Fig. 3From: NRASQ61K mutated primary leptomeningeal melanoma in a child: case presentation and discussion on clinical and diagnostic implicationsHistological examination of tumor biopsy. Neoplasm is composed of pleomorphic cells with vescicular nuclei, eosinophilic nuclear pseudoinclusion and moderate cytoplasm (a). Immunoistochemistry shows intense positivity for MelanA (b)Back to article page