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Functional MRI demonstrates regions of temporary increase of cerebral blood flow associated with thought processes or movement. Functional data superimposed on regular MRI images permits mapping of areas of the brain which can be useful in pre-surgical planning. In this case, the patient presents with a cavernous malformation of the brain.
 The patient was asked to perform a simple motor task while in the scanner, left hand finger tapping, in order to identify the area of the brain responsible for hand motion (red areas). This region was shown to be intimately associated with the cavernous malformation (white) which was being considered for surgical resection.
Techniques such as these can help determine which patients may or may not be eligible for surgery and possible risks for post-operative paralysis. (Note some plasticity of the brain with areas of the left motor cortex activated.)
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