The case of a 9-year-old Schnauzer male canine with a history of lack of appetite, lethargy and exercise intolerance is reported. Echocardiography was performed identifying pericardial effusion and a neoplastic mass in the pericardium. The patient presented cardiac tamponade, which was treated with pericardiocentesis. Once the patient was stabilized, a subphrenic partial pericardiectomy was performed, removing the neoplastic
mass. The histopathological diagnosis was pleomorphic pericardial rhabdomyosarcoma. The patient had a survival time of 10 weeks. For the present case, the surgical management provided sustained clinical improvement and contributed to the diagnostic process.
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