There is no authoritative information to show how much time the pancreatic cyst does not change in size to be considered stable, generally 1 year without change is considered stable. If a pancreatic cyst grows several centimeters or grows rapidly within one year, the cyst is considered to be unstable. There is no way to tell how much time a pancreatic cyst will not get bigger before it is considered stable. Most pancreatic cysts are considered stable if they do not show any change within 1 year. If the pancreatic cyst grows several centimeters or even larger within 1 year, or if the pancreatic cyst grows rapidly in a short period of time, the cyst is generally unstable at this time, and may even be considered as malignant cyst. It is recommended that patients with pancreatic cysts should go to the hospital for regular checkups, and doctors will judge whether the cysts are stable or not according to the growth rate and diameter of pancreatic cysts. For pancreatic cysts that are growing too fast, patients need to consult a doctor in time, and can choose appropriate measures for treatment under the guidance of the doctor. In addition, for relatively small pancreatic cysts, they can be left untreated for the time being, but under regular observation.