Fig. 3

Papillary hyperplasia of dysplasia glands (green arrow) on the surface of AH in common bile duct(red oval), with a clear boundary between AH and surface dysplasia glands (A); papillary structure of surface dysplasia glands with small vascular hyperplasia and lymphocytic infiltration visible in the papillary axis (B); surface dysplasia glands with complex papillary structures, visible multilevel papillary branches, multiple cell layers, and glandular fusion features, exhibiting sieve-like papillary structures(red arrow) with cuboidal cells and moderate cellular dysplasia (C); degenerative tissue necrosis visible on the surface of the papillae in some areas, with moderate cellular dysplasia glands and nested clusters of cells with severe dysplasia visible around the necrotic material (yellow arrow) (D)