Creutzfeldt-Jakob disease. Coloured Magnetic Reso- nance Imaging (MRI) scan of the brain of a 17 year old male suffering from Creutzfeldt-Jakob disease (CJD: new variant) in 1997. The patient died. The front of the head is at top. In this axial 'slice' through the brain, the folded cerebrum is seen forming two hemispheres. At lower centre are two green areas of the thalamus diseased with CJD. It is detected as a 'bilateral signal abnormality' on MRI. CJD destroys nerve cells and causes brain tissue to become spongy. Symptoms include dementia and muscle contractions, & death. There is concern that eating beef from 'mad cows' may cause CJD.

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