with hepatomegaly and hypoglycemia, espe-cially GSD type III and Fanconi–Bickel syndrome, a glucose transporter 2 transporter defect classified as GSD XI, which is not involved in the glycogen metabolism pathway (Ta b l e 1), and, possibly, GSD VI and IX. GSD I and III have several fea-tures in common, including hepatomegaly, hypoglycemia, and hyperlipidemia. However, some key differences between glycogen resembling plant-like fibers (amylopectin) accumulates in the liver.Fructose-1,6-bisphosphatase deficiency,69–71 a disorder of glu-coneogenesis, and Fanconi–Bickel syndrome (GSD XI)72–75 both have some features that may be confused with GSD I (Ta b l e 1). Because of severe hepatomegaly, lysosomal storage disorders such as Gaucher disease and Niemann–Pick type B disease may initially