LIVING ART ENTERPRISES, LLC / SCIENCE PHOTO LIBRARY LIVING ART ENTERPRISES, LLC / SCIENCE PHOTO LIBRARY
This axial (cross section) MRI image of the brain shows a large left middle cranial fossa arachnoid cyst (at right, dark). This is an abnormal collection of CSF (cerebral spinal fluid) which is walled off and acts like a mass. It is benign but can cause a variety of symptoms including seizures.
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