U.S. Vice President Dick Cheney was released from a Washington hospital on Sunday, one day after he underwent surgery to treat aneurysms behind both knees, a spokeswoman said. "The vice president left the hospital at 10 a.m. (1500 GMT). He will work from home tomorrow. He is doing well," Cheney spokeswoman Jennifer Mayfield was quoted by Reuters as saying. Cheney shook hands with doctors and walked cautiously to a car as he left the hospital. Doctors at George Washington University Hospital operated on Cheney for six hours on Saturday, implanting tubes to help blood flow through a weakened artery. Cheney, 64, was diagnosed with the arterial aneurysms during an annual checkup in July. Doctors used local anesthesia during the surgery, according to the vice president's office. --SP 2354 Local Time 2054 GMT