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![Cholangiocarcinoma: early detection and screening in high-risk population](https://image.oaes.cc/18f542db-8399-4670-a20a-2d89119b01ab/5072.fig.1.jpg)
Figure 1. Decision algorithm for CCA surveillance. aHepatocellular carcinoma surveillance with ultrasonography every 6 months. CCA: Cholangiocarcinoma; MRI: magnetic resonance imaging; MRCP: magnetic resonance with cholangiopancreatography technique.