Orbital Tumors
Growths within the bony eye socket
Quick Facts
- Type: Tumor of the eye socket
- Location: Orbit (around and behind the eye)
- Behavior: Benign or malignant
- Key sign: A bulging or displaced eye
Overview
The orbit is the bony socket in the skull that holds and protects the eye, along with the muscles, nerves, blood vessels, fat, and tear gland that surround it. An orbital tumor is a growth that develops within this space. Because the orbit is a confined area, even a small growth can push on the eye and nearby structures, causing the eye to bulge forward or shift position.
Orbital tumors can be noncancerous (benign) or cancerous (malignant). They may start in the orbit itself, spread from a nearby area such as the sinuses or eyelid, or, less often, travel from cancer elsewhere in the body. They occur in both children and adults, with different types being more common at different ages. Prompt evaluation is important because the right treatment depends on identifying the specific type.
Symptoms
Symptoms come from the tumor taking up space and pressing on the eye and surrounding tissues.
- A bulging eye (proptosis), the most common sign
- The eye pushed to one side or out of its usual position
- Double vision or trouble moving the eye
- Blurred vision or loss of vision
- Swelling or a visible lump around the eye
- Pain, pressure, or a feeling of fullness behind the eye
- Swollen eyelids or redness
Symptoms may come on slowly with benign growths or more quickly with aggressive or inflammatory ones.
Causes
Orbital tumors arise from the different tissues that make up the orbit, and their cause often is not known. They can be grouped by origin:
- Primary tumors: Start in the orbit's own tissues, such as blood vessels, nerves, muscle, fat, or the tear gland; many are benign.
- Tumors spreading from nearby areas: Such as the sinuses, eyelids, or brain.
- Tumors that spread from elsewhere (metastases): Cancer from another part of the body that reaches the orbit.
Some orbital masses are not true tumors but inflammatory or vascular conditions that mimic them, which is why careful evaluation is essential.
Risk Factors
- Age, with different tumor types more common in children versus adults
- A history of cancer elsewhere in the body, which can spread to the orbit
- Certain inherited conditions associated with specific tumors
- Nearby sinus or eyelid cancers that can extend into the orbit
Most orbital tumors occur without a clear preventable cause.
Diagnosis
Diagnosis relies heavily on imaging and often a tissue sample:
- Eye examination: Checks vision, eye movement, eye position, and how far the eye protrudes.
- Imaging: CT and MRI scans are key to showing the location, size, and characteristics of the tumor.
- Biopsy: A tissue sample identifies the exact type and whether it is benign or malignant.
- Additional tests: Blood tests or whole-body imaging when a tumor that has spread is suspected.
Treatment
Treatment is tailored to the type of tumor, whether it is benign or malignant, and its location within the orbit.
- Observation: Some small, benign, slow-growing tumors are monitored if they are not causing problems.
- Surgery: Removal of the tumor is common, performed by specialists experienced in orbital surgery to protect the eye and surrounding structures.
- Radiation therapy: Used for certain tumors, alone or after surgery.
- Chemotherapy or targeted/medical therapy: For some cancers and for tumors that have spread.
- Treating mimics: Inflammatory orbital conditions are treated with medication rather than tumor surgery.
Care is often coordinated among eye specialists, cancer specialists, and others, with follow-up to monitor vision and for any recurrence.
Prevention
Most orbital tumors cannot be prevented, because their causes are largely unknown. The most useful step is early evaluation of warning signs, particularly a bulging or displaced eye, double vision, or unexplained vision changes. For people with a known cancer elsewhere in the body, reporting new eye symptoms promptly helps catch any spread to the orbit early, when treatment is most effective.
When to See a Doctor
See an eye doctor promptly if you notice a bulging eye, an eye that has shifted position, double vision, or a lump around the eye. Seek urgent care for sudden or worsening vision loss, severe eye pain, a rapidly swelling or protruding eye, or these symptoms following an injury, as they can signal pressure on the eye or optic nerve that needs immediate attention to protect sight.
Frequently Asked Questions
What is the most common sign of an orbital tumor?
The most common sign is a bulging eye, where the eye is pushed forward or out of its normal position. Other signs include double vision, trouble moving the eye, vision changes, and swelling or a lump around the eye.
Are orbital tumors cancerous?
They can be either benign or cancerous. Some start in the orbit's own tissues and are noncancerous, while others are cancers that begin there, spread from a nearby area such as the sinuses, or travel from cancer elsewhere in the body. A biopsy determines the type.
How are orbital tumors diagnosed?
Diagnosis relies on a detailed eye examination and imaging with CT or MRI scans to show the tumor's size and location. A biopsy is often needed to identify the exact type and whether it is benign or malignant, which guides treatment.
How are orbital tumors treated?
Treatment depends on the type and may include careful observation for small benign tumors, surgery to remove the growth, radiation, or chemotherapy and targeted therapy for certain cancers. Care is usually coordinated among several specialists with regular follow-up.
References
- American Academy of Ophthalmology. Orbital Tumors.
- National Cancer Institute (NCI). Eye Cancer.
- MedlinePlus, U.S. National Library of Medicine. Eye and orbit tumors.
- Mayo Clinic. Eye cancer.