Thanks for your question on HCM. Kidney cyst can be malignant in some cases as it is pre malignant condition. So now your cyst might be malignant and spread to adrenal and cause adrenal mass. This is just a possibility. So to rule out this you are referred to urologist not endocrinologist. And yes removal of cyst is very dengerous as it is harmless and does not produse any symptoms. So better to avoid surgery. Now you may need biopsy to confirm malignancy. So consult urologist and discuss all these.