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pubmed-article:2776597pubmed:abstractTextThe results of electron microscopic examination of cytologic specimens from six cases of mesothelioma and 10 cases of metastatic carcinoma of different origins are presented. The formation of cell clusters in malignant effusions from the two neoplasms has been thoroughly investigated: in mesotheliomas, cells had longer, more slender microvilli than in carcinomas and more abundant bundles of intermediate filaments; the central cavity often seen in the clusters frequently contained collagen and showed basement membrane production. The application of periodic acid-silver methenamine (PASM) and phosphotungstic acid (PTA) demonstrated a peculiar ultrastructural difference in cell coat staining in the two tumor types: in mesotheliomas, PTA and PASM were consistently negative along the outer surface of the cell aggregates, while carcinomas displayed a positive reaction either on the outer surface or on both inner and outer surfaces of the clusters. The diagnostic significance of the above-mentioned difference between the two neoplasms will require further investigation in a larger number of cases.lld:pubmed
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pubmed-article:2776597pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:2776597pubmed:year1989lld:pubmed
pubmed-article:2776597pubmed:articleTitleUltrastructural histochemistry of mesotheliomas and adenocarcinomas in malignant effusions.lld:pubmed
pubmed-article:2776597pubmed:affiliationDipartimento di Biopatologia Umana, Universita La Sapienza, Roma, Italia.lld:pubmed
pubmed-article:2776597pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:2776597pubmed:publicationTypeComparative Studylld:pubmed
pubmed-article:2776597pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed