###Human: Are Bosniak 2F complex cysts benign? ###Assistant: Hello. Relax and do not worry. Bosniak 2F cyst is usually benign. You just need to follow-up regularly. In follow-up, they see any change to grade 3 or 4. If change is present, then you need to get it removed. So, follow up is must at the prescribed schedule. For more information consult a urologist online -->