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The probe-based confocal laser endomicroscopy images for biliary strictures: (a) thick dark bands (>40 μm) (pink arrow) in the Miami classification; (b) dark clumps (pink arrow) in the Miami classification; (c) reticular network of thin dark branching bands (<20 μm) in the Miami classification; (d) thickened reticular structure in the Paris classification (autoimmune cholangitis).
