Fox News senior medical analyst Dr. Marc Siegel breaks down the symptoms of Normal Pressure Hydrocephalus amid music legend Billy Joel's brain diagnosis and why it's under-diagnosed on 'Fox Report.' ...

Singer Billy Joel has been diagnosed with normal pressure hydrocephalus, leading to concert cancellations. Discover how this ...

Dr. Matthew Potts, a neurosurgeon at Northwestern Medicine, joins ABC News Live to answer questions about normal pressure hydrocephalus (NPH), the rare brain disorder impacting Billy Joel.