Results are submitted of a complex structural analysis of 200 gastrobiopsies taken in those subjects with chronic gastritis who took part in the elimination of the aftermath of the Chernobyl accident, as well as in patients of a control nosologic group with no history of a radiation-factor exposure. The liquidators versus control patients demonstrated morphofunctional changes in gastric mucosa as potential manifestations of induced pathomorphosis of the condition. A number of propositions have been stated concerning features of morphogenesis of pathological processes in gastric mucosa under chronic gastritis in liquidators of the effects of the Chernobyl disaster.