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. 2021 Jun 30;21(4):217–224. doi: 10.1093/ons/opab216

FIGURE 4.

FIGURE 4.

Fluorescence ratio and perfusion (blood flow), in which PpIX was detected with a weak intensity –40 to –20 mm. A perfusion A-peak was present –11 to –12 mm from the precalculated biopsy point. The histopathologic examination of selected biopsy points is noted in the graphs.