Fig. 4

H&E staining of PS tissues from 4 different patients carried elevated CA19-9. A In the patient with CA19-9 of 1200 IU/ml, the alveoli walls were severely crushed and the alveolar space filled with inflammatory cells. B, C A moderate degree of inflammation was found in the specimen of the 2 patients with serum CA19-9 of 866 IU/ml and 665 IU/ml, respectively. D In the patient who has a CA19-9 of 458 IU/ml, the normal alveolar structure could be observed and less inflammatory cells in alveolar space and septum