Doctors at NewYork-Presbyterian/Columbia University Medical Center in Washington Heights said Monday evening they are treating a blood clot in the head of Secretary of State Hillary Clinton and they expect her to make a full recovery.
Clinton, 65, was admitted to the Manhattan hospital on Saturday.
In a statement, doctors say the clot is in a vein that is between her brain and her skull behind the right ear, and it stems from a concussion she suffered earlier in December.
Doctors have prescribed blood thinners and say Clinton is "making excellent progress."
They also say the blood clot did not result in any neurological damage.
The secretary of state fainted and hit her head in mid-December after suffering from a stomach virus that left her severely dehydrated.
The illness and injury forced her to cancel a trip to north Africa and the Middle East and her testimony before Congress on the September attack on the U.S. consulate in Benghazi, Libya.
She previously suffered from a blood clot behind her knee in 1998, and she later described that as the most significant health scare she had ever faced.
Clinton had previously said she would step down from her cabinet position in January.
She is the most traveled U.S. secretary of state in history, having visited 112 countries.