The orbit is a cavity in the skull that houses the eyeball, eye muscles, nerves, blood vessels, and connective tissues, encased by a delicate bone structure. Tumors can form anywhere within the orbit, including behind the eyeball. Due to the confined space around the eye, even a small lesion can significantly impact it. Orbital masses may indicate abnormal tissue growth, inflammation, or infection; however, most are benign.

Malignant orbital tumors are less common than benign ones. Among malignant types, lymphoma is prevalent, while lacrimal gland cancer occurs less frequently. Orbital lymphoma is the most common malignant tumor in adults. In children, rhabdomyosarcoma is the most common malignant orbital tumor.

The causes of tumors behind the eye vary by type. Common benign orbital tumors include dermoid cysts and cavernous hemangiomas. Dermoid cysts are congenital lesions, forming during the fetal stage due to incomplete tissue development, and typically enlarge over time. The cause of cavernous hemangiomas remains unclear; they are common in adults, affecting women more than men, and can occasionally be associated with rare vascular malformation syndromes.

The causes of malignant eye tumors are not yet clearly defined. Experts suggest that changes in cellular DNA can lead to uncontrolled cell growth and, subsequently, cancer. While some DNA alterations may stem from genetic factors, most are acquired during a person's lifetime.

Symptoms of a tumor behind the eye depend on its type, size, and location. Benign orbital tumors can cause: bulging eyes, changes in pupil size or shape, restricted or paralyzed eye movement, swelling of tissues around the eye, corneal damage, reduced or altered vision, double vision, eye irritation, and a pulsating sensation within the eye. This condition can sometimes lead to pain, which typically increases as the tumor grows. In rare instances, a benign tumor may rupture, causing hemorrhage and sudden pain.

Symptoms of malignant eye tumors can be similar to benign ones, varying by location and size. Patients may experience: reduced or lost vision, pain around the eye or temple, decreased sensation in the periorbital area, proptosis (bulging eyeball), and restricted or altered eye movement. These symptoms are sometimes accompanied by floaters or flashes of light.

Some benign tumors, such as cavernous hemangiomas, may only require monitoring if they are asymptomatic. Dermoid cysts are often surgically removed, particularly when the tumor tends to enlarge. For malignant tumors, treatment depends on the type and stage of the disease, and may include close monitoring, radiation therapy to shrink the tumor, or surgical removal.

*Bao Bao (According to Healthline)*