A Comparative Study Between Ultrasonograhy And Computed Tomography In The Diagnosis Of Solid Pseudopapillary Tumor Of The Pancreas

Objective：To summarize the ultrasonography and CT appearances of solidpseudopapillary tumor of the pancreas (SPTP), and to explore the value ofthe ultrasonography and CT examinations in the localization, qualitativeand differential diagnosis of SPTP.Methods：The clinical data about22cases of SPTP proved by pathology wascollected including general information, preoperative ultrasound and CTexamination results and operation records and so on.Results：There were20female cases (age ranging from18to53years old,average age31.6years) and2male cases (age40and72respectively)among22patients with SPTP. The ratio of male to female was1:10.14patients (63.6%) did not have obvious clinical symptoms and foundabdominal mass after medical examinations by accident while the rest(36.4%) felt somewhat discomfortable such as abdominal pain ordistension. Each of22patients with SPTP had a single tumor.17cases(77.3%) were benign in the contrast to5cases (22.7%) with low-degreemalignant tumors. The age of patients with SPTP could contribute toidentifying benign or malignant tumor (P<0.05). The tumors were mainlylocated at pancreatic head and the size of them was larger. Most of the tumors showed round or oval, well-defined margins and solid-cysticmixed echo. In Color Doppler Flow Imaging (CDFI), blood flow was noneor a little. The tumor were located by ultrasonography as follows: pancreashead4cases, body3cases, tail3cases, body and tail3cases, abdominalcavity and retroperitoneum9cases, its localization diagnostic accuracywas59.1%. The tumor location of CT scan was as follows: both ofpancreas head and body5cases, body and tail1case, tail6cases,abdominal cavity and retroperitoneum5cases, its localization diagnosticaccuracy was77.3%. The qualitative diagnostic accuracy ofultrasonography was59.1%with13cases.18cases by CT were diagnosedcorrectly with the qualitative diagnosis accuracy of81.8%. There were nostatistically significant differences in location diagnosis of the tumors andthe internal structure of SPTP between ultrasonograhy and CT (P>0.05).There were also no statistically significant differences in the sex of thepatients, the boundary of the tumors, the dilation of pancreatic duct, andthe blood flow signal between benign and malignant tumor (P>0.05).Conclusions：The ultrasound and CT features of SPTP have some certaincharacteristic which can be used to make a preliminary diagnosis. Both ofultrasonography and CT examinations are accurate in localizationdiagnosis of SPTP. Ultrasonography can be used to determine the locationand internal structure of SPTP.