An adult female neutered domestic shorthair cat developed right heart failure 1 week after having surgical drainage of a neck abscess of unknown etiology established at our hospital. Echocardiography revealed a large vegetative mass adhered to the tricuspid valve. Post-mortem examination revealed fibrinous endocarditis and myocarditis associated with the presence of a grass awn (Hordeum species) foreign body. Foxtail migration with subsequent thrombus and endocarditis formation on the tricuspid valve is considered a very unusual sequel to foxtail migration.
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