Structural or metabolic epilepsy may result from brain malformations such as angioma, or AV malformation, shown on this dorsal view MRI. Abnormal cerebral blood vessels (in white) form a balloonlike structure (blue area at lower right) that caused the death of brain tissue around it in the right occipital cortex.
Simon Fraser/Royal Victoria Infirmary/Newcastle Upon Tyne/Science Photo Library/Science Source