Inferior Orbital Floor Fracture Radiology

A portion of the inferior rectus muscle solid red arrow projects into the maxillary sinus below see normal opposite side broken red arrow.

Inferior orbital floor fracture radiology.

Blowout fractures can occur through one or more of the orbital walls. Inferior floor medial wall lamina papyracea superior roof lateral wall. Left orbital floor fracture is depressed by 3 5 millimeters. Orbital fractures are common occurring in 10 25 of all cases of facial fracture 1 common mechanisms include blunt trauma mainly from assault and motor vehicle accident.

No evidence of rectus muscle entrapment retrobulbar hemorrhage or proptosis. Computed tomography scan demonstrating a fracture of the orbital floor involving both inferior and medial walls resulting in a depressed fragment. The inferior orbital wall is most commonly affected by fracture 2 signs of orbital fracture typically include peri ortbital bruising and subconjunctival hemorrhage. Fractures of the medial and lateral orbital walls.

A blowout fracture of the orbital floor is defined as a fracture of the orbital floor in which the inferior orbital rim is intact. Approximately 50 will be associated with medial orbital wall fracture. The inferior orbital fissure iof lies in the floor of the orbit inferior to the superior orbital fissure and it is bounded superiorly by the greater wing of sphenoid inferiorly by maxilla and orbital process of palatine bone and laterally by the zygomatic bone it opens into posterolateral aspect of orbital floor. Left orbital floor fracture.

It joins medially with the pterygomaxillary fissure at a right angle. Hemorrhage partially fills the left maxillary sinus. The infraorbital canal is a site of weakness. Inferior blowout fractures are the most common.

Orbital fat prolapses into the maxillary sinus and may be joined by prolapse of the inferior rectus muscle. These type of fractures usually result from a direct blow to the orbit. This computed tomography image shows encroachment on lateral rectus muscle secondary to the lateral wall fracture. Bilateral frontal intraparenchymal hemorrhages.

It is estimated that about 10 of all facial fractures are isolated orbital wall fractures the majority of these being the orbital floor and that 30 40 of.