Abstract

Mucopolysaccharidosis type I (MPS I) is a lysosomal storage disease due to mutations within the gene IDUA encoding the “α-L-iduronidase”. The clinical manifestations concern multisystemic involvement. There are two disease modifying therapies, enzyme replacement therapy and haematopoietic stem cell transplantation (HSCT). Pulmonary haemorrhage (PH) is a rare complication of HSCT and the case was presented with the reason that the related reports were few in MPS I.