UPDATE: Doctors confirmed that the clot is in the vein behind Clinton's right ear in the space between her brain and skull, as revealed by an MRI. She did not suffer a stroke or neurological damage and is being treated with blood thinners. "In all other aspects of her recovery, the Secretary is making excellent progress and we are confident she will make a full recovery," said Dr. Lisa Bardack of Mt. Kisco Medical Group and Dr. Gigi El-Bayoumi of George Washington University. "She is in good spirits, engaging with her doctors, her family, and her staff."
The 65-year-old was at a follow-up exam related to a concussion she suffered earlier this month, Philippe Reines, a State Department senior advisor, said in a statement.
"Her doctors will continue to assess her condition, including other issues associated with her concussion," Reines said. "They will determine if any further action is required."
She is currently being treated with anti-coagulants at New York-Presbyterian Hospital, and will be monitored for the next 48 hours.
According to CNN, Clinton was suffering from a stomach virus earlier this month when she fainted due to dehydration, causing the concussion.
(Originally published Dec. 30, 2012, at 5:57 p.m. PT)