BSIP, CAVALLINI JAMES / SCIENCE PHOTO LIBRARY BSIP, CAVALLINI JAMES / SCIENCE PHOTO LIBRARY
Brain tumour. Original contrast and coloured CT (computed tomography) scans of a brain, showing a malignant tumour (top right of each scan). Brain tumours may be primary growths arising directly from tissues within the skull, or secondary growths spread via the bloodstream from tumours elsewhere in the body. Around 60% of primary tumours are malignant (show invasive behaviour), whereas secondary growths are always malignant. CT scanning is a diagnostic technique in which X- rays are passed through the body at different angles. A computer then produces a cross- sectional image of the tissue being examined.
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