After spending four nights under medical supervision following a facial injury, Italian Prime Minister Silvio Berlusconi left San Raffaele hospital on Thursday morning. As he left, 73-year-old Berlusconi waved weakly at the crowd and pressed what appeared to be a white handkerchief or bandage to his face. The prime minister was hospitalized after being hit in the face with a souvenir replica of the Milan cathedral during a speech. He lost half a liter of blood, and sustained a broken nose and two chipped teeth. Berlusconi's physician said the prime minister still could not eat normally, and was in considerable pain. The physician added that Berlusconi's recent head injury had also inflamed a longstanding neck problem.