FIG. 4.

Case 3. A: The cortical surface under white-light illumination. B: Under blue light, red fluorescence is evident in tumor-involved cortex. C: Under red light, longer-wavelength fluorescence represented in a false color is more extensive, corresponding to the contribution from subsurface PpIX. The location and distribution of fluorescence detected before dural opening (in Fig. 3) are consistent with those demonstrated with the dura open. D: Reconstruction of MRI data corresponding to a weighted average of the first 1 mm below the cortical surface. E: Reconstruction of weighted MRI data corresponding to the first 5 mm below the cortical surface.