Although hilar cholangiocarcinoma is relatively rare, it can be diagnosed on imaging by identifying its typical pattern. In most cases, the tumor appears to be centered on the right or left hepatic duct with involvement of the ipsilateral portal vein, atrophy of hepatic lobe on that side, and invasion of adjacent liver parenchyma. Multi-detector computed tomography (MDCT) and magnetic resonance cholangiopancreatography (MRCP) are commonly used imaging modalities to assess the longitudinal and horizontal spread of tumor.
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M. S. Mahajan, S. Moorthy, Karumathil, S. P., Rajeshkannan, R., and Pothera, R., “Hilar cholangiocarcinoma: Cross sectional evaluation of disease spectrum”, Indian Journal of Radiology and Imaging, vol. 25, pp. 184-192, 2015.