A 5-month-old male cat was admitted to a veterinary clinic with weakness, anorexia, dyspnea, dehydration, and fever on September 4, 1982. Laboratory studies revealed polycythe-mia, proteinuria and hematuria (Table 1). Cyanosis devel-oped 3 weeks after admission and persisted to the cat’s death. Treatment included antipyretics, antibiotics, antiphlogistics, and vasodilators. The cat frequently received Ringer’s so-lution and glucose, and was given cardiac stimulant for l week before death. Phlebotomy was done for 4 days before death. The tentative diagnosis was polycythemia of unknown origin. Tetralogy of Fallot characterized by interventricular septal defect, pulmonic stenosis, transposition of aorta and hyper-trophy of the right ventricle was found at necropsy. Systemic congestion and pulmonary edema were evident. Kidneys wer
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