Inferior Orbital Floor Fracture Radiology

No evidence of rectus muscle entrapment retrobulbar hemorrhage or proptosis. The infraorbital canal is a site of weakness. 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.

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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.

Inferior orbital floor fracture radiology.

Inferior floor medial wall lamina papyracea superior roof lateral wall. Hemorrhage partially fills the left maxillary sinus. Inferior blowout fractures are the most common. The inferior orbital wall is most commonly affected by fracture 2 signs of orbital fracture typically include peri ortbital bruising and subconjunctival hemorrhage.

It joins medially with the pterygomaxillary fissure at a right angle. 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. Bilateral frontal intraparenchymal hemorrhages.

Fractures of the orbital floor are common. 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. Fractures of the medial and lateral orbital walls. Left orbital floor fracture is depressed by 3 5 millimeters.

This computed tomography image shows encroachment on lateral rectus muscle secondary to the lateral wall fracture. Reformatted coronal ct of the facial bones demonstrates a fracture of the floor of the left orbit white arrow associated with orbital emphysema blue arrow. A portion of the inferior rectus muscle solid red arrow projects into the maxillary sinus below see normal opposite side broken red arrow. Blowout fractures can occur through one or more of the orbital walls.

Left orbital floor fracture. Computed tomography scan demonstrating a fracture of the orbital floor involving both inferior and medial walls resulting in a depressed fragment. Blowout fracture of the orbit. 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.

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