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Figure 6: (a) Intraoperative photograph during resection of a vestibular schwannoma, showing leptomeningeal pigmentation (black arrows) distributed along the entire tumor–brain stem interface. The pigmented pia/arachnoid extending onto the tumor surface was used as the plane of dissection. (b) Hematoxylin and eosin photomicrograph at 1,000 × magnification demonstrating the clusters of brownish melanin pigmentation (black arrow). (c) On Melan-A immunohistochemistry, the melanin-containing cells stain brown (black arrow) – 1,000 × magnification

Figure 6: (a) Intraoperative photograph during resection of a vestibular schwannoma, showing leptomeningeal pigmentation (black arrows) distributed along the entire tumor–brain stem interface. The pigmented pia/arachnoid extending onto the tumor surface was used as the plane of dissection. (b) Hematoxylin and eosin photomicrograph at 1,000 × magnification demonstrating the clusters of brownish melanin pigmentation (black arrow). (c) On Melan-A immunohistochemistry, the melanin-containing cells stain brown (black arrow) – 1,000 × magnification