Hello, I also have a pericardial cysts thats approximately 7 cm x 5 cm. My doctor accidently found the cyst when I was getting a CT scan for lower abdominal pain, not related to the cyst. Other than a few episodes with palpataions last year i haven't had any symtoms associated with the cyst. I have had many tests done and the cyst is not affecting my heart in any way. I am due for a follow up MRI and am praying that the cyst has shrunk. I have read that they can go away on there own. Unfortunatley these cysts are so rare that there aren't many clynical tests that have been done. My cardiologist has never had a patient with a cyst of my size so he has refered me to another cardiologist. No matter what, the doctor is going to recommend getting it removed because there are no studies done to show what could happen in the long run.