Rare primary rectal mucosa-associated lymphoid tissue lymphoma with curative resection by endoscopic submucosal dissection: A case report and review of literature

Figure 1 Endoscopic findings. A: A 3.0 cm x 3.5 cm laterally spreading tumour-like elevated lesion was observed in the rectum; B: Indigo carmine staining showed a clear margin and uneven surface; C-F: Narrow band imaging (C) and magnifying endoscopy (D, E, F) showed a dark brown background and enlarged branch-like vessels on the surface of the lesion; G and H: Crystal violet staining magnifying endoscopy showed that the pit pattern structure disappeared on the surface of the lesion; I: Hypoechoic thickening of the mucosal layer was detected by endoscopic ultrasound.