Histopathological changes and nematodes in the giant panda. A. Large amounts of cellular debris and mucus on the surface of the intestinal mucosa (red arrow), mixed with multiple cross-sections of adult nematodes, Baylisascaris schroederi, (black arrow) ranging in diameter from 460–500 μm to 2,100–2,300 μm. B. Extensive epithelial necrosis and infiltrates of eosinophils (black arrow) in the lamina propria. C. Cross-section of an adult female nematode (black arrow). D. Oval eggs (black arrow) about 40 μm in diameter filling in the uterus of female nematode.