What exactly is Alzheimer’s disease, and how common is it? A: Alzheimer’s disease is a neurodegenerative disease that causes dementia. It is caused in part by the accumulation of abnormally folded ...

During magnetic resonance angiography, you lie flat inside the magnetic resonance imaging scanner. This is a large, tunnel-like tube. In some cases, a special dye, known as contrast, may be added to ...