Thanks for writing in.
If the physicians at the place you are currently in, have done an ultrasound
and everything is ok, you can go back home. It should be generally safe to fly with an enlarged cyst
. The only complication that can occur is torsion but it is not possible to predict when it might happen. If you are not sure, get an ultrasound of the abdomen. If its normal, you can be definitively sure that you can safely fly back.