Figure 2. A) Oviduct, focally expanded by collections of macrophages and yolk (Y) material. Note acid-fast bacilli (AFB) throughout specimens, but concentrated at the periphery (Ziehl-Neelsen [ZN] stain ×25). B) High-power magnification of periphery of oviduct containing macrophages and yolk (Y) material; AFB are concentrated at the periphery (ZN stain ×300). C) Gallbladder with papillary hyperplasia of the mucosa. Note masses of AFB in the lamina propria (LP) of the mucosa (ZN stain ×50). D) High-power magnification of the lamina propria of the gallbladder mucosa showing large numbers of AFB and heterophils (H) (ZN stain ×300).