Solitary concomitant endocrine tumor and ductal adenocarcinoma of pancreas

Figure 3 Microscopic features of solitary concomitant endocrine tumor and ductal adenocarcinoma of pancreas. A: Low-power view showing ductal adenocarcinoma (left) and endocrine tumor (right) with a fibrous band (central) clearly demarcating the two components (HE × 40); B: Pancreatic endocrine tumor composed of monotonous small, round tumor cells arranged in gyriform or trabecullar patterns, marginated by a fibrous wall (right) (HE × 100); C-E: Pancreatic endocrine tumor (right) showing positive expression while ductal adenocarcinoma (left) showing negative expression of chromogranin A, synaptophysin and glucagon (IHC × 40); F: Pancreatic endocrine tumor (left) showing negative expression while residual benign pancreatic glands (right) showing positive expression of carbohydrate antigen 19-9 (CA19-9) (IHC × 100); G and H: Higher magnifications of ductal adenocarcinoma showing bizarre pleomorphic glands (HE × 200) and immunoreactive to CA19-9 (IHC × 200).