DR. E. WALKER / SCIENCE PHOTO LIBRARY DR. E. WALKER / SCIENCE PHOTO LIBRARY
Subarachnoid haemorrhage. Specimen of a brain (in ventral view) showing a subarachnoid haemorrhage due to a ruptured aneurysm. The cerebellum of the brain (at left) is seen above the extensive folds of the cerebral hemispheres. Dark clots of blood from the haemorrhage occur on the brain surface. Subarachnoid haemorrhage is a bleeding into the subarachnoid space around the brain. The usual cause, as here, arrowed, is a burst aneurysm (swelling of an artery) which occurs on the circular arrangement of blood vessels at the base of the brain. This usually happens spontaneously without injury in people aged 35 to 60. Some 50% of patients survive, with surgery often required.
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