Otologic and Neurotologic Emergencies Practice Questions

Q: What is the typical mode of trauma associated with a longitudinal petrous bone fracture?

Longitudinal. **Explanation:** Temporal bone fractures are traditionally classified based on their relationship to the long axis of the petrous pyramid. **1. Why Longitudinal is Correct:** Longitudinal fractures are the most common type (approx. 80%) and typically result from **lateral (temporal/parietal) blunt trauma**. The fracture line runs parallel to the long axis of the petrous bone. Because the fracture usually bypasses the bony labyrinth, the **ossicular chain** is more frequently disrupted (conductive hearing loss) than the inner ear structures. **2. Why Other Options are Incorrect:** * **Transverse:** These occur due to **frontal or occipital trauma**. The fracture line runs perpendicular to the petrous pyramid. While less common (20%), they are more severe as they often involve the otic capsule, leading to permanent sensorineural hearing loss and vertigo. * **Mixed:** These involve components of both patterns and usually occur in high-energy multi-directional trauma. * **Any complete fracture:** This is a non-specific clinical descriptor and does not define the anatomical orientation or mechanism of injury. **Clinical Pearls for NEET-PG:** * **Hearing Loss:** Longitudinal = Conductive (Ossicular disruption/Tympanic membrane tear); Transverse = Sensorineural (Otic capsule involvement). * **Facial Nerve Palsy:** More common in **Transverse** fractures (50%) compared to Longitudinal (20%). * **Signs:** Longitudinal fractures are associated with **Bleeding from the ear** and "Step-off" deformity of the external auditory canal. Transverse fractures often present with **Hemotympanum** (intact drum). * **Battle Sign:** Post-auricular ecchymosis indicating a mastoid/basilar skull fracture.

Q: All of the following are true about transverse fractures of the temporal bone EXCEPT:

Conductive deafness can occur. Temporal bone fractures are traditionally classified into **Longitudinal** and **Transverse** based on their relationship to the long axis of the petrous pyramid. ### Why Option C is the Correct Answer (The "EXCEPT") Transverse fractures run perpendicular to the petrous ridge, typically crossing the internal auditory canal or the bony labyrinth (cochlea/vestibule). Because the fracture line directly destroys the inner ear structures or the vestibulocochlear nerve, it results in **Sensorineural Hearing Loss (SNHL)**. Conductive hearing loss is characteristic of *longitudinal* fractures, where the tympanic membrane or ossicular chain is disrupted, but the inner ear is spared. ### Analysis of Incorrect Options * **A. Facial nerve is commonly involved:** True. The facial nerve is injured in approximately **50%** of transverse fractures (compared to only 20% in longitudinal). The injury is often a complete transection. * **B. Sensorineural deafness can occur:** True. As the fracture line traverses the otic capsule, it causes permanent, often profound, SNHL and severe vertigo/nystagmus. * **D. These fractures are less common:** True. Transverse fractures account for only **20%** of temporal bone fractures, usually resulting from severe frontal or occipital blows. Longitudinal fractures are more common (80%). ### High-Yield Clinical Pearls for NEET-PG | Feature | Longitudinal Fracture (80%) | Transverse Fracture (20%) | | :--- | :--- | :--- | | **Mechanism** | Lateral blow (Temporal) | Frontal/Occipital blow | | **Hearing Loss** | **Conductive** (Common) | **Sensorineural** (Common) | | **Facial Nerve** | 20% (Delayed/Neuropraxia) | **50%** (Immediate/Transection) | | **Bleeding** | Bleeding from Ear (Tear in TM) | **Hemotympanum** (Intact TM) | | **CSF Leak** | CSF Otorrhea | CSF Rhinorrhea (via Eustachian tube) |

Q: Unilateral conductive deafness after head injury is due to all EXCEPT:

Secretory otitis media. ### Explanation The core concept behind this question is identifying the causes of **traumatic conductive hearing loss (CHL)** versus inflammatory/non-traumatic middle ear pathologies. **Why Secretory Otitis Media (SOM) is the correct answer:** Secretory Otitis Media (also known as Otitis Media with Effusion) is characterized by the accumulation of non-purulent fluid in the middle ear, typically due to **Eustachian tube dysfunction** or following an upper respiratory tract infection. It is a chronic or subacute inflammatory condition, not a direct sequela of acute head trauma. While trauma can cause bleeding (hemotympanum), it does not acutely cause the sterile, serous effusion seen in SOM. **Analysis of Incorrect Options (Causes of Traumatic CHL):** * **Dislocation of Incudostapedial (IS) Joint:** This is the **most common** ossicular chain disruption following head injury. The incus is the most vulnerable ossicle because it is suspended between the firmly attached malleus and the fixed stapes. * **Perforation of Tympanic Membrane:** Direct trauma (e.g., a slap or a foreign body) or indirect barotrauma from a head injury can rupture the membrane, leading to immediate CHL. * **Hemotympanum:** This refers to the presence of blood in the middle ear cavity, often seen in longitudinal fractures of the temporal bone. The blood acts as a physical barrier to sound conduction, causing temporary CHL. **NEET-PG High-Yield Pearls:** 1. **Most common ossicular lesion in trauma:** Incudostapedial joint dislocation. 2. **Most common ossicle to be fractured:** Incus (specifically the long process). 3. **Temporal Bone Fractures:** * **Longitudinal (80%):** More common; usually results in **Conductive Hearing Loss**. * **Transverse (20%):** Less common; usually results in **Sensorineural Hearing Loss** and Facial Nerve Palsy. 4. **Battle’s Sign:** Post-auricular ecchymosis indicating a fracture of the petrous temporal bone.

Question 1

Which of the following associations is true regarding facial nerve palsy in temporal bone fractures?

Accepted Answer

Common with transverse fractures

Answer

Common with longitudinal fractures

Answer

Always associated with CSF otorrhea

Answer

Facial nerve injury is always complete

Question 2

What is the typical mode of trauma associated with a longitudinal petrous bone fracture?

Accepted Answer

Longitudinal

Answer

Transverse

Answer

Mixed

Answer

Any complete fracture

Question 3

All of the following are true about transverse fractures of the temporal bone EXCEPT:

Accepted Answer

Conductive deafness can occur

Answer

Facial nerve is commonly involved

Answer

Sensorineural deafness can occur

Answer

These fractures are less common

Question 4

Unilateral conductive deafness after head injury is due to all EXCEPT:

Accepted Answer

Secretory otitis media

Answer

Dislocation of incudostapedial joint

Answer

Perforation of tympanic membrane

Answer

Hemotympanum

Question 5

What is the treatment of cholesteatoma with facial paresis in a child?

Accepted Answer

Immediate mastoidectomy

Answer

Antibiotics to dry the ear followed by mastoidectomy

Answer

Observation

Answer

Antibiotic ear drops only

Otologic and Neurotologic Emergencies — MCQs

Otologic and Neurotologic Emergencies — MCQs

On this page

Practice by Chapter

Want unlimited practice?