Synchronous colonic mucosa-associated lymphoid tissue lymphoma found after surgery for adenocarcinoma: A case report and review of literature

Figure 1 Colonoscopy. A: A 1.2 cm × 0.8 cm flat polypoid lesion in the colon; B: The lesion after submucosal injection of normal saline into the colon.

Figure 2 Histopathological findings. A: Hematoxylin and eosin (HE) staining (× 40); B: HE staining (× 100); C: HE staining (× 200); D: HE staining (× 400).

Figure 3 Immunohistochemical staining (× 100). A: Immunostaining for CD19; B: Immunostaining for CD20; C: Immunostaining for CD21 (dendritic cells); D: Immunostaining for CD23 (dendritic cells); E: Immunostaining for CD43; F: Immunostaining for CD79a; G: Immunostaining for BCL-2; H: Immunostaining for Ki67 (10% positive).

Figure 4 Immunohistochemical staining (× 100). A: Immunostaining for CD3; B: Immunostaining for CD5; C: Immunostaining for CD10; D: Immunostaining for Cyclin D1; E: Immunostaining for kappa; F: Immunostaining for lambda; G: Immunostaining for BCL-6; H: Immunostaining for EBER.

Figure 5 Whole-body maximum intensity projection ¹⁸F-fluorodeoxyglucose and positron emission tomography. A: Slightly increased fluorodeoxyglucose metabolism in the subcapsular effusion of the liver, as well as in the right upper area of the peritoneum; B: Positron emission tomography; C: Computed tomography; D: Positron emission tomography/computed tomography in axial projection showing lesions in the subcapsular effusion of the liver.