Usually, medical meaurements are in metric, so that should be either mm or cm. if it is cm, that is a pretty good sized cyst. Mine were measured in mm. There are several different kinds, and treatment varies. Some, they just watch as they usually go away on their own. Some kinds need to come out. Others can be treated with hormones to suppress ovarian activity.
Most ovarian cyst removel involves removing the ovary, and they don't want to do this unless it is necessary.
are the 2.8 x 3.3 x 3.6 in mm or cm or inches etc? They usually remove them surgically if they are a problem. Some can get realy big and cause pain.