Medical files and electronic records were reviewed to collect information. Patients were categorized into functioning and nonfunctioning PENs based on their clinical behaviour, pathology reports and serum radioimmunoassay for offending hormones. Preoperative CT scans were used to characterize PENs and record neoplasm size and location in the pancreas. Review of operative notes was done for the type of surgery performed and peroperative findings recorded. Discharge summaries were used to study the surgical outcome in terms of duration of postoperative hospital stay and postoperative complications. Patients were followed up and any disease recurrence or disease related mortality was recorded. Evaluation of the pathology reports was done.