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After suffering a streptococcal throat infection, a 12-year-old immigrant boy develops cardiac symptoms that are attributed to rheumatic fever. Years later, at the age of 34 he is admitted to the hospital with pulmonary edema. Further examination reveals a diastolic murmur at the apex and mitral stenosis is diagnosed. Before surgical evaluation, which of the following findings can be attributed to mitral stenosis?

ALarge left ventricle
BIndentation of the middle third of the esophagus by an enlarged left atrium
CNotching of the ribs
DBounding, full pulse
Surgery
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