Figure 3. Example of cortical mapping in patient 5.

Figure 3 shows in patient 5 the results of word (R yellow) and pseudo word reading (R white) mapping in a patient who had an arteriovenous malformation within the posterior part of the Sylvian fissure. Word reading (A) involved the posterior part of supramarginal gyrus and T1 gyrus whereas pseudo word reading (B) involved anterior part of supramarginal gyrus. To improve the understanding of the intraoperative pictures, cortical sites producing no reading interference (Negative area = N) were not systematically noted by a sterile ticket. These sites were extremely localized in small areas of the cortex. In this case, as seen in the 3D reconstruction of patient’s brain (in C) strict segregation of the areas involved in word or pseudo-word reading was found.