An ultrastructural study of extraskeletal Ewing's sarcoma.

摘要: A case of extraskeletal Ewing's sarcoma was studied ultrastructurally, cytologically, and cytochemically. This tumor was, as in that osseous origin, composed densely packed highly undifferentiated blastemic cells so-called "darker cells." The principal were cells, which characterized by the scant cytoplasm containing a variable amount glycogen granules, large round or oval nuclei with dispersed chromatin, rudimentary cytoplasmic junctional complexes. Some darker seemed to show somewhat histiocytic differentiation from but others degenerating. Cytochemically, no revealed presence peroxidase, lysozymes, Factor VIII-related antigen. It is likely both sarcomas extraosseous origin are defined merely glycogen.