SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Coloured digital angiogram (X-ray) of the brain in front view, showing a malformation of the left internal carotid artery (red, at top). Also known as a cerebral arteriovenous malformation (AVM). Symptoms may range from mild headaches to uncontrollable Grand Mal seizures.
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