Reye's Syndrome is a rare but serious condition that affects the liver and brain. It is a medical emergency and requires prompt diagnosis and treatment to prevent complications. The disease mainly affects children under 15 years of age. There are no exact synonyms for the term Reye's Syndrome. It is also called Reye's disease, acute encephalopathy, Reye-like syndrome, infantile liver failure syndrome, and metabolic encephalopathy. These terms are used interchangeably to refer to the same condition. It's important to know these terms to understand what doctors are referring to when discussing this condition with you or your loved one.