Endoscopic findings are associated with histologic types of primary small intestinal lymphoma: a retrospective study in Japan

BACKGROUND: Although endoscopic diagnosis of primary small intestinal lymphoma (PSIL) is important, the association between endoscopic findings and histologic types remains unclear. This study aimed to evaluate the diagnostic accuracy of endoscopic classifications and biopsies in PSIL. METHODS: We retrospectively reviewed 100 lesions from 49 patients with PSIL who underwent double-balloon enteroscopy between 2005 and 2020. Endoscopic findings were classified into six macroscopic types: polypoid, ulcerative, multiple nodules, diffuse, concentric stenosis, or unclassified. RESULTS: Of the 100 lesions, 47 were multiple nodules, 32 were ulcerative, 8 were polypoid, 7 were diffuse, 4 were concentric stenosis, and 2 were unclassified. Diffuse large B-cell lymphoma (DLBCL) was mainly ulcerative (72%) or polypoid (75%), whereas follicular lymphoma appeared as multiple nodules (98%) or concentric stenosis (100%) (p