Photomicrographs of tissue samples of the affected epididymis of the bull of Figure 1. A—Within areas of the epididymis with markedly dilated ducts separated by abundant organizing collagen and inflammation, there are well-demarcated, inflammatory foci composed of central accumulations of neutrophils, eosinophils, and eosinophilic coagulum surrounded by a palisading, circumferential layer of epithelioid macrophages and a few multinucleated macrophages. The surrounding stroma contains numerous dense perivascular infiltrates of plasma cells, lymphocytes, and a few neutrophils and eosinophils. B—Within the center of inflammatory foci, there are a few spermatids intermixed within clumps to sheets of pyknotic cells that consist of degenerate eosinophils and neutrophils. H&E stain; bar = 100 and 20 μm for panels A and B, respectively.
Citation: Journal of the American Veterinary Medical Association 252, 10; 10.2460/javma.252.10.1217