Eosinophilic granuloma of lymph node: Case report with cytohistologic, immunohistochemical, and flow cytometric observations

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Abstract
A case study of eosinophilic granuloma (Langerhans cell histiocytosis) of lymph node in a 32‐year‐old white man is presented. Clinical, cytologic, histologic, immunohistochemical, and flow cytometric findings are reported. Intraoperative cytologic findings can serve as valuable adjuncts to the frozen section, in this case serving as the sole method for diagnosis. This case is presented in light of the rarity of node‐based eosinophilic granuloma and the absence of flow cytometric immunophenotypic findings in the literature.