Despite the recent attention in both the radiologic literature and press, screening for lung cancer is not a new idea. Lung cancer screening has been attempted as far back as the 1960s,1 and four large lung cancer screening trials2"5 were carried out in the 1970s. However, with the advent of helical computed tomography (CT), particularly multidetector-row helical CT, the possibility of accurate mass screening of at-risk populations has been revisited.