Top stories in health and medicine, November 26, 2012

This series is brought to you by MedPage Today.

1. MR Colonography Pinpoints Larger Lesions. MR colonography successfully detected larger colon polyps in high-risk patients when the imaging modality was paired with iodine-tagged limited bowel preparation and automated carbon dioxide insufflation.

2. Study Suggests Breast Cancer Overdiagnosed. As a result of mammographic screening programs, as many 1.3 million women over age 40 were overdiagnosed with breast cancer over three decades.

3. Walk Test on Par with Exercise in Heart Failure. Six-minute walk distance and exercise testing had similar prognostic value for hospitalization and mortality in outpatients with chronic heart failure.

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