Federal charges have been dropped against a Westchester County neurologist who was among six charged in an alleged $57 million health care fraud scheme that spanned more than a decade. The U.S. Attorney's Office has dropped the case against Emad Soliman, a New Castle resident who practices in Yonkers who had been charged in an alleged 12-year-scheme to "defraud Medicaid, Medicare and other private health insurance companies out of more than $50 million."