Patients with orbital issues of diplopia, eye proptosis, and visual loss will require ophthalmologic treatment. In the maxilla it can cause proptosis, epistaxis and nasal airway obstruction. Primary visible signs of ocular lymphoma include proptosis and a visible mass in the eye. Affected individuals typically present with sudden painful proptosis, redness, and edema. Often, craniofacial osteoma presents itself through ocular signs and symptoms (such as proptosis). Orbital tumors often present with orbital swelling and proptosis. Proptosis is the anterior displacement of the eye from the orbit. Proptosis will vary according to the degree of inflammation, fibrosis, and mass effect. The most common sign is proptosis, but redness and pain are also experienced. En plaque meningiomas characteristically lead to slowly increasing proptosis with the eye angled downward. In cats, eye proptosis is uncommon and is often accompanied by facial fractures. Spread of the tumor into the orbit causes proptosis. Proptosis is the main cause of morbidity in TED. The term exophthalmos is often used when describing proptosis associated with Graves' disease.