BILLY SINGS ON BRAIN DISORDER

Sidelined star blames booze for crippling collapse

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Billy Joel is being treated for a buildup of spinal fluid in the brain

PIANO man Billy Joel says the brain disorder he's battling “sounds a lot worse than what I'm feeling.”

As readers know, in May Billy was diagnosed with normal pressure hydrocephalus — NPH — a buildup of spinal fluid inside the brain, a condition that can affect hearing, vision and balance, according to MedlinePlus.