Test on Temporal Bone and Skull Fractures

Question 1: An otic capsule violating temporal bone fracture is typically a longitudinal fracture that spares the otic capsule.

A. Ano

B. Ne

Explanation: The study materials describe an otic capsule violating temporal bone fracture as a comminuted transverse fracture that violates the otic capsules. Longitudinal fractures, which represent 70% to 90% of temporal bone fractures, spare the otic capsule.

Question 2: Which of the following CT findings should raise the suspicion of a temporal bone fracture?

A. Opacification of the mastoid air cells

B. Fluid in the middle ear cavity

C. Pneumocephalus

D. Dilated ventricles

Explanation: According to the study materials, findings such as opacification of the mastoid air cells, fluid in the middle ear cavity, and pneumocephalus should raise the suspicion of a temporal bone fracture. Dilated ventricles are not listed as a sign of a temporal bone fracture.

Question 3: A longitudinal right temporal bone fracture can be detected on noncontrast CT.

A. Ano

B. Ne

Explanation: Longitudinal right temporal bone fractures are detected on noncontrast CT as shown in the study materials.

Question 4: Transverse temporal bone fractures commonly result in sensorineural hearing loss, but facial palsy is rarely observed as a complication.

A. Ano

B. Ne

Explanation: The study materials state that sensorineural hearing loss is a complication of transverse temporal bone fractures. However, it also clearly states that "Facial palsy is seen in 30% to 50% of these cases and is often complete," which contradicts the idea that facial palsy is rarely observed.

Question 5: According to the provided study materials, which of the following outcomes are more likely to occur with otic capsule-violating fractures compared to otic capsule-sparing fractures?

A. Increased likelihood of facial nerve injury

B. Increased likelihood of perilymphatic fistula

C. Increased likelihood of CSF leak

D. Increased likelihood of intracranial injuries like epidural hematoma

Explanation: The study materials state that patients with otic capsule-violating fractures are '2 to 5 times more likely to develop facial nerve injury, 4 to 8 times more likely to develop CSF leak, and more likely to sustain intracranial injuries such as epidural hematoma and subarachnoid hemorrhage.' Perilymphatic fistula is mentioned as a complication of transverse temporal bone fractures, but not specifically tied to otic capsule-violating fractures in comparison to otic-sparing ones.