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  • Title: Intracardiac malignant nonchromaffin paraganglioma (chemodectoma) in a cat.
    Author: Saunders R, Kraipowich N, Marshall HC.
    Journal: J Vet Cardiol; 2021 Oct; 37():1-7. PubMed ID: 34399378.
    Abstract:
    A 5-year-old male castrated Domestic Shorthair cat was presented to a veterinary specialty hospital for evaluation of large-volume pleural effusion. Echocardiography revealed a large intracardiac mass at the level of the interatrial septum impairing right atrial inflow resulting in lymphocytic pleural effusion and ascites. Differential diagnoses included lymphoma, hemangiosarcoma, rhabdomyosarcoma, chemodectoma, neurofibrosarcoma, myxoma, metastatic carcinoma or intracardiac thrombus, abscess or granuloma. Due to poor long-term prognosis and recurrent, large-volume pleural effusion, the cat was humanely euthanized. The heart was submitted for histopathologic evaluation. The mass was subsequently determined to be a malignant extra-adrenal nonchromaffin paraganglioma (chemodectoma) arising from the pulmonary trunk near its bifurcation in the region of the glomus pulmonale. Chemodectomas are rare in cats and to the authors' knowledge, there are no reports of one originating from the glomus pulmonale.
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