| Objective To evaluate the double-phase enhanced MSCT features of non-functional pancreatic neuroendocrine tumor (NFPNET).Methods The radiological data of 24 patients with NFPNET, pathologically diagnosed in our hospitals from Jan 2009 to Dec 2015, were retrospectively analyzed. The plain, enhanced arterial and portal phase CT values in each tumor lesions were measured, and the absolute values in the arterial and portal phase enhancement range were further calculated. Then they were statistically compared with those absolute values in the pancreas parenchyma enhancement range, and the enhancement method, situation of peripheral viscera invasion or distant metastasis of NFPNET were also analyzed. Results The absolute values of arterial phase enhancement in the NFPNET and pancreas parenchyma were (59.08±34.14) HU and (53.82±15.35) HU, respectively, with no significant difference between them (P>0.05). The absolute values of portal phase enhancement in the NFPNET and pancreas parenchyma were (48.05±22.80) HU and (39.37±11.57) HU, respectively, and significant difference was found between them (P<0.05). Among the 24 NFPNET cases, 10 cases had higher arterial phase enhancement degree in the tumor lesions than that in the pancreatic parenchyma, and 14 cases had higher portal phase enhancement degree in the tumor lesions. Additionally, 3 cases presented with flocculent enhancement, 9 cases with circular enhancement, and 7 cases with wall nodular enhancement. The peripheral viscera invasion and distant metastasis were found in 8 cases. Conclusion Compared with pancreatic parenchyma, NFPNET may be relatively hyper-vascular tumors in the portal phase. The pancreatic dynamic enhanced scanning could be used as an important means for the diagnosis of NFPNET. |
