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Figure 4a.  (a) Tubular adenoma of the gallbladder. Photomicrograph (original magnification, x4; H-E stain) shows a fibrovascular core lined by pyloric-type glands. (b) Papillary adenoma of the gallbladder. Photomicrograph (original magnification, x2; H-E stain) shows fingerlike processes lined by intestinal-type epithelium.