Figure 2From: Constrictive pleuropericarditis: a dominant clinical manifestation in Whipple’s disease Small bowel biopsy. There is minimal histiocytic infiltration of the lamina propria (panel A, 40 ×, Tropheryma whipplei immunostain with hematoxylin counterstain). Macrophages that stain with periodic acid-Schiff (panel B, 400 ×) and Tropheryma whipplei immunostain (panel C, 400 ×) are densely aggregated in the submucosa, an unusual location in Whipple’s disease.Back to article page