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A blood clot's danger depends on where it is

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Blood clots like the one that Secretary of State Hillary Rodham Clinton is being treated for following her recent concussion can occur for a host of reasons. How serious a clot is depends on where it is and why it formed. In a statement Monday, Clinton's doctors say her clot was located in a vein in the space between the brain and the skull behind the right ear WHAT THEY ARE: Blood pools and...

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