Figure 4From: Nasal mucosal melanoma presenting as central type vertigo: a case report(A) Biopsy section showing nests of tumour cells with brownish melanin pigment within the submucosa of the nasal cavity. The arrowheads indicate the lining epithelia of the tumour mass (H&E × 400) (B) Immunohistochemistry positive stain of the tumor cells for HMB-45 marker × 400.Back to article page