Computerized tomographic scan findings in facial fractures associated with blindness.

A retrospective study of 379 consecutive patients who underwent operative repair of facial fractures at the West Virginia University Medical Center was carried out. Blindness developed in at least one eye in 21 (6%) of the 379 patients studied. Le Fort II and Le Fort III fractures, frontal bone and frontal sinus fractures, severe fractures of the zygoma, and fractures of the orbital floor were associated with fractures of the lesser sphenoid wing and optic canal in 5 of the patients studied. These 5 patients had indirect optic nerve injuries, as determined by CT scan and clinical criteria, which included visual loss with afferent pupillary defect and an otherwise normal ophthalmologic examination. In addition, one other patient who was not one of the 379 patients who underwent operative repair gradually developed ipsilateral blindness as a result of indirect optic nerve injury following minimal frontal bone trauma without a fracture. The usual mechanism of injury was trauma at the level of the orbital roof. The principal findings on CT scan were those of fracture of the lesser sphenoid wing and subdural hematoma of the optic nerve sheath. The association between sphenoethmoid sinus hemorrhage and fracture of the optic canal (31%) in cases of facial trauma has been presented. The indications for optic nerve decompression have been discussed. To the authors' knowledge, there is no previous report of an optic canal fracture as diagnosed by computerized tomography in the literature.