Figure 12.

Non-Hodgkin B-cell lymphoma. (a) Photograph of resected ileal loops and mesentery from a 53-year-old man who presented with abdominal pain and small bowel occlusion shows a bulky, necrotic lymphadenopaty (arrow) and extensive amorphous, neoplastic infiltration of ileal walls and mesentery (asterisk). (b) Low-power photomicrograph (magnification ×4; haematoxylin-eosin stain) demonstrate effacement of mucosa by lymphoid cell infiltrate (asterisk) and adjacent, normal intestinal mucosa. (c) High-power photomicrograph (magnification ×400; haematoxylin–eosin stain) demonstrate large B cells infiltrating glandular crypts.