Fig. 4
From: Poorly differentiated adenocarcinoma with signet-ring cells in duodenal papilla: a case report
a Resected specimen. Macroscopically, there is an exposed protruded tumor (interrupted square). b The cut surface of the duodenal wall and the pancreatic head (a most anal; c most oral). From a to c, there are whitish tumors (interrupted circles). The scale divisions represent 1 mm each in a and b. c Histopathologically, the cancer cells show the pancreatic invasion with infiltrative growth and fibrosis. The most parts of the tumor are poorly differentiated adenocarcinoma, and the ratio of signet-ring cells was about 10–15% (hematoxylin-eosin, ×40, the scale bars indicate 1 mm). d, e Tumor cells contain mucin, which makes the nucleoli crescent-shaped (hematoxylin-eosin, ×600, the scale bars indicate 20 μm)