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Medistinal tumours are growths that form in the mediastinum, which is the part of the chest that lies between the sternum and the spinal column, between the lungs. The most common mediastinal tumours are thymomas (thymus gland), lymphomas (lymphocytes, type of white blood cell), intrathoracic goiters (thyroid), neurofibromas (nerves) and teratomas (germ cell). About a third of mediastinal tumours are asymptomatic. Treatment for mediastinal tumours depends on the type and the symptoms; thymic cancers are treated with surgery, radiation or chemotherapy, germ tumours are treated with chemotherapy, lymphomas use chemotherapy followed by radiation and neurogenic tumours require surgery.