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. 2021 Jan 13;11(3):259–262. doi: 10.1177/1941874420985992

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Figure 2. — Brain MRI. Axial T2-FLAIR image (A) shows interval development of a large and well-circumscribed heterogeneous iso-to-hyperintense mass in the location of the recent hemorrhagic contusion, with a rim of T2 hypointensity (hemosiderin) and a larger surrounding area of T2 hyperintensity representing vasogenic edema. This edema produces sulcal effacement laterally and medialization of the right uncus. DWI (B) and ADC (C) images show restricted diffusion within the mass. Axial MR perfusion (D) shows no elevation in cerebral blood volume associated with the right temporal mass (red/yellow = high blood volume, blue = low blood volume). Single-voxel spectroscopy of the right temporal lesion (E) shows reduction in N-acetyl aspartate (red arrow, resonance at 2.0 ppm chemical shift) and a highly elevated lactate peak (yellow arrow, resonance at 1.3 ppm chemical shift). Axial T2 FLAIR image (F) shows persistent partial opacification of the right mastoid air cells.