Solid Pseudopapillary Tumor of the Pancreas in a 50-Year-Old Man: A Case Report and Review of the Literature.

A solid pseudopapillary tumor (SPT) of the pancreas is a rare neoplasm with low malignancy, constituting about 2% of pancreatic tumors, which mainly occurs in young women. We herein report a case of a small SPT arising from the head of the pancreas in an asymptomatic 50-year-old man. This patient was admitted to our department at Henan Provincial People's Hospital for the evaluation of a pancreatic mass and a pancreatic resection was performed. Histology revealed the lesion to be an SPT of the pancreas, with the characteristic pseudopapilla formation, central degeneration, and capsule formation. The tumor was positive for vimentin, CD10, α1-antichymotrypsin, α1-antitrypsin, β-catenin, neuron-specific enolase, synaptophysin, and progesterone receptor. We diagnosed an SPT in the patient based on these histological findings and immunophenotype.