Vice President Dick Cheney will undergo an elective surgery next weekend to treat an aneurism in an artery behind his right knee. The condition, discovered earlier this year during a routine checkup, needs to be treated "as to not become a problem over time," Steve Schmidt, counselor to the vice president, said Friday."The procedure will be performed under local anesthetic," Schmidt said. "It will take place next weekend. It will involve a short hospital stay. The vice president will return to work shortly thereafter." Schmidt said more details will be announced next week.