US Secretary of State Hillary Clinton is making "excellent progress" after a blood clot was found between her brain and skull, doctors say.

They said she will make a full recovery and will be released from hospital once a blood-thinning dosage has been set.

Mrs Clinton, 65, was admitted to a New York hospital on Sunday, having suffered a concussion earlier in the month when she fainted and fell over.

She is due to stand down before President Obama begins his second term.

Doctors said an MRI scan on Sunday had revealed the formation of a "right transverse sinus venous thrombosis" - a clot in the vein behind Mrs Clinton's right ear in the space between the brain and the skull.

"It did not result in a stroke, or neurological damage," said Dr Lisa Bardack and Dr Gigi El-Bayoumi, who were treating Clinton at New York's Presbyterian hospital.

The secretary of state was said to be in good spirits and "engaging with her doctors, her family, and her staff," added the doctors in a statement.

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