Should i be concerned about an 11cm liver cyst? what causes liver cysts?

Liver cyst: a simple liver cyst is not a problem but multiple cysts or cysts caused by an infection, malignancy need to be evaluated and treated. 5% of the population has simple cysts that are discovered by chance when a sonogram, CT scan or MRI is ordered. Cysts are small fluid filled sacs

Maybe: If there's a possibility that it's an echinococcus -- i.e., you were around a dog in sheep-raising country -- then find out whether that might be what it is. Otherwise, forget it. They "just happen". I think they're from a single dumb-luck non-cancer-style mutation in the early embryo. Unless the imaging person is concerned about malignancy, don't give the thing another thought.