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Malignant lymphoma simulating lymph node toxoplasmosis

M Miettinen, K Franssila

    Histopathology
    |March 1, 1982
    PubMed
    Summary
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    Histological examination helps differentiate lymph node toxoplasmosis from malignant lymphoma and atypical hyperplasia. Key features include germinal center presence and epithelioid cell location within germinal centers for toxoplasmosis.

    Area of Science:

    • Pathology
    • Histopathology
    • Oncology

    Background:

    • Differentiating lymph node toxoplasmosis from malignant conditions like Hodgkin's disease and atypical hyperplasia (AH) is crucial for accurate diagnosis.
    • Histological examination of lymph nodes can present diagnostic challenges due to overlapping features between infectious and neoplastic processes.

    Purpose of the Study:

    • To identify key histological features that aid in distinguishing lymph node toxoplasmosis from malignant lymphoma and AH.
    • To evaluate the diagnostic utility of specific cellular and structural patterns in lymph node biopsies.

    Main Methods:

    • Histological review of 667 lymph node cases initially suspected of toxoplasmosis.
    • Analysis of diagnostic criteria, including lymph node structure, germinal center morphology, and presence/location of epithelioid cells and monocytoid cells.

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    Main Results:

    • Of 667 cases, 12 were malignant lymphoma (all Hodgkin's disease) and 15 were AH.
    • Epithelioid cells were present in all malignant and AH cases, mimicking toxoplasmosis.
    • Preserved lymph node structure and frequent germinal centers suggest toxoplasmosis, while destruction indicates lymphoma/AH.
    • Epithelioid cells within germinal centers were specific to toxoplasmosis.
    • Monocytoid cells were typical of toxoplasmosis but also seen in Hodgkin's disease/AH.

    Conclusions:

    • Histological assessment of lymph node architecture and specific cellular features, such as epithelioid cells within germinal centers, are vital for differentiating toxoplasmosis from malignant lymphoma and AH.
    • While overlapping features exist, distinct patterns can guide accurate diagnosis in challenging cases.