Published reports of neoplasms in Thomson's gazelles (Eudorcas thomsonii) are very rare, but thyroid tumors were the most common neoplasm of this species, accounting for 12% of reported pathologies in a 1998–2012 retrospective study of cases submitted for histologic review of grossly enlarged thyroid glands. This report describes the histological and immunohistochemical characteristics of thyroid neoplasms in 10 Thomson's gazelles from five different zoological collections. Neoplasms were submitted as biopsies from six gazelles or collected during necropsy from four gazelles. The most common clinical findings included a palpable mass on the ventral neck and progressive weight loss. Radiographic mineral density was detected in one of the neoplastic masses. Histologically, the neoplasms were classified as microfollicular thyroid adenoma (n = 2), solid thyroid adenoma (n = 2), papillary thyroid adenoma (n = 1), and solid thyroid carcinoma (n = 5). Neoplastic cells in all 10 neoplasms were positive for thyroid transcription factor 1 and thyroglobulin, but negative for calcitonin. While five cases had histologic features of malignancy, there was no evidence of metastatic disease either clinically (biopsies) or on necropsy. Numerous concurrent diseases, including cardiomyopathies and nephropathies, were present and led to choice for euthanasia in several cases.
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