The kind of blood clot in the skull that doctors say Hillary Rodham Clinton has is relatively uncommon but can occur after an injury like the fall and concussion the secretary of state was diagnosed with earlier this month.
Doctors said Monday that an MRI scan revealed a clot in a vein in the space between the brain and the skull behind Clinton's right ear.
The clot did not lead to a stroke or neurological damage and is being treated with blood thinners, and she will be released once the proper dose is worked out, her doctors said in a statement.
Clinton has been at New York-Presbyterian Hospital since Sunday, when the clot was diagnosed during what the doctors called a routine follow-up exam. At the time, her spokesman would not say where the clot was located, leading to speculation it was another leg clot like the one she suffered behind her right knee in 1998.
Clinton had been diagnosed with a concussion Dec. 13 after a fall in her home that was blamed on a stomach virus that left her weak and dehydrated.
The type of clot she developed, a sinus venous thrombosis, "certainly isn't the most common thing to happen after a concussion" and is one of the few types of blood clots in the skull or head that are treated with blood thinners, said neurologist Dr. Larry Goldstein. He is director of Duke University's stroke center and has no role in Clinton's care or personal knowledge of it.
The area where Clinton's clot developed is "a drainage channel, the equivalent of a big vein inside the skull — it's how the blood gets back to the heart," Goldstein explained.