Lung cancer. Coloured three-dimensional Computed Tomography scan (CT scan) of a patient with a cancerous tumour (yellow) in a lung. Normal lung tissue is blue whilst major air passages are mag- enta. The structures around the lower lung are shown in the grey "slice" image. Lung cancer is one of the commonest & most dangerous cancers. The main causes include cigarette smoking, pollution & the spread of cancer cells from elsewhere. CT scans use thin beams of X-rays to produce images of the body. These are combined by a computer to form "slice" images through the body which can be reconstructed to form a three-dimensional model.
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