brain cancer cell brainstem glioma cell 2010-09-29T08:43:21Z BTO:0004735 BrendaTissueOBO This primary brain tumour occurs in the pons or the medulla. They account for approximately 15% of brain tumours in children. Symptoms include double vision, facial weakness, vomiting and difficulty walking. Surgery is difficult due to location so radiation therapy and chemotherapy are used. Overall survival is 20 to 30%. mgr