Abstract
AbstractA 13‐year‐old, male, neutered Maltese presented for lethargy and anorexia. Clinical examination identified bradycardia and a grade 2/6 systolic left basilar murmur. A six‐lead electrocardiogram revealed high‐degree, 4:1 second‐degree atrioventricular block, with a rate of 40 beats per minute. Echocardiography revealed a large mass in the interventricular septum, an atypical location for a cardiac mass, as a potential cause of the arrhythmia. An epicardial pacemaker was placed and a mass within pericardium was biopsied. Histopathology revealed hemangiosarcoma. The patient was treated with chemotherapy and radiation therapy and was euthanased 2 months following diagnosis.
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