Fig. 5.

Case 6. (A,B) T1-weighted image with gadolinium enhancement and FLAIR show a small enhanced tumor (recurrent malignant lymphoma, red arrow on the enlarged view of A) with perifocal edema (red dotted arrows on the enlarged view of B) at the interhemispheric surface of the right frontal base. White dotted boxes indicate the extent of the enlarged view. (C) On ASL with a PLD of 1.5 s, markedly increased signals are noted at right temporo-occipital lobe, including the hippocampus, bilateral thalami and interhemispheric surfaces of the frontal lobes as well as right frontal base. Visualization of the right fronto-parietal convexity is poor compared with that of the left side. (D) On ASL with a PLD of 2.5 s, the increased ASL signals are partly decreased. Signals of the right fronto-parietal convexity are increased, although the visualization is still poor compared with that of the left side. (E) DWI shows hyperintensity of the right frontal base (red arrows), right temporal lobe, including right hippocampus (yellow arrows) and right pulvinar of the thalamus (blue arrow). Enlarged view of the right hippocampus shows hyperintensity with the hippocampal digitations. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)