Multicentric, moderately malignant tumors of the nonchromaffin paraganglia at the site of the aortic body, at other sites of the cardiovascular system, and in the cranial mediastinal lymph nodes were discovered incidentally at autopsy of a 7-year-old female Siamese cat. Metastases were evident grossly in the myocardium, pericardium, and cranial mediastinal lymph nodes, and histologically as tumor emboli in the stromal vessels and in epicardial, myocardial, and pulmonary lymph channels.
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