Through a comprehensive analysis of the pancreatic cystic fluid analysis, the role of the cystic fluid analysis is confirmed in terms of accurate diagnosis of pancreatic cysts, appropriate prediction of treatment response, and to select proper treatment indication through analytic results.

Inclusion Criteria:

1. patients who diagnosed with pancreatic cystic lesion
2. patients who are able to acquire cystic fluid through EUS-FNA or surgery
3. patients aged 18 years and older

Exclusion Criteria:

1. patients who did not want to participate in this study
2. patients aged under 18 years old
3. severely mentally ill patients
4. pregnant women

patients who were diagnosed with pancreatic cystic lesions and managed in Seoul National University Hospital