A 27-year-old woman has had a fever for 5 days. On physical examination, her temperature is 38.2C, pulse is 100/min, respirations are 19/min, and blood pressure is 90/60 mm Hg. A cardiac murmur is heard on auscultation. The sensorium is clouded, but there are no focal neurologic deficits. Laboratory findings include hemoglobin, 13.1 g/dL; platelet count, 233,300/mm; and WBC count, 19,200/mm. Blood cultures are positive for Staphylococcus aureus. Urinalysis shows hematuria. An echocardiogram shows a 1.5-cm vegetation on the mitral valve. Which of the following conditions is this patient most likely to develop? (A) Cerebral arterial mycotic aneurysm (B) Dilated cardiomyopathy (C) Abscess of the left upper lobe (D) Myxomatous degeneration of the mitral valve (E) Polyarteritis nodos a (F) Polycystic kidneys