Congenital intraorbital arteriovenous aneurysm.
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There are many causes of abnormal protrusion of one or both eyes, the most common of which is imbalance of the glands of internal secretion. Among other causes are a variety of tumors that originate behind the eye or that extend to that location from other parts in the body. Infections can extend to the orbit behind the eye from the neighboring structures such as the paranasal sinuses. Infection may also extend to the orbit from distant areas by way of the blood and cause exophthalmos.
Exophthalmos may be due to an inflammatory process or to tumor formation. Inflammatory processes are most likely to occur in children and young adults. Tumors are the most common cause of exophthalmos in adults.Since the advent of chemotherapy and the antibiotics, rarely does orbital cellulitis develop from sinal infection. Tumors causing exophthalmos are likely to be benign if they arise from the frontal sinus and malignant if they arise from the maxillary and ethmoid sinuses.
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