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Query: UMLS:C0034186 (pyelonephritis)
 6,144 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

We studied the morphologic, antigenic, and enzymatic characteristics of the histiocytes in an isolated extranodal case of sinus histiocytosis with massive lymphadenopathy (SHML) involving the CNS. To our knowledge, this represents the first immunohistochemically documented case of CNS SHML. The histiocytes exhibited the S-100(+), CD11c(+), alpha-1-antichymotrypsin(+) immunophenotype, which suggests that the histiocytes of SHML coexpress phenotypic characteristics of histiocytes of the mononuclear phagocytic system, and histiocytes of the interdigitating reticulum cell and Langerhan cell lineages. To examine the argument that the histiocytes in SHML may represent ordinary tissue macrophages of granulomatous inflammation, we compared the immunophenotypic characteristics of the histiocytes found in SHML to those found in xanthogranulomatous pyelonephritis (XP). We found that the histiocytes of XP have immunophenotypic characteristics of histiocytes belonging to the mononuclear phagocytic system lineage. The present study demonstrates that the histiocytes of SHML are distinct from the histiocytes of another xanthogranulomatous disorder, supporting the concept that SHML is a distinct clinicopathologic entity.
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PMID:Immunohistochemical characterization of the histiocytes in sinus histiocytosis with massive lymphadenopathy: analysis of an extranodal case. 273 63

Seven cases of genito-urinary malacoplakia were analyzed histologically, ultrastructurally and immunohistochemically in a comparison with two cases of xanthogranulomatous pyelonephritis. Immunohistochemically, von Hansemann cells and Michaelis-Guttmann bodies, both hallmarks for the diagnosis of malacoplakia, showed a common antigenicity for enteropathogenic Escherichia coli as cytoplasmic granules of varying sizes. These microscopic manifestations corresponded ultrastructurally to a series of phagolysosomal degradations of coliform bacilli. Serogroups against E. coli OK antigens, which were positive for malacoplakic cells, were not confined to a particular group. Macrophages of xanthogranulomatous pyelonephritis did not show the E. coli antigenicity. Antigenicity of lysozyme and alpha-1-antichymotrypsin on the von Hansemann cells was equivocal, but these enzymes were strongly positive on macrophages of xanthogranulomatous pyelonephritis. The macrophages of both malacoplakia and xanthogranulomatous pyelonephritis were positive for antihuman macrophage antibody. These results indicate that malacoplakia depends mainly on infection by a non-specific strain of enteropathogenic E. coli and may arise from defective digestive enzyme activity of infiltrating macrophages. Immunohistochemical analysis using antisera against E. coli OK antigens, lysozyme and alpha-1-antichymotrypsin was useful in identifying the prediagnostic stage of malacoplakia and in differentiating the lesion from xanthogranulomatous pyelonephritis.
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PMID:Antigenicities of enteropathogenic Escherichia coli, lysozyme, and alpha-1-antichymotrypsin on macrophages of genitourinary malacoplakia. 778 92