CENTRE JEAN PERRIN / ISM / SCIENCE PHOTO LIBRARY CENTRE JEAN PERRIN / ISM / SCIENCE PHOTO LIBRARY
Brain activity in Benson's syndrome. Coloured positron emission tomography (PET) axial scans comparing the activity in a healthy brain (right) and the brain of a 60-year-old male patient with posterior cortical atrophy, or Benson's syndrome (left). Benson's syndrome is a rare atypical form of Alzheimer's disease. It causes atrophy (wasting) of the posterior region of the cerebral cortex, resulting in the progressive disruption of complex visual processing. The radioactive tracer used was F18-FDG.
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