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Well-differentiated low-grade pancreatic neuroendocrine tumors (PanNETs), macroscopic: solitary tumors that are well circumscribed and range in color from pink-red to tan-brown. A, Most tumors are solid. B, A small fraction can have cystic degeneration and hemorrhage. These 2 tumors were microscopically consistent with grade 2 PanNETs.
