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Primary Cardiac Fibrosarcoma with Pulmonary Metastasis in a Labrador Retriever

Veterinary Diagnostic Laboratory, University of Minnesota, Saint Paul, Minnesota (MCS, DWH); Veterinary Clinical Sciences, University of Minnesota, Saint Paul, Minnesota (AHT); Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota (JCM)

Abstract

A 6-year-old, neutered male Labrador Retriever was diagnosed with congestive heart failure, and an echocardiogram revealed a large mass inside the pericardial sac associated with the left ventricle. At necropsy, the dog had marked ascites, mild hydrothorax, marked hydropericardium, and an 11.0 x 7.0 x 6.0 cm, tan and red, firm, well-demarcated mass attached to the left ventricular free wall. The mass was diagnosed as a fibrosarcoma based on the morphologic appearance and supportive immunohistochemical staining. To our knowledge, this is the first case report of a primary fibrosarcoma involving the left ventricular free wall myocardium, epicardium, and pericardium with a pulmonary metastasis in a dog.

Key words: Dog; fibrosarcoma; heart; immunohistochemistry; metastasis.

Dr. M C Speltz, Minnesota Veterinary Diagnostic Laboratory, 1333 Gortner Avenue, St. Paul, MN 55108, (USA). E-mail: seco0003{at}umn.edu