Pineal Tumors: Benign and malignant tumors that arise in the region of the pineal gland are termed "pineal tumors." There are three common types of pineal tumors; 1) gliomas; 2) germ cell tumors; 3) pineal cell tumors. The cause for pineal tumors is not known. Symptoms of pineal tumors include hydrocephalus, headache, nausea, vomiting, seizures, visual changes, or memory disturbances. Treatment of pineal tumors depends on the location and can include surgery, chemotherapy, or radiation therapy.