INS and neuroendocrine neoplasm: The patient received left-sided pancreatic resection with the histological diagnosis of a well-differentiated neuroendocrine tumor (NET) of 0.6 cm that was immunohistochemically positive for chromogranin, synaptophysin, and insulin (NET G1, Ki-67 index 1%, pT1, pN0, L0, V0, Pn0, R0, G1).