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Figure 1: Subjective grading of the density of leptomeningeal pigmentation, as seen under the operating microscope. (a) Minimal pigmentation seen over the optic chiasm (black arrow). (b) Moderate pigmentation (black arrows) over the brain stem, seen as multiple discrete clusters of pigmentation. (c) Extensive pigmentation seen as a carpet of dots spread over the entire optic chiasm

Figure 1: Subjective grading of the density of leptomeningeal pigmentation, as seen under the operating microscope. (a) Minimal pigmentation seen over the optic chiasm (black arrow). (b) Moderate pigmentation (black arrows) over the brain stem, seen as multiple discrete clusters of pigmentation. (c) Extensive pigmentation seen as a carpet of dots spread over the entire optic chiasm