Abstract
The clinical, pathologic, and immunologic features in nine cases of non-Hodgkin's lymphoma of the multilobated B-cell type are described. Clinical and phenotypic heterogeneity was observed in these B-cell neoplasms. A probable follicular center cell derivation for these cytologically unusual B-cell lymphomas is supported by antecedent histories of follicular center cell neoplasms in three cases; a focal nodular pattern in one case; the demonstration of peanut lectin (PNA) receptors, a marker for follicular center cells, on neoplastic multilobated B cells; and immunoultrastructural studies of nonneoplastic tonsillar cells that identified and characterized rare multilobated cells, immunoreactive for B1, B2, and Ia membrane antigens, a phenotype consistent with follicular center-type cells. Comparison of B- and T-cell multilobated lymphomas revealed that only immunologic studies accurately discriminated between these neoplasms.
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