Solitary fibrous tumor of the pancreas clinically mimicking a pancreatic neuroendocrine tumor: Cytologic pitfalls when a transgastric approach is utilized.

Solitary fibrous tumor (SFT) involving the pancreas is a rare entity often diagnosed on surgical specimens rather than cytology samples. Pancreatic SFT frequently mimics pancreatic neuroendocrine tumor radiographically, which presents unique challenges to the cytologist during rapid on-site assessment. We describe a case of pancreatic SFT with a focus on the cytologic pitfalls that might be encountered during transgastric procedures. We also review the available cytologic findings of prior pancreatic SFT cases.