Introduction
Severe hypercholesterolemia mediated by graft-versus-host disease (GVHD) of the liver in patients underwent allogeneic hematopoietic stem cell transplantation (HSCT) is a recognized yet overlooked phenomenon. Reports in literature is limited in both adult (1-3) and pediatric population (4) and none has been reported in Chinese children to date. Here reports 2 cases of lipoprotein X (Lp-X) hypercholesterolemia due to liver GVHD post-HSCT in Hong Kong.