Ileo-ileal intussusception caused by diffuse large B-cell lymphoma of the ileum

Figure 1 Contrast-enhanced computed tomography showing suspected right ileo-ileum intussusception with the sign of “bowel within bowel” in the ileum (A, arrow, axial view), (B, arrow, coronal view).

Figure 2 Positron emission tomography and computed tomography showing high metabolism in the right ileum (arrow) and multiple lymph nodes with high metabolism in the mesentery root of the small intestine, in which malignant lesions in the terminal ileum were suspected.

Figure 3 Endoscopic findings showing a mass approximately 50 cm away from the ileocecal valve, which almost filled the ileal cavity.

Figure 4 Histological and immunohistological examination of the endoscopic and surgical specimens showing diffuse large B-cell non-Hodgkin’s lymphoma. A: × 400, HE staining; B: × 400, CD5 (-); C: × 400, CD10 (-); D: × 400, CD20 (+); E: × 400, CD23 (-); F: × 400, MUM-1 (+); G: × 400, Bcl-6 (-); H: × 400, Cyclin D1 (-).