HANS-ULRICH OSTERWALDER / SCIENCE PHOTO LIBRARY HANS-ULRICH OSTERWALDER / SCIENCE PHOTO LIBRARY
Stroke. Computer artwork of a stroke (centre) seen inside brain. Strokes (or cerebrovascular accidents, CVA) occur when a blood vessel in the brain is blocked or bursts, as here. Parts of the brain that are deprived of blood, and hence their oxygen supply, will die. Symptoms of a stroke depend on extent and location of brain damage. They vary from headaches and dizziness to paralysis and death. Strokes typically occur in the elderly and are a major cause of death.
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