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CASE REPORTS
JOURNAL ARTICLE
Cytomorphology of familial hemophagocytic syndrome.
Diagnostic Cytopathology 1993 August
Familial hemophagocytic syndrome (FHS) is a rare, fatal disorder of childhood demonstrating failure to thrive, fever, hepatosplenomegaly (HSM), recurrent infections, pancytopenia, and histologically, the infiltration of reticuloendothelial organs by benign-appearing histiocytes demonstrating hemophagocytosis. We report two fatal cases of FHS including a 3 year-old female who underwent fine-needle aspiration (FNA) biopsy of the liver in the initial workup of the disease (case 1) and an 8 month-old boy with ascites and HSM having peritoneal fluid cytology submitted as the first specimen for morphologic examination (case 2). In case 1, the FNA cytologic findings included benign hepatocytes and scattered mature and reactive lymphocytes and histiocytes. The histiocytes demonstrated fine to coarse cytoplasmic vacuoles and erythrophagocytosis. The diagnosis was confirmed at autopsy which revealed extensive lymphohistiocytic infiltrates in various organs including the central nervous system. In case 2, the peritoneal fluid cytology specimen contained numerous atypical and degenerating mononuclear lymphoreticular cells which were dispersed as a single cell suspension admixed with infrequent mesothelial elements; hemophagocytosis was not appreciated. Subsequent liver biopsy revealed portal tracts and sinusoids infiltrated by benign but atypical histiocytes with hemophagocytosis. Bone marrow examination and then autopsy confirmed the diagnosis of FHS. A panel of immunocytochemical studies was performed in the first case which was an aid in confirming the diagnosis of FHS and ultrastructural examination of the second case revealed well-developed erythrophagocytosis. Both patients had siblings who died of FHS. Although not diagnostic, cytomorphology may suggest FHS.
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