Amyloidosis refers to extracellular and progressive deposition of the fibrilar protein with similar microscopic and ultrastructural features. Amyloid deposits can occur in the localized (one organ) or systemic form (several organs). We report three patients which developed intraoral amyloidosis. Two of them were clinical cases which showed localized amyloidosis and another, an autopsied patient with systemic amyloidosis involving the tongue. In these three cases, the histopathologic study displayed amyloid deposits, which were confirmed with stain Congo red and apple-green birefringence under polarized light. Ultrastructural features presented fibrilar material compatible with amyloid. Although uncommon, oral cavity can be involved by amyloidosis.
Amyloidosis; Oral cavity; Histopathology; Ultrastructure
