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Owing to the growth direction of cholangiocellular carcinomas along the bile ducts, these tumors are often detected in a late stage. Klatskin tumors are mostly presented by jaundice. In cases of advanced inoperable tumors, a palliative photodynamic therapy (PDT) is possible. The aim of a PDT is a selective destruction of tumor tissue caused by the activation of photosensitizers by laser light. After the application of photosensitizers, they accumulate in the tumor and photochemistry reactionsdoi:10.1016/s2212-0971(13)70225-5 fatcat:6mvi3ypwrjartmbxgigb2pmfsa