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• a  (of diseases) arising from an unknown cause
  idiopathic epilepsy

• His seizure, as well as an earlier episode that occurred 14 years ago, were described as being "benign idiopathic," meaning that their cause is unknown.
• The Government scientists studied 35 of the 3,000 Americans known to suffer from idiopathic hypogeusia.
• Eliane Zefa Corbis How best to treat idiopathic pain is one of medicine's great mysteries.

News & Articles

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• MMR Booster Vaccine Does Not Appear to Worsen Disease Activity in Children With Juvenile Arthritis
  Among children with juvenile idiopathic arthritis (JIA) who had undergone primary immunization, the use of a measles-mumps-rubella (MMR) booster compared with no booster did not result in worse JIA disease activity, according to a study in the June 19 issue of JAMA.
  June 18, 2013 - Newswise
• Lakewood businessman Ottie Ladd remembered
  Ottie Austin Ladd, a Lakewood businessman and benefactor of local causes, was remembered this week as a caring man who didn’t seek credit for his many contributions of time and money. Ladd died June 6 of idiopathic pulmonary fibrosis at age 77.
  June 14, 2013 - Tacoma News Tribune

Quotes

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• John Roberts in Forbes
  Doctors who examined the stricken Chief Justice John Roberts called the episode at his Maine vacation home a "benign idiopathic seizure," meaning they found no tumor, stroke or any other explanation.