Figure 3.Histomorphologic findings. a. Mixture of the pleomorphic large cells, histiocyte-like mononuclear cells, atypical mononuclear cells and osteoclast-like giant cells (H&E, original magnification 20x). b. As above, but mixed with epithelial neoplastic cells (H&E, original magnification 20x). c. and d. Epithelial neoplastic cells strongly positive for pankeratin and cytokeratin 34 beta E12 (original magnification 20x). e. Early intraductal growth of the undifferentiated carcinoma of the pancreas (H&E, original magnification 2x). f. Pancreatic duct almost completely occluded by intraductal growth of the undifferentiated carcinoma of the pancreas (H&E, original magnification 2x).