Eosinophilia-Myalgia syndrome associated with tryptophan.

We have reported a case of eosinophilia-myalgia syndrome associated with tryptophan ingestion. Our case meets the Centers for Disease Control surveillance definition of eosinophilia-myalgia syndrome. Our report describes clinical, laboratory, electromyographic and histologic findings that suggest this entity is a small vessel nonnecrotizing vasculitis.