Liver cyst complex cyst partially septated for 15 years scared. what does that mean?

Cysts usually benign: Given the duration, presumably imaged 15 yrs ago, it is likely a benign liver cyst. But given you have some liver tissue conditions, like fatty liver and lupus, an evaluation for other concerns from a gastroenterologist may be useful, especially if you are symptomatic now. The other issue is being scared without action, and consultation directly With your primary doctor may be in order.