The individual cells range from cuboidal to columnar, with eosinophilic to amphophilic cytoplasm. The nuclear chromatin is coarse, and small, inconspicuous nucleoli are present in many tumor cells.
Mitotic figures are extremely rare to absent.
A rare glucagon positive cell is seen. A Congo red stain for amyloid is negative. The tumor is surrounded by a fibrous capsule, which is thickened in many areas. No invasion through the capsule into the surrounding parenchyma is seen. Nine peripancreatic and perisplenic lymph nodes are free of tumor.