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Thymoma in Dogs

Jul 26, 2018

Thymomas are rare tumors that arise from the epithelium (lining) of the thymus gland in the dog and cat. They are typically diagnosed in older animals, with the median age in dogs being 9 years and in cats it is 10 years. There is no breed predilection but medium and large dogs are overrepresented. Thymomas are considered benign or malignant based on their clinical features rather than on histologic (under the microscope) features. Benign thymomas do not invade into adjacent structures within the chest cavity while malignant thymomas do invade adjacent structures