What fluids are in the uterus cyst? can they kill you ?

Uterine fluid.: There shouldn't be much fluid within the uterus. If both the tubes and the cervix are open, there shouldn't be any place for fluid to build up and remain. It can happen if the tubes are blocked, if you had surgery and the cervix is obstructed, if you have fibroids that block the cervix, or if you had surgery to remove the lining. You should be evaluated by your doctor.