An immunohistochemical study of @entity1897 , XXXX , @entity7667 , @entity808 and @entity3292 in @entity291 .

@entity1 @entity808 @entity6012 @entity5 @entity51564 @entity3292 @entity1897 @entity521 @entity7667 @entity291
Immunohistochemical analysis of five paraffin wax-embedded @entity5 was performed to elucidate the characteristics of @entity291 nervous-tissue @entity5 . In case 1 ( @entity1897 ), the neoplastic tissue was characterized by the formation of true and Homer-Wright rosettes and the existence of neuron-specific enolase. The neoplastic cells were possibly more immature than those of common @entity521 , because similar features are observed in @entity1 @entity5 . The neoplastic cells in case 2 ( @entity6012 ) ranged from large cells with abundant neurofilaments to immature small cells, rarely with neurofilaments or @entity51564 ( @entity51564 ). Such expression suggests the presence of pluripotential cells. The neoplastic tissue in case 3 ( @entity7667 ) was strikingly polymorphous, and had five elements; neuronal, astrocytic, oligodendrocytic, spindle cell and small oval cell. The neoplastic neurocytes and astrocytes were, respectively, characterized by neurofilament and @entity51564 positivity. The neoplastic oligodendrocytes made a honeycomb appearance, and the neoplastic spindle cells and small oval cells were considered to be less differentiated. The @entity5 of cases 2 and 3, which contained poorly differentiated cells and revealed both neuronal and glial differentiation, may be specific to @entity291 . In case 4 ( @entity808 ), almost all the neoplastic cells were positive for S100 protein, while S100-negative fibroblasts were present in many areas of case 5 ( @entity3292 ). These two @entity5 were readily distinguished histologically and immunohistochemically.
