
Appendix
The mucosa of the appendix resembles that of the colon; straight intestinal glands are located in the lamina propria; villi are not present. Abundant diffuse and nodular lymphoid tissue infiltrate the appendix. 400x

Mucosa
The mucosa of the appendix resembles that of the colon; straight intestinal glands are located in the lamina propria; villi are not present. Abundant diffuse and nodular lymphoid tissue infiltrate the appendix. 400x

- Intestinal glands
The mucosa of the appendix resembles that of the colon; straight intestinal glands are located in the lamina propria; villi are not present. Abundant diffuse and nodular lymphoid tissue infiltrate the appendix. 400x

- Diffuse lymphoid tissue
The mucosa of the appendix resembles that of the colon; straight intestinal glands are located in the lamina propria; villi are not present. Abundant diffuse and nodular lymphoid tissue infiltrate the appendix. 400x

- Primary lymphoid nodule
The mucosa of the appendix resembles that of the colon; straight intestinal glands are located in the lamina propria; villi are not present. Abundant diffuse and nodular lymphoid tissue infiltrate the appendix. 400x

- Secondary lymphoid nodule
The mucosa of the appendix resembles that of the colon; straight intestinal glands are located in the lamina propria; villi are not present. Abundant diffuse and nodular lymphoid tissue infiltrate the appendix. 400x