CholangiocarcinomaCholangiocarcinoma is a malignant lesion of the bile duct epithelium. Its E l colangiocarcinoma es un tumor maligno originado en el epitelio de los conductos biliares intra o extrahepáticos. Descrito por primera vez por Durand-Fardel en 1840 1 . Es poco frecuente, representa menos del 2% de todos los tumores malignos de diagnóstico reciente. La incidencia en Estados Unidos de Norteamérica es baja, de 1.0/100.000 por año y es un poco más alta en Israel y Japón. 2 Se presenta especialmente después de la sexta década de la vida y es ligeramente más frecuente en hombres que en mujeres, en una proproción de 1,3/1 2 .El colangiocarcinoma se ubica a cualquier nivel de la vía biliar, desde los canalículos intrahepáticos hasta la ampolla de Vater 3 . Se clasifica según su localización anatómica, patrón de crecimiento y tipo histológico 4 .Anatómicamente distinguimos el colangiocarcinoma intrahepático (20% a 25%), el perihiliar (50% a 60%), el extrahepático distal (20% a 25%) y el multifocal (5%) 5 . El extrahepático también se

The most frequently used surgical technique for HH was subtotal cystectomy and the morbidity and mortality rates in this Chilean series are comparable to other national and international series.

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Hepatic hydatid disease has been reported from ancient times. It is a zoonotic infection caused by nine recognized species of tapeworms of the genus Echinococcus. Some of them are known to cause human echinococcosis, and there is reasonable doubt regarding the others. Diagnosis is supported by epidemiological history, clinical presentation, radiological imaging, and serological tests. Various pathological forms may become life-threatening, and in those cases, the treatment is extremely complex. The main objective of the treatment is to completely cure the illness in order to avoid further complications and recurrences. Hepatic surgery, using different techniques, achieves best results with acceptable morbidity and mortality rates. In the South of Chile, the geographical location in which we work, this illness is endemic with high incidence and prevalence. The hepatobiliopancreatic units of the regional surgical centers of Temuco have plenty of experience treating liver hydatid disease. In this chapter we shall focus especially on epidemiology, etiopathogenesis, diagnosis, and surgical treatment of hepatic hydatidosis.