Comparison of abdominal ultrasonographic findings with endoscopic ultrasonographic findings of solid pseudopapillary tumor of pancreas

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Purpose To compare abdominal ultrasonographic (AU) findings with endoscopic ultrasonographic (EUS) findings of solid pseudopapillary tumor (SPT) of pancreas. Methods Thirteen patients (M:F = 3:10; mean age, 36 years) with surgically proven SPT were included, who underwent both preoperative AU and EUS. Ultrasonographic findings of 2 modalities were compared according tointernal echo texture, calcification, demarcation, internal septum, and main pancreatic duct dilatation. Results Eight cases showed hypoechogenicity on both AU and EUS. Remaining 5 cases showed different echogenicity on both modalities; hypoechogenicity (n = 3) and isoechogenicity (n = 2) on AU, hyperechogenicity (n = 2), unremarkable internal echogenicity due to dense rim calcification (n = 2), isoechogenicity (n = 1) on EUS. In two cases with dense rim calcification, evaluation of the internal content was more difficult on EUS, compared to AU. Additionally, central punctate calcifications of 2 cases were well seen on both AU and EUS, but 1 case of peripheral calcification was only seen on EUS. All cases showed good demarcation without main pancreatic ductal dilatation or internal septum. Conclusions EUS was superior to AU in the evaluation of internal echo texture (solid or cystic) of pancreatic SPT. However, AU was superior to evaluate the larger size tumor and tumors with dense rim calcification.