A 51-year-old woman has had several syncopal episodes over t

A 51-year-old woman has had several syncopal episodes over the past year. Each episode is characterized by sudden but brief loss of consciousness. She has no chest pain. On physical examination her vital signs show T 36.8 C, P 80/minute, R 20/minute, and BP 110/75 mm Hg. She has no pedal edema. On brain MR imaging there is a 1.5 cm cystic area in the left parietal cortex. A chest radiograph shows no cardiac enlargement, and her lung fields are normal. Her serum total cholesterol is 165 mg/dL. Which of the following cardiac lesions is she most likely to have?

A Cardiac amyloidosis

B Left atrial myxoma

C Tuberculous pericarditis

D Mitral valve prolapse

E Ischemic cardiomyopathy

B Left atrial myxoma