Diagnostic role of endoscopic ultrasonography in defining the clinical features and histopathological spectrum of gastroenteropancreatic neuroendocrine tumors

Figure 2 The distribution of gastroenteropancreatic neuroendocrine tumors based on the primary lesion site and metastatic sites among patients with gastroenteropancreatic-neuroendocrine tumors. A: The distribution of gastroenteropancreatic (GEP) neuroendocrine tumors (NETs) based on the primary lesion site. The majority of tumors were located in the pancreas, with further sub-classification showing that most pancreatic lesions were found in the head region. These findings are based on imaging and histologic assessments; B: The distribution of metastatic sites among patients with GEP-NETs. The liver was the most common site of metastasis, accounting for 32% of all metastatic cases.