Congenital disorder of glycosylation type 1a (CDG-Ia) is the most frequent form of CDG syndrome (see this term) and is characterized by highly variable clinical manifestations that may include feeding problems, vomiting, and diarrhea with failure to thrive in infants, and severe encephalopathy with axial hypotonia, abnormal eye movement, marked psychomotor retardation, peripheral neuropathy, cerebellar hypoplasia, stroke-like episodes, and retinitis pigmentosa in late infancy, childhood or adulthood. (Orphanet Rare Disease Ontology, Orphanet_79318)
