Mucosa-associated lymphoid tissue lymphoma of the transverse colon: A case report

Figure 1 Colonofiberscopy showing the tumor’s appearance as a IIa plus IIc-like early colon cancer.

Figure 2 Biopsy specimens histologically showing diffuse proliferation of atypical small lymphocytes in the mucosal layer (A: x 40 magnification, HE) and glandular destruction (B: x 200 magnification, HE). These lymphocytes immunohistochemically showing diffusely positive staining for L-26 (C; x 200 magnification, ABC method).

Figure 3 Barium enema showing a flat and well-circumscribed tumor in the transverse colon (arrows).

Figure 4 Resected specimens showing a flat-elevated tumor with slight depression, measuring 45 mm x 30 mm in diameter.

Figure 5 The lymphoma cells mainly infiltrated into the mucosal and submucosal layers, and partly infiltrated into the muscular layer of the colon (x 20 magnification, HE).