Morphological and ultrastructural changes in the common bile duct wall in stenting

Abstract

Aim . To carry out a comprehensive morphological study into pathological changes in the common bile duct wall following various periods of plastic and nitinol stent implantation; to examine telocytes in the common bile duct wall. Materials and methods. The study involves the material of 91 patients, who underwent surgery for periampullary carcinoma from 2014 to 2020. Plastic stents were inserted in 56 cases, nitinol stents – in 35. The study of morphological structure of the common bile duct wall took into account the type of stent and period of its implantation (14–30 days, 31–60 days, ≥ 61 days). Results . Inflammatory processes in patients with nitinol stent implantation have been revealed to prevail over fibroplastic processes, leading to hyperplasia of the common bile duct mucosa. Following plastic stents implantation, fibroplastic and atrophic changes prevailed. It was found that cases with plastic stent implantation are more often subject to damage to the telocyte ultrastructure and loss of intercellular connections. Conclusion . Structural changes in telocytes can reflect the degree of fibrosis in the common bile duct wall depending on the type of stent.