Thanks for using Health Care Magic..
Do not be worried about your parapelvic cyst
.. 3 cm size is smaller and it is not to be worried unless it cause severe symptoms like flank pain
and increased blood pressure ..
I suggest you to be in dietary conservative theraphy. Restrict the intake of sodium to control your blood pressure.
Avoid cigarettes and alcohol which can promote the growth of kidney cysts. Control your intake of proteins
Avoid salted foods, processed foods, pepper and seafoods.
I recommend a Surgion opinion if symptom gets increased in meantime.
Hope I Provided some useful information.
Thanks & Take Care.