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Thyroid pathology in canine hypothyroidism.

V M Lucke, C J Gaskell, P R Wotton

    Journal of Comparative Pathology
    |July 1, 1983
    PubMed
    Summary
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    Canine hypothyroidism is often caused by lymphocytic thyroiditis, an autoimmune disease where the immune system attacks the thyroid gland. This study examined thyroid glands from dogs with hypothyroidism, finding significant inflammation and gland destruction.

    Area of Science:

    • Veterinary Pathology
    • Immunology
    • Endocrinology

    Background:

    • Hypothyroidism is a common endocrine disorder in dogs.
    • Lymphocytic thyroiditis is a primary cause of hypothyroidism in many species.
    • Understanding the histopathological features is crucial for diagnosis and management.

    Purpose of the Study:

    • To histologically examine thyroid glands from dogs diagnosed with clinical hypothyroidism.
    • To characterize the pathological findings associated with canine hypothyroidism.
    • To compare findings with similar conditions in other species.

    Main Methods:

    • Histological examination of thyroid gland specimens.
    • Biopsy and post-mortem samples were analyzed.
    • Case series approach was utilized.

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    Main Results:

    • Six of seven dogs exhibited lymphocytic thyroiditis, characterized by significant inflammatory cell infiltration (lymphocytes, plasma cells, macrophages) and gland destruction.
    • The seventh case presented with fibrosis and minimal inflammation, potentially representing an end-stage disease.
    • Female dogs were predominantly affected, with clinical signs often appearing by two years of age.

    Conclusions:

    • Lymphocytic thyroiditis is the predominant histopathological finding in dogs with clinical hypothyroidism.
    • The findings align with previous reports on canine lymphocytic thyroiditis and similar conditions in humans and poultry.
    • Further research into the pathogenesis and genetic predispositions may be warranted.