摘要: Whole body screening with computed tomography is the focus of a major advertising campaign in United States. Enticing testimonials on billboards and radio spots urge public to use this technology, implying that there much gain little lose. How should primary care doctors advise their patients? In one sense has offer. As part study conducted by National Institutes Health, our centre used screen for lung cancer past four years identified 56 cancers. Fully 62% non-small cell cancers were stage IA.1 In absence screening, only 15-20% present at IA. Five year survival I cancers, which about 60-70%, higher than diagnosed more advanced stages. There doubt sensitive chest x ray detecting small, early We found two measuring 3 mm diameter. Recognising we patients cancer, could ask why …