Blowout Fracture
Orbital blowout fractures occur when there is a fracture of one of the walls of orbit but the orbital rim remains intact.

Orbital blowout fractures are usually the result of a direct blow to the orbit, which causes a sudden increase in intraorbital pressure. Decompression then occurs by fracture of one or more of the bounding walls of the orbit. Although the causative trauma is usually substantial, presentation and diagnosis may be delayed in the setting of extensive soft tissue swelling and an intact orbital rim.