Gliomas are tumors that grow in various parts of the brain. Optic gliomas can affect:
An optic glioma may also grow along with a hypothalamic glioma.
Glioma - optic; Optic nerve glioma
Optic gliomas are rare. The cause of optic gliomas is unknown. Most optic gliomas are slow-growing and noncancerous (benign) and occur in children, almost always before age 20.
There is a strong association between optic glioma and neurofibromatosis Type 1 (NF1).
The symptoms are due to the tumor growing and pressing on the optic nerve and nearby structures. Symptoms may include:
The patient may show symptoms of diencephalic syndrome, which includes delayed growth, loss of appetite and body fat, daytime sleeping and decreased memory and intellectual function.
A neurologic examination reveals a loss of vision in one or both eyes. There may be changes in the optic nerve, including swelling or scarring of the nerve, or paleness and atrophy of the optic disc.
The tumor may extend into deeper locations of the brain. There may be signs of increased pressure within the brain (intracranial pressure). There may be signs of neurofibromatosis type 1 (NF1).
The following tests may be performed:
Treatment varies with the size of the tumor and the general health of the person. The goal may be to cure the disorder, relieve symptoms, or improve vision and comfort.
Surgical removal may cure some optic gliomas. Partial removal to reduce the bulk of the tumor can be done in many cases. This will keep the tumor from damaging normal brain tissue around the tumor.
Radiation therapy may be advised in some cases where the tumor is larger and surgery is not possible. In some cases, radiation therapy may be delayed because of the slow growth that this tumor typically displays.
Corticosteroids may be prescribed to reduce swelling and inflammation during radiation therapy, or if symptoms return.
Chemotherapy could be useful in a number of children. Chemotherapy might be especially useful when the tumor extends into the hypothalamus.
For organizations that provide support and additional information, see blindness resources.
The outlook is highly variable. Early treatment improves the chance of a good outcome. Many tumors are curable with surgery, while others return.
Normally, the growth of the tumor is very slow, and the condition remains stable for long periods of time. However, in adults and some childhood cases where the optic chiasm is involved, the tumor behaves aggressively.
Call your health care provider if you have any vision loss, painless bulging of your eye forward, or other symptoms of this condition.
Genetic counseling may be advised for people with neurofibromatosis-1. Regular eye exams may allow early diagnosis of these tumors before they cause symptoms.
Karcioglu ZA, Haik BG. Eye, orbit, and adnexal structures. In: Abeloff MD, Armitage JO, Niederhuber JE, Kastan MB, McKenna WG, eds. Abeloff’s Clinical Oncology. 4th ed. Philadelphia, Pa: Elsevier Churchill Livingstone; 2008:chap 71.