Overlap Syndromes OS are conditions in which patients have demonstrated autoimmune hepatitis AIH and also meet the clinical and histological criteria for primary biliary cirrhosis PBC or primary sclerosing cholangitis PSC 1-3.
Se denomina síndrome de sobreposición SS a aquellos casos de hepatitis autoinmune HAI comprobada que además cumplen criterios clínicos e histológicos para el diagnóstico de cirrosis biliar primaria CBP o de colangitis esclerosante primaria CEP 1-3.