Article

Exophthalmos due to multicentric B-cell lymphoma in a goat

Veterinary Diagnostic Laboratory and Department of Biomedical Sciences, College of Veterinary Medicine, Oregon State University, Corvallis, OR, USA.
The Canadian veterinary journal. La revue veterinaire canadienne (Impact Factor: 0.52). 12/2011; 52(12):1350-2.
Source: PubMed

ABSTRACT

Multicentric B-cell lymphoma with extensive retrobulbar involvement was diagnosed in a 6-year-old Nubian goat that was presented with conjunctival swelling and exophthalmos. Serologic testing for bovine leukemia virus (BLV) was negative. Postmortem computed tomography aided in identification of the extent of soft tissue and bone lesions.

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    ABSTRACT: Of 1146 caprine necropsy or biopsy specimens submitted from 1987 through 2011 to the Veterinary Diagnostic Laboratory at Oregon State University, 100 goats (8.7%) had 102 tumors. Detailed records were available for 89 cases. Fifty-five goats were female, 17 were castrated males, and 12 were intact males. Breeds included 21 Nubian, 16 Pygmy, 10 Pygora, 8 Alpine, 4 Angora, 4 Saanen, 2 Toggenburg, and 9 crossbred goats. Dwarf, Nubian, and Saanen goats were overrepresented and Alpine and Boer goats underrepresented among cases with neoplastic disease in comparison to submissions overall. Age ranged from 7 months to 19 years (median, 7 years). Histopathology was performed on 97 tumors. Lymphoma (n = 17) was the most common tumor, followed by cutaneous squamous cell carcinoma (n = 10) and thymoma (n = 9). Most lymphomas were multicentric. All 7 mammary neoplasms were adenocarcinomas. Five of 7 vascular proliferations were hemangiosarcomas. All 4 melanocytic tumors were classified as (malignant) melanoma. Rarely reported caprine tumors included a choroid plexus carcinoma, 2 rhabdomyosarcomas, and 3 pheochromocytomas. Cutaneous round cell tumors were provisionally diagnosed as 2 histiocytomas and 5 mast cell tumors. Single cases of previously unreported caprine tumors included amyloid-producing odontogenic tumor, myxosarcoma, sebaceous carcinoma, apocrine sweat gland adenoma, and thyroid carcinoma. Nonneoplastic entities included 2 cases of mammary fibroadenomatous hyperplasia and single cases of vascular hamartoma, cervical adenomatous hyperplasia, and cervical leiomyofibromatosis. The results of this 25-year retrospective study indicate that lymphoma in particular and tumors in general are common in goats.
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