RETICULO-ENDOTHELIAL SYSTEM
The picture on the left is a low power view showing increased marrow cellularity. On the right, at high power, the cells infiltrating the marrow have the typical appearance of plasma cells.

bone marrow 1 bone marrow 2

The picture on the left shows a section of spleen stained with haematoxylin and eosin. Notice the cells present are separated by pale pink material. On the right is a similar area of spleen stained with Congo Red for amyloid.

spleen 1 spleen 2