Cardiomyopathy, Cardiorespiratory arrest, Congestive heart failure, Decreased liver function, Decreased plasma carnitine, Depressed nasal bridge, Developmental cataract, Difficulty climbing stairs, Dysphagia, Dyspnea, Electron transfer flavoprotein-ubiquinone oxidoreductase defect, Elevated circulating acylcarnitine concentration, Elevated circulating creatine kinase concentration, Elevated circulating hepatic transaminase concentration, Encephalopathy, Ethylmalonic aciduria, Exercise intolerance, Exercise-induced muscle fatigue, Fatigable weakness of neck muscles, Feeding difficulties, Generalized aminoaciduria, Gliosis, Glycosuria, Gray matter heterotopia, Hepatic periportal necrosis, Hepatic steatosis, Hepatomegaly, High forehead, Hyperammonemia, Hyperlordosis, Hypoglycemia, Hypoglycemic coma, Hypotonia, Inability to walk, Increased circulating lactate dehydrogenase concentration, Increased intramyocellular lipid droplets, Jaundice, Lactic acidosis, Lacticaciduria, Macrocephaly, Metabolic acidosis, Muscle weakness, Myalgia, Nausea, Pachygyria, Phenotypic abnormality, Polycystic kidney dysplasia, Poor head control, Proximal muscle weakness, Proximal tubulopathy, Pulmonary hypoplasia, Renal cortical cysts, Respiratory distress, Respiratory insufficiency, Restrictive ventilatory defect, Reye syndrome-like episodes, Rhabdomyolysis, Scapular winging, Seizure, Skeletal muscle atrophy, Telecanthus, Vomiting, Wide anterior fontanel