MedicineAnatomyPathologyAnatomic PathologyAutopsy PathologyHistopathologyAmyloid FormationCongenital MalformationsGastrointestinal DiseaseVascular AnomaliesVascular MalformationsVascular PathologyAmyloidosis HistopathologyVascular Amyloid DepositionVascular Amyloidosis
A large gastric arteriovenous malformation was an incidental finding at autopsy in a 74-year-old man. Gastric arteriovenous malformations are themselves unusual, and this one was even more so, as there were massive deposits of amyloid in the walls of the constituent vessels. The nature of the amyloid was confirmed by histochemical and electron microscopic techniques. This appears to be an unusual form of localized amyloidosis.