Err,
dont take this word for word but...
they pseudocysts are fluid that has walled off in the abdomen, causing fluid sacks. These can cause pain at times and therefore surgery may be required to solve the pain. also pseudocysts can be infectious, in that case you will need them removed and possibly the shunt too as the infection can travel up your catheter and into the brain ventricle.

people can suffer from pseudocysts and not know you have them, these ones dont tend to cause a problem, some come and go.

I hope this helps a bit x