weighted imaging (DWI) and fluid attenuated inversion recovery (FLAIR) images showed old infarction (red arrowhead), did not show obvious signals corresponding to the low-density spot on brain CT. c T2 star-weighted imaging (T2*WI) of MRI of case 2 on admission shows many hypointense signals in bilateral frontoparietal lobes. d T2 star-weighted imaging at 78 days after onset shows that the distribution of signals did not change compared with T2 star-weighted imaging on the admission day