CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
Lung cancer biopsy. Coloured computed tomography scan of a patient's chest showing a biopsy needle (blue, centre right) taking a tissue sample from a tumour (yellow and red) in the lung. The scan shows a horizontal slice through the chest. Black areas are normal lung tissue. The yellow area in the centre is the heart and its blood vessels. The spine appears in the lower centre (dark blue). Biopsies are carried out to obtain tissue samples for microscope examination. This makes it possible to establish whether a tumour is benign or, as in this case, malignant. Lung cancer is one of the most common and dangerous forms of cancer. The main single cause is cigarette smoking.
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