For citations:
Turlak A.S., Kozlov A.V., Tarazov P.G., Polikarpov A.A., Popov S.A., Granov D.A. Klatskin Tumor: Difficulties in Diagnosis and Preoperative Staging. Clinical Observation. Journal of oncology: diagnostic radiology and radiotherapy. 2023;6(1):71-79. (In Russ.) https://doi.org/10.37174/2587-7593-2023-6-1-71-79