In China, there is a serious shortage of pathologists who can perform on-site cytological diagnosis. As a result, there are few centers that can conduct ROSE in China, which limits the diagnostic accuracy of EUS-FNA to a certain extent. Previous research reports on whether endoscopists could be trained for ROSE were controversial, which may be related to the lack of standardization of the training of endoscopists. There is no training program for training endoscopists to systematically process pathological specimens, operate microscopes, read the adequacy of cytological specimens, and evaluate the atypia of cytological specimens in China. Therefore, our center intends to carry out a training for endoscopists to compare the improvement of endoscopists' ROSE operating ability before and after the training, and to evaluate the practice of each endoscopist to perform on-site rapid cytology specimens of solid pancreatic lesions.

Inclusion Criteria:

1. age ≥18 years
2. diagnosis or suspected of solid pancreatic mass based on previous imaging examination;
3. EUS-FNA is achievable.
4. signed informed consent letter

Exclusion Criteria:

1. pregnant female
2. pancreatic cystic lesions
3. anticoagulant/antiplatelet therapy cannot be suspended
4. unable or refuse to provide informed consent
5. coagulopathy (platelet count <50 ×103/uL, international normalized ration >1.5）
6. severe cardiopulmonary dysfunction that cannot tolerate intravenous anesthesia
7. with history of mental disease
8. other medical conditions that are not suitable for EUS-FNA

We plan to involve 60 patients with solid pancreatic lesion, with trained endoscopists performing ROSE in the procedure of EUS-FNA