Subclinical amyloid deposition in inflammatory bowel diseases: A two hospital study

Inflammatory bowel disease (IBD), which includes Crohn's disease (CD) and ulcerative colitis (UC), predominantly affects young patients and leads to intestinal complications. Amyloidosis, which involves abnormal protein deposition, is a serious complication of IBD, with a low incidence. Early detection of subclinical amyloid deposits is crucial for preventing fatal outcomes; however, routine investigations are lacking. We aimed to retrospectively examine subclinical amyloid deposition in adult patients with IBD. Surgical specimens from 249 patients with IBD were collected from the databases of two hospitals. The specimens were subjected to staining and immunohistochemistry, and clinical information was collected simultaneously. The amyloid positivity rate was 0.8 % in CD (1/131) and 0 % in UC (0/118) based on Congo red staining. The patient with amyloid deposits was a female in her 80 s who lacked a family history of amyloidosis. The subtype was amyloid A. Clinical history revealed intestinal resection in her 30 s and subsequent abdominal symptoms. To the best of our knowledge, this is the first study to collect >100 surgically examined specimens from adults with CD or UC. In older patients with a long and complex clinical course, aggressive analysis of amyloids would be better.