Fig. 1

Pig. Colon. a Normal colon lined by columnar epithelial cells. b Superficial, erosive colitis with infiltration of neutrophils into the lamina propria and effusion into the lumen – ‘volcano lesion’ (arrow) (Haematoxylin and eosin 20×)
Pig. Colon. a Normal colon lined by columnar epithelial cells. b Superficial, erosive colitis with infiltration of neutrophils into the lamina propria and effusion into the lumen – ‘volcano lesion’ (arrow) (Haematoxylin and eosin 20×)