How long has the lesion been stable?

Newly discovered or less than 9 years. (including lesion recently grown to >= 1.5 cm)

9 years or more.

NOT stable. There is interval growth.

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Notes:

Interval growth of cyst: For cysts < 0.5 cm, growth is represented by a 100% increase in long-axis diameter; for cysts >= 0.5 cm and < 1.5 cm, a 50% increase in long-axis diameter; and for cysts >= 1.5 cm, a 20% increase in long-axis diameter.
 

If the lesion has interval growth during the follow-up, but has been stable again since, please follow the “interval growth” follow-up algorithm.