Pineal cyst surgery may have eye complications, intraoperative hemorrhage, postoperative hemiplegia or even coma, death and other risks. 1. Eye complications: the pineal gland has a close relationship with the eyes, if there is an accident in the pineal cyst surgery, eye complications may occur, such as eye movement disorders, diplopia and so on. 2. Intraoperative hemorrhage: the pineal gland is densely populated with blood vessels, nerves and important brain tissues, which may cause hemorrhage if the surgery is unfavorable. 3. Hemiplegia or even coma, death: the pineal gland is located between the mesencephalon and the thalamus, in the case of unsuccessful surgery, hemiplegia or even coma, death and other problems may occur. It is important to note that the treatment of pineal cysts should be chosen by the doctor based on a combination of factors, and any discomfort after the surgery should be sought in time.