Granular cell tumour of the pancreas: a case report and systematic review.

"Declarations Informed consentSigned informed consent was obtained from the patient, and the form is held by the treating institution. Conflict of interestThe authors declare no competing interests. PermissionsNone. Conflict of interest The authors declare no competing interests."

"Funding Open Access funding enabled and organized by CAUL and its Member Institutions."

"A systematic review was conducted in accordance with Preferred Reporting Items for Systematic review and Meta-Analysis protocols (PRISMA) statement. Review was registered in PROSPERO ID CRD42022356253. Databases MEDLINE, EMBASE, Scopus, World of Science, PubMed, and the grey literature were searched using MeSH terms with Boolean operators “granular cell tumour” AND “pancreas” up to August 2021. Inclusion criteria included human patients with primary granular cell tumour of the pancreas confirmed on histology. Exclusion criteria were patients without histological diagnosis of GCT defined by S100 positive staining on immunohistochemistry. Full criteria in Table ."