Fig. 4

Histopathology of resected ileum showed orange-red positivity with Congo Red staining (a); Histopathology of resected ileum with Congo Red staining showed characteristic apple-green birefringence under polarized light (b); Histopathology of resected ileum with Congo Red staining showed characteristic apple-green birefringence under polarized light after potassium permanganate pretreatment (c); Microscopic findings of the stomach biopsy and orange-red positivity with Congo Red staining (d); Characteristic apple-green birefringence under polarized light (e); Microscopic findings of the skin biopsy and orange-red positivity with Congo Red staining (f); Characteristic apple-green birefringence under polarized light (g)