While little is known about Dwane 's clot and its location , Dr. Mary Cushman , director of the Thrombosis and Hemostasis Program at the University of Vermont and chairwoman of the American Society of Hematology 's subcommittee on quality of care , said in December that Clinton 's type of clot was called a cerebral venous thrombosis and is relatively rare . Mumford & Sons bassist had an operation for a blood clot . The blood was on the surface of his legs , the band says . Most blood clots are found in the legs , experts say .
Mumford & Sons bassist had an operation for a blood clot . The blood was on the surface of his legs , the band says . Most blood clots are found in the legs , experts say .