The pineal gland is a small endocrine gland located in the brain. When a cyst develops on this gland, it is referred to as a pineal gland cyst. Some synonyms for this condition include cystic tumor of the pineal gland, pinealoma, pineocytoma, pineal region tumor, and pineoblastoma. These cysts are typically benign and do not usually cause any symptoms. However, in some cases, they can grow and put pressure on surrounding areas of the brain, leading to symptoms like headaches, nausea, and vision changes. Treatment may involve monitoring the cyst for growth and surgically removing it if necessary.