Fig. 4

Mesenteric lymph node. A and B The architecture is multifocally effaced by randomly distributed, variably sized granulomas (A: HE, 4x, scale bar: 300 µm; B: HE, 10x, scale bar: 200 µm). Inset A: multinucleated giant cells with haphazardly arranged nuclei (foreign body type) (HE; 40x). C Abundant intramacrophagic and extracellular 1 × 3–4 µm ZN-positive bacilli are present within the granulomas (arrows; ZN 40x; scale bar: 50 µm)