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Malignant melanomas in a Duroc boar

L Thirloway, R Rudolph, H W Leipold

    Journal of the American Veterinary Medical Association
    |February 1, 1977
    PubMed
    Summary

    A Duroc boar developed malignant melanomas with widespread metastasis. The tumors showed unique cellular features, including giant cells and varied melanocyte pigmentation, despite limited anaplasia.

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    Area of Science:

    • Veterinary Pathology
    • Oncology
    • Dermatology

    Background:

    • Malignant melanoma is a significant neoplastic disease in animals.
    • Metastatic potential and histological characteristics vary widely among melanoma subtypes.
    • Understanding tumor biology is crucial for diagnosis and prognosis.

    Purpose of the Study:

    • To describe the histopathological features of malignant melanoma in a Duroc boar.
    • To document the metastatic patterns of the observed tumors.
    • To analyze specific cellular characteristics, including giant cells and melanocyte variations.

    Main Methods:

    • Gross and histopathological examination of skin tumors and metastatic lesions.
    • Microscopic analysis of tumor architecture, cellular morphology, and vascular invasion.
    • Assessment of mitotic activity and degree of anaplasia.

    Main Results:

    • The Duroc boar presented with two primary skin melanomas and extensive metastases to lymph nodes, lungs, liver, and spleen.
    • Tumors exhibited lymphovascular invasion, necrosis, numerous granular giant cells, and a mix of pigmented, lightly pigmented, and unpigmented melanocytes.
    • Limited anaplastic features and few mitotic figures were noted in the neoplastic cells.

    Conclusions:

    • This case highlights a rare presentation of malignant melanoma with extensive metastasis in a Duroc boar.
    • The presence of granular giant cells and diverse melanocyte populations represents a notable histological finding.
    • The limited anaplasia suggests a potentially slower-growing or uniquely behaving metastatic melanoma.

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