Chapter 34: Endoscopic Skull Base Surgery

Chapter 34. Endoscopic Skull Base Surgery

An Onodi cell may contain the optic nerve and is defined as a posterior ethmoid cell that

A. Creates a horizontal sphenoid sinus septation above the posterior bony choana

B. Creates a vertical sphenoid sinus septation above the posterior bony choana

C. Obstructs the sphenoid sinus

D. Pneumatizes into the posterior bony choana

The lateral boundary of the pterygopalatine fossa is

A. Greater palatine canal

B. Inferior orbital fissure

C. Pterygomaxillary fissure

D. Both the inferior orbital fissure superiorly and the pterygomaxillary fissure inferiorly

Which of the following is not a reliable sign of periorbital involvement by a sinonasal tumor?

A. Enhancement or enlargement of extraocular muscles

B. Stranding of periorbital fat

C. Displacement of the mass into the orbit with demineralization of the lamina papyracea

D. Nodularity of plane between the orbital tissue and the mass

When considering benign intracranial hypertension

A. Normal intracranial opening pressure is between 10 and 15 cm H₂O; however, elevated pressures are typically around 25 to 27 cm H₂O

B. A common site for spontaneous leaks and encephaloceles associated with elevated ICP is the lateral sphenoid recess

C. BIH usually occurs in obese women and presents with headache, pulsatile tinnitus, balance problems, and visual changes

D. All of the above

Nasoseptal flaps have reduced the incidence of postoperative CSF leak. Which of the following statement is correct?

A. They receive contributions of blood supply from the vidian artery.

B. They are a free mucosal graft harvested from the nasal septum.

C. The vascular pedicle runs along the roof of the nasopharynx.

D. They are supplied by the posterior septal branch of the sphenopalatine artery.