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Immunoblastic lymphosarcoma (ILS) is a newly recognized malignant lymphoreticular neoplasm and is included in the recent W.H.O. classification of lymphomas. This report concerns six cases of ILS studied by light, immunofluorescence (IF), and electron microscopy (EM). Four patients were female and all except one were over 50 years of age. Four patients had some immunological abnormality. Light microscopy showed a monomorphic population of immunoblasts with pyroninophilic cytoplasm and variable plasmacytoid differentiation. Intracytoplasmic IgG was demonstrated by IF in four cases, and IgA in one. Large lymphoid cells with varying proportions of polysomes, rough endoplasmic reticulum, and Golgi apparatus were seen by EM in four cases. Mean survival was 4.8 months in five cases; death in four was due to disseminated ILS. We concluded that our cases of ILS are of B cell origin, are often associated with immunological abnormalities, and carry a poor prognosis. Immunofluorescence and EM are helpful in its diagnosis.
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