Therapy with Omegaven will be initiated and maintained at 1 g/kg/day in subjects with parenteral nutrition-associated cholestasis and prolonged parenteral nutrition dependence who qualify for expanded access. It will be infused intravenously through either a central or peripheral catheter in conjunction with parenteral nutrition. If additional non-protein calories are needed, they will be provided as carbohydrates. No other parenteral form of fat emulsion will be used during Omegaven therapy unless the subject is not receiving adequate calories and additional dextrose may not be administered to the subject because of severe persistent hyperglycemia, respiratory compromise, or other clinical conditions, or unless the patient develops essential fatty acid deficiency as confirmed by laboratory parameters. The same standards of care provided to all subjects receiving parenteral nutrition solution will be followed.