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Chapter 34. Endoscopic Skull Base Surgery
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An Onodi cell may contain the optic nerve and is defined as a posterior ethmoid cell that
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A. Creates a horizontal sphenoid sinus septation above the posterior bony choana
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B. Creates a vertical sphenoid sinus septation above the posterior bony choana
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C. Obstructs the sphenoid sinus
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D. Pneumatizes into the posterior bony choana
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The lateral boundary of the pterygopalatine fossa is
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A. Greater palatine canal
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B. Inferior orbital fissure
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C. Pterygomaxillary fissure
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D. Both the inferior orbital fissure superiorly and the pterygomaxillary fissure inferiorly
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Which of the following is not a reliable sign of periorbital involvement by a sinonasal tumor?
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A. Enhancement or enlargement of extraocular muscles
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B. Stranding of periorbital fat
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C. Displacement of the mass into the orbit with demineralization of the lamina papyracea
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D. Nodularity of plane between the orbital tissue and the mass
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When considering benign intracranial hypertension
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A. Normal intracranial opening pressure is between 10 and 15 cm H2O; however, elevated pressures are typically around 25 to 27 cm H2O
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B. A common site for spontaneous leaks and encephaloceles associated with elevated ICP is the lateral sphenoid recess
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C. BIH usually occurs in obese women and presents with headache, pulsatile tinnitus, balance problems, and visual changes
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Nasoseptal flaps have reduced the incidence of postoperative CSF leak. Which of the following statement is correct?
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A. They receive contributions of blood supply from the vidian artery.
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B. They are a free mucosal graft harvested from the nasal septum.
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C. The vascular pedicle runs along the roof of the nasopharynx.
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D. They are supplied by the posterior septal branch of the sphenopalatine artery.