Solid pseudopapillary tumor of the pancreas: a case series of 9 patients.

Background/aims: Solid pseudopapillary tumor is a rare exocrine tumor of the pancreas. There is no clear consensus on its etiology, origin and treatment. In this study, the clinical, pathological and immunohistochemical features of nine patients with solid pseudopapillary tumor were re-evaluated in view of the current literature findings.