Imaging Features of Solid Pseudopapillary Tumor of the Pancreas on Computed Tomography and Magnetic Resonance Imaging

Objective:To analyze the imaging features of solid pseudopapillary tumors(SPTP) of the pancreas on computed tomography(CT) and Magnetic Resonance Imaging(MRI).Method:Retrospectively analyze the image data of a total of 11 consecutive cases with surgically and pathologically confirmed SPTP of the Pancreas.Among them,7cases underwent unenhanced and enhanced CT scan,2 cases only enhanced CT,the other 2 cases at the same time enhanced CT,plain and contrast enhanced MRI.Results:8 cases of tumor in the pancreas head and neck,2 cases in the body,1 case in the tail.The lesions are round or oval,edge rules,clear boundaries;diameter 1.8~13.2 cm,an average of 8.0 cm.2 tumors was predominantly composed of cystic portions,8 tumors were composed of similar proportions of solid and cystic portions,and 1 tumors were mainly composed of solid potions.All tumors showed mixed density in CT pre-contrast scan,solid portions and capsule of the tumors were delayed enhanced in post-contrast scan,the arterial phase showed mild to moderate enhancement,the degree of enhancement of the portal venous phase high than the arterial phase but were lower than normal pancreatic tissue,the cystic part,calcification and hemorrhage were not enhanced.Tumors showed mixed signal on MRI.On T1WI mainly is iintensity;on T2WI mainly slightly high signal,on post-contrast scan,solid portions were uneven medium delayed enhancement.Conclusion:Pancreatic solid pseudopapillary tumor is a larger more commen in young women,CT and MRI manifestations of cystic and solid mixed with complete capsule,delayed enhanced gradually filling mass,recognizing the performance of its characteristic conducive to clinical make a correct diagnosis before surgery.