[The verification of amyloidosis by biopsies of the gastric and duodenal mucosa in patients with destructive tuberculosis and chronic nonspecific lung diseases].

Biopsy of the gastric and duodenal mucosa was carried out during diagnostic esophagogastroduodenofibroscopy. Histological examination was realized using the light polarization microscope. Amyloid was found in 48.8% with pathological changes in the urine. In patients without pathological changes of the urine amyloidosis was diagnosed bioptically in 8.6% of duodenal and 10.3% of gastric biopsies.