A retinoblastoma is a cancerous tumor on a part of your child’s eye called the retina. It sounds scary, but it’s highly curable if you catch it early.
What Causes It?
Your child’s eyes begin to develop very early in the uterus. Cells called retinoblasts grow until they form their retina. This is the part in the back of their eye that senses light.
Sometimes something goes wrong. The cells don’t stop growing and a tumor forms on their retina. The tumor may grow until it fills the inside of their eyeball. Cancer cells can break off and spread to other parts of their body.
Who Gets It?
Mostly children 5 years old and under. It rarely affects adults. Between 200 and 300 children are diagnosed each year. A little less than half of all cases are inherited. That means the gene that makes the cells grow is passed from parent to child. Most of the time retinoblastomas only affect one eye. Inherited cases are more likely to affect both eyes.
What Are the Symptoms?
You might notice:
- Their pupils look white -- not red -- when you take pictures of them. Blood vessels in the back of their eye should reflect red. If they don’t, there could be a tumor.
- Their eyes don’t move or focus in the same direction.
- They act like their eyes hurt.
- Their pupils are always wide open.
- One or both eyes are often red.
How Is It Diagnosed?
Their doctor will check their eyes. If they see some of the signs noted above, they might order an imaging test to look for tumors.
If they think your child has a retinoblastoma, they’ll tell you to take them to an ophthalmologist -- a doctor who surgically treats eyes. That doctor will use special equipment to look at their retina. They may do tests to figure out the stage of the tumor, or how far it has spread. These tests include ultrasound, MRI scans, CT scans, bone scans, a spinal tap, and bone marrow tests.
What Are the Stages of Retinoblastoma?
- Intraocular retinoblastoma. The earliest stage, found in one or both eyes. It hasn’t spread to tissue outside the eye.
- Extraocular retinoblastoma. The cancer has moved outside of their eye to other parts of their body.
- Recurrent retinoblastoma. The cancer has returned. It could be in the eye or in other parts of the body.
How Is It Treated?
Because it’s usually found before it spreads outside of the white of the eye, this cancer is highly curable. Many types of treatment can save your child’s sight. Your doctor will choose treatments based on the stage of cancer at the time of diagnosis. Options include:
- Photocoagulation. A laser kills blood vessels that feed the tumor.
- Cryotherapy. Extremely low temperatures kill cancer cells.
- Chemotherapy. This medicine helps to kill or slow the growth of cancer cells. Your child may get it in a few ways:
- Injected into a vein (the doctor will call this intravenous)
- As a pill
- Injected into the fluid that surrounds their brain and spinal cord (called intrathecal chemotherapy)
- Radiation therapy. It can be given two ways: from inside their body (internal) or outside (external). External-beam radiation therapy uses X-rays to kill cancer cells. In internal, or local radiation therapy, the doctor places small amounts of radioactive material inside of or near the tumor to kill cancer cells.
- Surgery. The doctor surgically removes their eye.
What’s the Outlook After Treatment?
Over 90% of children will live more than 5 years after being diagnosed with retinoblastoma. How much eyesight they have depends on how severe the disease was, as well as the treatment they received.
Inherited forms of retinoblastoma are more likely to come back years after treatment. Children who have had it need close follow-up after treatment.
Can It Be Prevented?
Because genetics and age play such large roles in this condition, the best prevention is through finding it early. All babies should have a general eye exam at birth and then again during the first year of life. (These are usually included during the "well-child" visits scheduled at 2, 4, 6, 9, and 12 months.) Your child should also have regular exams scheduled for 15, 18, and 24 months of age and every year after that.
At these visits, their doctor can spot any serious problems and check for the retinal tumors. Newborns with a family history of retinoblastoma should have a more thorough eye exam at birth, again at several weeks of age, and then once every few months as directed by the doctor.
Note: If you notice something unusual about your child's eyes in between the regular visits, contact your doctor for an appointment immediately.
If your family has a history of retinoblastoma, a blood DNA test can look for the gene mutation that causes it.