[Immunohistochemical examination of olfactory neuroblastoma]

The results of the immunohistochemical examinations by means of PAP method in 3 olfactory neuroblastomas were described. In the neoplastic cells there were cytokeratin as well as neuronal enolase. The same was recently encountered in the merkel cell tumor, which have the analogous histogenesis. The usefulness of the immunohistochemical method of examinations are essential in correct diagnosis.