[Study on diagnosis of oral mucosal melanoma with histology, electron microscopy (EM) and immunohistochemistry].

Fifteen cases of primary oral mucosal melanoma were studied with the methods of Fontana Staining, EM, and immunohistochemistry. The results showed that 4 of 15 cases were non-pigmented lesions. In these cases, two were positive with Fontana staining. Pigment body could not be found in three cases observed under EM, but all the 15 cases were positive with immunohistochemical staining. The results suggested that the immunohistochemical staining should be done for those cases suspected as non-pigment melanoma.