Case 22-1 . Alveoli are filled with neutrophils and lined by type II pneumocytes which occasionally contain eosinophilic intranuclear inclusions bodies. Case 22-1 . Pneumonia, interstitial, subacute, with multinucleate giant cells, and few eosinophilic and basophilic intranuclear inclusions. Case 22-2 .
Crypts are tortuous and crypt epithelium is piled up and contains frequent mitotic figures.
Low numbers of macrophages and lymphocytes expand the lamina propria. Warthin Starry stain, 40x obj. Case 22-2 . There are numerous silver-positive curved bacilli within the apical zone of crypt epithelial cells. Enteritis, proliferative, subacute, diffuse, severe, with mild diffuse submucosal edema and multifocal villar fusion, crypt herniation and crypt abscesses.