Benign tumor is a very big concept, since it is benign, it does not have metastatic characteristics and does not affect life. However, there is a type of benign tumor that may become malignant, due to the specific site of its growth, such as growing inside the brain. However, our cranial cavity has limited space. If benign tumor grows inside the cranial cavity, it will have occupying effect and cause functional damage to the corresponding functional parts. Such benign tumors should be actively treated, while other benign tumors can be ignored, such as small cysts in the liver, which can be monitored regularly and do not need to actively seek treatment.