Hurler, Scheie and Hurler/Scheie Disease are forms of Mucopolysaccharidosis Type 1 and are also known respectively as MPS IH, IS and HIS. For convenience, children most severely affected are said to have Hurler disease.
Individuals with Scheie Disease are those who are of normal intelligence and who live into adult life. Those with normal or near-normal intelligence but with more severe physical symptoms than Scheie patients are known as Hurler Scheie.
Definition from MPS Society:Hurler disease