Refsum Disease, Classic, also known as refsum disease, is related to peroxisome biogenesis disorder 2b and zellweger spectrum disorder. An important gene associated with Refsum Disease, Classic is PHYH (Phytanoyl-CoA 2-Hydroxylase), and among its related pathways/superpathways are Metabolism and Fatty acid metabolism. The drugs Cholic Acids and Gastrointestinal Agents have been mentioned in the context of this disorder. Affiliated tissues include eye and skin, and related phenotypes are abnormal pyramidal sign and ataxia