Fig. 7
From: Clinical applications of diffusion weighted imaging in neuroradiology
Post-surgical ischaemia. Immediate follow-up MRI in a patient who underwent surgery for resection of a suspicious enhancing mass. In the medial aspect of the resection cavity (asterisk) there is an enhancing area on the T1 post-contrast sequence (c, arrow). This finding alone could represent residual tumour, but the presence of restricted diffusion with high signal on DWI (a) and a low ADC value (b) meant that a small area of peri-surgical ischaemia was more likely. Three-month follow-up T1 post-gadolinium MRI (d) shows absence of enhancement in the same region (arrowhead), confirming this diagnosis