Retinoblastoma 101

You may first notice something small. A flash photo shows a white glow. One eye starts to drift, or a pupil looks cloudy.

Most eye changes in young children are not cancer. Retinoblastoma is one rare reason a change deserves prompt attention. This guide is for parents, caregivers, and adult survivors who want a steady explanation of what usually happens next.

Retinoblastoma is a pediatric cancer, so the plan is led by a children's specialty team. Our role at ACTC is different. We help adult survivors who need long-term follow-up close to home in Brooksville, Spring Hill, and Weeki Wachee.

What Retinoblastoma Is and Who It Affects

If a doctor has used the word retinoblastoma, the first question is usually simple. What is this, and how serious is it for my child?

Retinoblastoma is a rare cancer that starts in the retina, the layer at the back of the eye. About 300 to 350 new cases are diagnosed in the United States each year, per the American Cancer Society (2025). It mostly affects children younger than 5, and about two-thirds are diagnosed before age 2.

The cancer can involve one eye or both eyes. About 1 in 3 children have both eyes affected. Disease can stay inside the eye, or it can spread beyond it, and the plan depends on which picture the team is looking at.

Warning Signs Parents Should Not Ignore

If something about your child's eye looks wrong, trust that instinct. A photo finding or new crossed eye may have another cause. It still deserves prompt evaluation by a pediatric eye specialist.

Warning signs to bring up right away include:

• White pupil or white glow: A white reflection in the pupil, especially in flash photos, is sometimes called leukocoria.

• Crossed or misaligned eyes: One eye may turn inward, outward, up, or down.

• Vision changes: Your child may bump into things, stop reaching accurately, or favor one eye.

• Red, painful, or swollen eye: Ongoing redness, pain, or swelling should not be brushed off.

• Cloudy pupil: The front of the eye may look hazy or different from the other eye.

• Eye that looks larger: One eye may appear bigger than the other in advanced cases.

For sudden vision loss or severe eye pain, call 911 first. For other signs on this list, call your pediatrician or a pediatric eye specialist the same day.

How Doctors Confirm the Diagnosis

Families often want one quick test that gives a clear yes or no. With retinoblastoma, diagnosis usually starts with a careful eye exam by a pediatric eye specialist, not a single scan.

A specialist will look directly at the retina with a dilated exam. In very young children, that exam is often done under anesthesia so both eyes can be checked safely. The pattern inside the eye often guides the diagnosis.

Imaging may be added when the team wants a clearer picture:

• Ultrasound of the eye: A quick, painless scan that can show features of a mass inside the eye.

• Magnetic resonance imaging: An MRI looks at the optic nerve and nearby tissue without using radiation.

• CT scans: These are used selectively, since the team often limits radiation exposure in heritable cases.

Tumor biopsy is usually avoided because sampling can risk spreading cancer cells. Diagnosis is built from the exam, imaging, and the genetic picture.

Hereditary Versus Nonhereditary Retinoblastoma

A diagnosis often raises a quiet second question. Was this passed down, and what does it mean for siblings or future children?

About 4 in 10 cases are heritable, meaning an RB1 gene change is present throughout the child's body. Sometimes that change is passed down from a parent, and sometimes it is new, so a genetic counselor matters even without a family history.

Heritable disease often shapes a few practical next steps:

• Closer follow-up for your child: More frequent eye exams may be recommended for a time.

• Targeted screening for siblings: Brothers and sisters may need eye exams sooner than usual, sometimes starting at birth.

• Future family planning: A parent who carries a heritable RB1 change has roughly a 1 in 2 chance of passing it to each child.

• Long-term cancer surveillance: Heritable retinoblastoma can raise the risk of other cancers later in life, so adult survivors often stay in oncology follow-up.

For a primer on inherited cancer gene testing, see what is BRCA gene testing and when should you get it. RB1 and BRCA are separate genes, but the planning ideas overlap.

How Treatment Planning Usually Works

Once retinoblastoma is confirmed, the first goal is the child's life. After that, the team looks at whether the eye can be saved and whether useful vision can be preserved.

Treatment is individualized. Decisions depend on tumor size, location, whether one or both eyes are involved, and whether disease has spread. A pediatric specialty center, often a children's hospital with an ocular oncology team, leads this care.

Specialists may discuss:

• Focal treatment: Laser or freezing may be used for selected smaller tumors inside the eye.

• Chemotherapy: Medicine may be given through a vein, into an artery near the eye, or directly into the eye.

• Radiation therapy: Radiation is used selectively, and specialists often limit exposure in heritable retinoblastoma.

• Eye removal: Called enucleation, this may be the safest first step when the eye cannot be saved or the tumor is large.

• Long-term follow-up: Children may need repeated eye exams under anesthesia and, in heritable cases, monitoring for new tumors.

Surgery for retinoblastoma is performed by pediatric ocular oncology teams. Many families also find a primer on chemotherapy useful as background. 

What Outlook Looks Like

Many children in the United States do well when retinoblastoma is found while still inside the eye. Outcomes are harder to predict if disease has spread.

A few honest points often help families:

• Each child is different: Outlook depends on tumor size, location, spread, treatment response, and whether disease is heritable.

• Treatment is not the endpoint: Frequent eye exams continue after active treatment, sometimes under anesthesia for years.

• Adult life often follows: Most survivors grow up and benefit from long-term oncology follow-up, especially after heritable retinoblastoma.

Heritable retinoblastoma survivors can carry an elevated risk for second cancers later in life, including non-small cell lung cancer, which is one reason surveillance becomes part of adult care. 

Where ACTC Fits for Adult Survivors

Children with a new retinoblastoma diagnosis need a children's specialty team, and pediatric ocular oncology care belongs there. Adult survivorship is a different conversation.

Long-term surveillance after childhood retinoblastoma usually stays with your primary care doctor, an ophthalmologist, and any survivorship clinic that has followed you over time. Our role is narrower. If a new cancer is found during routine surveillance, our team in Brooksville can take on the treatment side close to home.

What we can help with:

• Treatment for a new cancer diagnosis: If a second primary cancer is found, our medical oncology, radiation oncology, and hematology oncology services are available locally.

• Care close to home: Local imaging, labs, and infusion when treatment is part of the plan, so visits do not always mean a long drive.

• Financial counseling: Our financial counselors can help you understand coverage and out-of-pocket costs.