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  • Title: Cutaneous T-cell-rich B-cell lymphoma in a horse.
    Author: Hermeyer K, Seehusen F, Gehlen H, Peters M, Wohlsein P.
    Journal: Berl Munch Tierarztl Wochenschr; 2010; 123(9-10):422-4. PubMed ID: 21038813.
    Abstract:
    Cutaneous malignant lymphomas are rare in horses and comprise predominantly T-cell-rich B-cell lymphomas. They are characterized by multiple tumour nodules affecting predominantly female horses with a survival rate of months to years. At the final stage, metastases to regional lymph nodes occur, whereas widespread organ involvement is rarely reported. In this case report, a cutaneous T-cell-rich B-cell lymphoma in a 7-year-old standardbred gelding with metastases is described. Clinically, multiple cutaneous and subcutaneous nodules, enlarged superficial lymph nodes, rapid weight loss, and ventral oedema were observed. In addition to the clinical findings, necropsy revealed tumour infiltration in multiple body lymph nodes, a solitary pleural mass, and few pulmonary and intestinal tumour nodules. Microscopically, all neoplasms were composed of a densely packed cell population consisting of large lymphoblastic cells expressing CD79a, and numerous small, round, CD3-positive T lymphocytes. With respect to these findings the diagnosis of a cutaneous T-cell-rich B-cell lymphoma with metastases was made.
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