Image Description: The mucosa, normally forming striking folds, is atrophic, with a single layer of flattened epithelium. There is proteinaceous fluid adherent to the mucosal surface, with some bile stained orange-brown crystals toward the upper left in the lumen. The lamina propria shows fibrosis and contains a mononuclear cell infiltrate (small dark blue nuclei). The muscle is hypertrophied compared to normal gallbladder.