Analysis of CT imaging features of invasive and noninvasive solid pseudopapillary tumors of the pancreas
Objective The study is to investigate the CT imaging features of invasive and noninvasive solid pseudopapillary tumors of the pancreas.Methods The clinical data and CT data of 91 patients with pseudopapillary tumors of the pancreas,who were pathologically confirmed in Henan Provincial People's Hospital,from February 2017 to September 2023,were retrospectively ana-lyzed.According to the pathological results,they were divided into an invasive group(n=23)and a non-invasive group(n=68).The dif-ferences in gender,tumor location,capsule,calcification and pan-creatic duct dilatation,cystic-solid index,tumor long diameter,tu-mor and normal liver tissue plain scan,arteriovenous phase densi-ty,etc.were analyzed between the two groups.(ROC)curve,Logis-tic regression analysis and Delong test were used to evaluate the value of single or combined use of tumor long diameter,tumor vein relative enhancement,and tumor-liver vein ratio in differentiating tumors between the two groups.Results There were signifi-cant differences in tumor capsule,pancreatic duct dilatation,and cystic solidity between the invasive group and the non-invasive group(P<0.05);there were significant differences in tumor long di-ameter,tumor vein relative enhancement,and tumor-hepatic vein ratio(P<0.05).The long diameter of tumor,relative enhancement of tumor vein,and tumor-to-hepatic vein ratio alone or in combination had good discriminatory efficacy for the two groups of tumors(P<0.05).After pairwise comparison,there was no statistically significant difference in the discriminatory efficacy of each index for the two groups of tumors(P>0.05).Conclusion Compared with noninvasive SPTP,tumors in invasive SPTP is mainly composed of solid components,without capsule or incomplete capsule,pancreatic duct dilation is common,the long diameter of the lesion is smaller,and the relative enhancement degree in the venous phase is higher,which provides a strong basis for guiding clinical decision-making.
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