Haemangioblastoma brain tumour. Magnetic resonance imaging (MRI) scan of an axial (horizontal) section through the head of a 78 year old woman showing a haemangioblastoma (bottom right). The front of the head and nose are at top. The tumour is partly solid and partly cystic (fluid-filled), affecting the left lobe of the cerebellum. Haemangoblastomas are formed from cells that line the blood vessels, are almost always benign and are usually found in the cerebellum, the area at the back of the brain that controls coordination and balance. The main symptoms, such as headaches and sight problems, arise from increased pressure within the skull. Surgery is often the main form of treatment.