Definition: The pneumoencephalogram (PEG) is a diagnostic imaging test that involves taking a series of brain scans to detect changes in the structure and function of the brain. It can be used for various purposes, including diagnosing conditions such as Alzheimer's disease, Parkinson's disease, stroke, and certain types of cancer. The PEG consists of two main components: an MRI (magnetic resonance imaging) scan and a CT scan (computed tomography). The MRI scans the brain in
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