Hereditary Multiple Exostoses, also known as multiple congenital exostosis, is related to exostoses, multiple, type i and hereditary multiple osteochondromas. An important gene associated with Hereditary Multiple Exostoses is EXT1 (Exostosin Glycosyltransferase 1), and among its related pathways/superpathways are Glycosaminoglycan metabolism and Chondroitin sulfate/dermatan sulfate metabolism. The drug Isotretinoin has been mentioned in the context of this disorder. Affiliated tissues include bone and spinal cord, and related phenotypes are Decreased human papilloma virus 16 (HPV16) pseudovirus infection and digestive/alimentary