im 46 year old female who has numerous problems for the most of my life.especially these last three years. seen dr back in june 2x in one week. the third time sent me to er.dr done a ct wo contrast. 4.2x4.0cm cystic mass in the right posterior fossa in the brain.possible arachnoid cyst. does anyone think i should be concerned. i made an appt. with a neuro for next month.