Photomicrographs of a bronchoalveolar lavage cytospin preparation from a horse with exercise-induced pulmonary hemorrhage. A. Wright Giemsa stain. Hemosiderin is identified as brown pigment inside most of the alveolar macrophages. B. Prussian Blue stain. Perl’s Prussian Blue staining of ferric iron within the hemosiderin appears as dark blue pigment. For both images, scale bar = 20 mcm.
Courtesy of Dr. Francisco Conrado.