Vascular lesions in the orbit.

Vascular lesions in the postbulbar region of the orbit include hemangiomas, lymphangiomas, dural arteriovenous fistulae, aneurysms, varices, and hematic cysts. The heterogeneous nature of the group indicates the diverse origins of the different entities. Cross-sectional imaging, including computed tomography and magnetic resonance imaging, is used for the majority of these lesions, although special computed tomography and magnetic resonance techniques and selective arteriography occasionally are needed for specific indications.