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Combined chylothorax, chylopericardium, and cranial vena cava syndrome in a dog with thymoma.

A dog was examined because of anorexia and development of submandibular, sternal, and forelimb edema. Physical examination revealed engorged jugular veins and engorged blood vessels of the conjunctivae and nictitating membranes. Thoracic radiography revealed pleural and pericardial effusions, later identified as chyle. Contrast angiography revealed an intravascular mass, later identified as thymoma, in the cranial vena cava.