Normal pressure hydrocephalus is a condition which typically involves urinary incontinence, imbalance, and cognitive decline. It is due to either to much production or to little reabsorption of the fluid that is in and around the brain (spinal fluid). The leg pain would not be a symptom of this. Things to ask the neurologist about would include inflammatory muscle disorders, polymyalgia rhuematica, and possible medication side effects. He may benefit from having a EMG (muscle/nerve test), and blood work for muscle ezymes and markers of inflammation. Good luck.