Spleen - Pigment in a male F344/N rat from a chronic study. Multifocal macrophages with intracytoplasmic dark-brown granular pigment (arrow) are present within the splenic red pulp.
Spleen - Pigment in a female Sprague-Dawley rat from a chronic study. Macrophages with intracytoplasmic golden-brown pigment (arrow) are focally present within the splenic white pulp.