<s>[INST] I have had an arachnoid cyst on the left side of my brain for about 6 years. There is a hole there as well. Just had an MRI and now I also have an arachnoid cyst on the right side. What s going on? What should I do? What should I expect? I do have tremors and have depression. Recently diagnosed with diabetes. I am 74 yr old woman. [/INST] Hello, I have gone through your question and understand your concern.Arachnoid cysts are common findings in MRI and considered incidental, generally not responsible for any symptoms at all.The tremor you are having is probably an essential type of tremor and not related to the arachnoid cyst, nor does the depression has anything to do with it.Thus, the arachnoid cyst does not need any treatment.Hope this answers your question, I wish you good health. </s>