citrullinemia type I acute neonatal citrullinemia type I classic citrullinemia type 1 UMLS:C5679618 MONDO:0016600 NANDO:2201094 Acute neonatal citrullinemia type I is a severe form of citrullinemia type 1 characterized biologically by hyperammonemia and clinically by progressive lethargy, poor feeding and vomiting, seizures and possible loss of consciousness, within one to a few days of birth, with variable signs of increased intracranial pressure. The condition can lead to significant neurologic deficits. GARD:0020659 MEDGEN:1843387 Orphanet:247546 classic citrullinemia type I acute neonatal citrullinemia type 1 acute disease obsolete_acute neonatal citrullinemia type I