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Saturday, January 28, 2017

Basilar Skull Fracture

Introduction: The skull “base” comprises the frontal bone, occiput, occipital condyles, clivus, carotid canals, petrous portion of the temporal bones, and the posterior sphenoid wall. A basilar skull fracture is basically a linear fracture of the skull base.

Clinical Features: Trauma resulting in fractures to this area typically does not have localizing symptoms.
Indirect signs of the injury may include visible evidence of bleeding from the fracture into surrounding soft tissue, such as a Battle sign or “raccoon eyes.” (see picture shown below)

Battle Sign. A striking Battle sign is seen in this patient with head trauma. This finding may take hours to days to develop.


Bleeding into other structures—including hemotympanum or blood in the sphenoid sinus seen as an air-fluid level on computed tomography (CT)—may also be seen. Cerebrospinal fluid (CSF) leaks may also be evident and noted as clear or pink rhinorrhea. If CSF is present, a dextrose stick test may be positive. The fluid can be placed on filter paper and a “halo” or double ring may be seen.


Raccoon Eyes. Acute periorbital ecchymosis seen in this patient with a basilar skull fracture. These findings may also be caused by facial fractures.

Management 
1. Identify underlying brain injury, which is best accomplished by CT. CT is also the best diagnostic tool for identifying the fracture site, but fractures may not always be evident.
2, Evidence of open communication, such as a CSF leak, mandates neurosurgical consultation and admission. Otherwise, the decision for admission is based on the patient’s clinical condition,
other associated injuries, and evidence of underlying brain injury as seen on CT.
3. The use of antibiotics in the presence of a CSF leak is controversial because of the possibility of
selecting resistant organisms.

Important Points To Remember: 

  • Clinical manifestations of basilar skull fracture may take several hours to fully develop.
  • There should be a low threshold for head CT in any patient with head trauma, loss of consciousness, change in mental status, severe headache, visual changes, or nausea or vomiting.
  • The use of filter paper or a dextrose stick test to determine if CSF is present in rhinorrhea is not 100% reliable.

1 comment:


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