ConditionEyes & vision
Orbital Inflammatory Disease (Orbital Pseudotumor)
Orbital inflammatory disease is inflammation of the tissues inside the eye socket (orbit): fat, muscles, tear gland or connective tissue. The best-known form, idiopathic orbital inflammation or orbital pseudotumor, has no identifiable cause. It typically causes sudden eye pain, eyelid swelling, redness, a bulging eye and double vision on one side. It mimics infection and tumors, so it needs prompt imaging. Most cases respond quickly to corticosteroids, though some recur.
Also called: Orbital inflammatory syndrome, idiopathic orbital inflammation, orbital pseudotumor, nonspecific orbital inflammation, orbital myositis (when muscles affected)
At a glance
- What it is
- Inflammation of tissues within the eye socket.
- Forms
- Idiopathic (pseudotumor), or secondary to diseases like IgG4-RD, sarcoidosis, GPA, thyroid eye disease.
- Symptoms
- Sudden orbital pain, eyelid swelling, red eye, bulging, double vision, pain moving the eye.
- Key differences
- No fever or sinus infection (unlike orbital cellulitis).
- Diagnosis
- CT or MRI, blood tests; biopsy for atypical or recurrent cases.
- Treatment
- Oral corticosteroids; immune-suppressing medicines or radiation for recurrent disease.
When to get help
Call 911 or go to the ER
- Painful swollen eyelids with fever, sinus symptoms or feeling unwell (rule out orbital cellulitis)
- Reduced vision, loss of color vision or a dark pupil reaction in the affected eye
- Inability to move the eye with severe pain and swelling
See a doctor within a day or two
- Sudden eye pain with eyelid swelling, a bulging eye or double vision, without fever (see a doctor within 24 hours)
- Pain on moving the eye with a red eye
Book a routine appointment
- Painless, gradual swelling of the upper outer eyelid lasting weeks (possible tear gland inflammation or tumor)
- Recurrent episodes after previous treatment
What orbital inflammatory disease is
The orbit contains the eyeball, the six muscles that move it, the optic nerve, the tear gland, fat and blood vessels. In orbital inflammatory disease, immune cells infiltrate one or more of these. When no cause is found, it is called idiopathic orbital inflammation (or pseudotumor, because it can look like a tumor on scans). It is the third most common orbital disorder after thyroid eye disease and lymphoproliferative disease. It usually affects adults but can occur in children.
Types by location
| Type | Area involved | Typical signs |
|---|---|---|
| Dacryoadenitis | Tear gland | Upper outer eyelid swelling and tenderness, S-shaped lid |
| Myositis | Eye muscles | Pain and double vision on moving the eye |
| Anterior orbital | Front of the orbit, near the eyeball | Pain, redness, swelling, sometimes uveitis |
| Diffuse | Whole orbit | Bulging, limited movement, possible vision loss |
| Apical | Back of the orbit | Vision loss with less swelling |
| Sclerosing | Fibrotic form | Gradual, more resistant to treatment |
Symptoms
- sudden, often severe pain in or around the eye
- swelling and redness of the eyelids
- bulging of the eye (proptosis)
- double vision or limited eye movement
- pain when moving the eye
- red eye
- reduced vision if the optic nerve is compressed
- usually one eye; both eyes in a minority, especially in children
Causes and associated diseases
Idiopathic cases have no identifiable cause. Secondary orbital inflammation occurs with:
- IgG4-related disease
- granulomatosis with polyangiitis and other forms of vasculitis
- sarcoidosis
- lupus, rheumatoid arthritis, Crohn's disease
- thyroid eye disease, which is the most common cause of orbital inflammation overall but is usually considered separately
Conditions to exclude
| Condition | Clues |
|---|---|
| Orbital cellulitis | Fever, sinusitis, rising white count; needs IV antibiotics |
| Thyroid eye disease | Eyelid retraction, both eyes, thyroid antibodies |
| Lymphoma | Painless, gradual swelling, often older adults |
| Metastatic cancer and other tumors | Progressive, may have cancer history |
| Vascular lesions | Pulsation, change with position |
Diagnosis
- Eye examination: vision, color vision, pupil reactions, eye movements, eye pressure and measurement of bulging.
- CT or MRI of the orbits with contrast: shows which structures are inflamed and excludes abscess, sinus disease and tumors.
- Blood tests: thyroid function and antibodies, IgG4, ANCA, ACE, ANA, inflammatory markers, blood count.
- Biopsy: recommended for atypical features, poor response to steroids, recurrence or suspected tumor, especially of the tear gland.
Treatment
- Oral corticosteroids: high-dose prednisone typically brings dramatic improvement in pain within 24 to 48 hours. A rapid response supports the diagnosis. Steroids are tapered slowly over weeks to months to reduce relapse.
- Steroid-sparing medicines: methotrexate, mycophenolate, azathioprine, or biologics such as rituximab or TNF inhibitors for recurrent or steroid-dependent disease.
- Low-dose radiation therapy for resistant cases.
- Surgery: biopsy or debulking in selected cases.
- Treat the underlying disease for secondary forms.
Steroids have side effects including high blood sugar, mood changes, sleep problems and bone loss, which are monitored.
Outlook
Most people respond well, with symptoms resolving over weeks. Recurrence occurs in a significant minority, sometimes in the other eye. Sclerosing and apical forms are harder to treat and carry a higher risk of permanent vision loss or restricted eye movement.
Frequently asked questions
What is orbital inflammatory disease?
It is inflammation of the tissues in the eye socket, including muscles, fat and the tear gland. When no cause is found, it is called idiopathic orbital inflammation or orbital pseudotumor. It causes pain, swelling, a bulging eye and double vision.
What causes orbital pseudotumor?
By definition, orbital pseudotumor has no identifiable cause and is thought to be an immune reaction. Similar inflammation can be caused by IgG4-related disease, sarcoidosis, vasculitis and other autoimmune conditions, which doctors check for with blood tests and sometimes biopsy.
How is orbital inflammatory disease different from orbital cellulitis?
Orbital cellulitis is a bacterial infection, usually spreading from the sinuses, with fever and needing antibiotics. Orbital inflammatory disease is non-infectious, usually without fever, and treated with steroids. Imaging and blood tests help tell them apart.
How is orbital pseudotumor treated?
Oral corticosteroids are the main treatment and usually relieve pain within a day or two. The dose is tapered slowly. Recurrent cases may need other immune-suppressing medicines or low-dose radiation therapy.
Can orbital inflammation cause blindness?
It can if inflammation compresses the optic nerve, especially in the apical or sclerosing forms, or if treatment is delayed. Most people recover full vision with prompt treatment. Any reduction in vision or color vision needs urgent assessment.
Sources
This guide was written from current patient and clinical guidance, including:
- American Academy of Ophthalmology: EyeWiki, idiopathic orbital inflammation
- National Organization for Rare Disorders (NORD): Orbital pseudotumor
- Merck Manual Professional: Orbital inflammatory disease
- American Society of Ophthalmic Plastic and Reconstructive Surgery: Orbital disorders
- StatPearls (NCBI Bookshelf): Orbital pseudotumor