US Secretary of State Hillary Clinton has a blood clot in a vein between her brain and her skull, her doctors said on Monday, predicting however she should make a full recovery.

A scan on Sunday had revealed "that a right transverse sinus venous thrombosis had formed," doctors Lisa Bardack, of Mount Kisco Medical Group, and Gigi El-Bayoumi, of George Washington University, said.

They described it as "a clot in the vein that is situated in the space between the brain and the skull behind the right ear. It did not result in a stroke, or neurological damage."

Clinton was admitted to the New York Presbyterian Hospital on Sunday following the discovery and is being treated with blood thinners to dissolve the clot. She will be released "once the medication dose has been established."

"In all other aspects of her recovery, the secretary is making excellent progress and we are confident she will make a full recovery. She is in good spirits, engaging with her doctors, her family, and her staff," they added in the statement.