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. 2018 Jun 27;53(9):1006–1034. doi: 10.1007/s00535-018-1484-9

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© The Authors 2018, corrected publication 2022

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Fig. 10 — Intraductal ultrasound (IDUS) findings. a IDUS of PSC: this image shows an irregularity of the bile duct epithelium and diverticulum-like outpouching (white arrow). b IDUS of IgG4-related SC: bile duct epithelium is smooth and preserves three-layer structure. Regular hypoechoic thickening in the inner part can be seen