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.