While most cranial mediastinal masses are usually thymoma or lymphosarcoma, other causes may include ectopic thyroid tissue, branchial cyst, chemodectoma, or thoracic wall tumor. (randhurstanimalhospital.com)
This type of lymphoma is known as mediastinal lymphoma. (1800petmeds.com)
Clinical signs are variable and are related to a space - occupying cranial mediastinal mass and / or manifestations of the paraneoplastic syndrome. (randhurstanimalhospital.com)