Fig. 2

Macroscopic findings. a Gallstones are absent but there is bile sludge in the gallbladder. Microscopic findings. b Hematoxylin and eosin staining showing diffuse deposition of eosinophilic material from the mucosal lamina propria to the subserosal layer. c Hematoxylin and eosin staining showing amyloid deposition in the peripheral nerves of the gallbladder neck. d Salmon pink-colored eosinophilic deposition in the mucosal lamina propria and muscularis propria [direct fast scarlet (DFS) staining]). e DFS staining shows the deposition exhibits apple-green birefringence under polarized light (←) in the peripheral nerves