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.

Q: What is the best investigation for temporal bone injuries?

CT scan. **Explanation:** The **High-Resolution Computed Tomography (HRCT)** of the temporal bone is the **gold standard** and best investigation for temporal bone injuries. **1. Why CT scan is the correct answer:** The temporal bone has a highly complex internal architecture consisting of dense cortical bone and delicate air-filled spaces. CT scanning provides superior spatial resolution for visualizing bony details, such as fracture lines (longitudinal vs. transverse), ossicular chain disruption, and involvement of the otic capsule or facial nerve canal. It is fast, readily available in trauma settings, and can simultaneously evaluate for intracranial hemorrhages. **2. Why other options are incorrect:** * **Angiography:** This is indicated only if there is a suspected vascular injury (e.g., injury to the internal carotid artery or sigmoid sinus), but it is not the primary investigation for the bone itself. * **Plain film radiography:** Views like Schuller’s or Stenver’s are obsolete in modern trauma management as they lack the resolution to identify fine fracture lines or middle ear structures. * **MRI:** While excellent for soft tissues, MRI is poor at visualizing cortical bone. It is reserved for evaluating late complications like CSF leaks, facial nerve edema, or membranous labyrinthine pathology. **Clinical Pearls for NEET-PG:** * **Longitudinal Fractures (80%):** Most common; usually caused by lateral blows; often associated with conductive hearing loss and ossicular dislocation (Incudostapedial joint). * **Transverse Fractures (20%):** Caused by frontal/occipital blows; higher risk of **facial nerve palsy** (50%) and sensorineural hearing loss due to otic capsule involvement. * **Battle’s Sign:** Post-auricular ecchymosis indicating a posterior fossa/temporal bone fracture.

Q: A patient with chronic suppurative otitis media (CSOM) and cholesteatoma presents with acute onset of vertigo. What is the appropriate treatment?

Immediate exploration. **Explanation:** The clinical presentation of acute vertigo in a patient with **CSOM and Cholesteatoma** is a surgical emergency. It indicates that the disease has eroded the bony labyrinth, most commonly the **lateral semicircular canal**, leading to a **labyrinthine fistula** or acute labyrinthitis. **Why "Immediate Exploration" is correct:** In the presence of a cholesteatoma, vertigo signifies an impending or active intracranial or inner ear complication. The primary goal is the urgent surgical removal of the cholesteatoma (via Mastoidectomy) to decompress the area, remove the source of infection, and prevent further permanent damage to the vestibular and cochlear systems or spread to the intracranial compartment. **Why other options are incorrect:** * **B & C (Antibiotics/Steroids/Sedatives):** While medical management (antibiotics and labyrinthine sedatives) is used as an adjunct to stabilize the patient, it is **not definitive**. Relying solely on medication allows the underlying bone-eroding cholesteatoma to continue its destruction, risking total deafness (dead labyrinth) or meningitis. * **D (Labyrinthine sedatives only):** This merely masks the symptoms (vertigo) without addressing the life-threatening pathology. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of fistula:** Lateral (Horizontal) semicircular canal. * **Fistula Test:** A clinical test where pressure changes in the EAC (using a Siegle’s speculum) induce vertigo and nystagmus. It is positive in labyrinthine fistulae but may be **false negative** if the fistula is plugged by cholesteatoma or if the labyrinth is "dead." * **Management Rule:** Any complication of CSOM (vertigo, facial palsy, or intracranial spread) generally necessitates **urgent surgical intervention.**

Q: Griesinger's sign is seen in which of the following conditions?

Lateral sinus thrombosis. **Explanation:** **Griesinger’s sign** is a classic clinical indicator of **Lateral (Sigmoid) Sinus Thrombosis (LST)**, a serious extracranial complication of chronic suppurative otitis media (CSOM). 1. **Mechanism of the Correct Answer (A):** The sign refers to **edema and tenderness over the mastoid process** (specifically the posterior part). It occurs due to the thrombosis and retrograde extension of the clot into the **mastoid emissary vein**. Since this vein drains into the sigmoid sinus, its obstruction leads to localized venous congestion and edema in the overlying soft tissue of the mastoid. 2. **Analysis of Incorrect Options:** * **B. Meningitis:** Presents with neck rigidity, Kernig’s sign, and Brudzinski’s sign due to meningeal irritation, but does not involve emissary vein obstruction. * **C & D. Brain/Cerebellar Abscess:** These are space-occupying lesions. While they may coexist with LST, they typically present with signs of raised intracranial pressure (headache, vomiting, papilledema) and focal neurological deficits (e.g., dysmetria or ataxia in cerebellar abscess), rather than mastoid edema. **High-Yield Clinical Pearls for NEET-PG:** * **Tobey-Ayer Test (Queckenstedt's Test):** Used during lumbar puncture to diagnose LST. Compression of the internal jugular vein (IJV) on the diseased side fails to raise CSF pressure, while compression on the healthy side causes a rapid rise. * **Crowe-Beck Test:** Engorgement of retinal veins and conjunctiva upon manual compression of the IJV on the healthy side. * **Delta Sign:** Seen on contrast-enhanced CT (CECT), showing an empty triangular area (the clot) surrounded by enhanced dural walls of the sinus. * **Picket-fence Fever:** The characteristic hectic temperature spikes seen in LST due to periodic release of septic emboli into the bloodstream.

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

Question 6

What is a consequence of superior sagittal sinus thrombosis?

Accepted Answer

Otitic hydrocephalus

Answer

Petrositis

Answer

Meningitis

Answer

Cortical thrombophlebitis

Question 7

What is the best investigation for temporal bone injuries?

Accepted Answer

CT scan

Answer

Angiography

Answer

Plain film radiography

Answer

MRI

Question 8

A patient with chronic suppurative otitis media (CSOM) and cholesteatoma presents with acute onset of vertigo. What is the appropriate treatment?

Accepted Answer

Immediate exploration

Answer

Antibiotics and steroids

Answer

Labyrinthine sedatives and antibiotics

Answer

Labyrinthine sedatives only

Question 9

A patient presents with foul-smelling ear discharge and convulsions. CECT findings reveal a sizable otogenic brain abscess with significant mass effect and raised intracranial pressure. After initiating intravenous antibiotics and stabilization, which source-control procedure should be performed first?

Accepted Answer

Abscess drainage followed by Modified Radical Mastoidectomy (MRM)

Answer

Modified Radical Mastoidectomy (MRM) followed by abscess drainage

Answer

Myringoplasty

Answer

Modified Radical Mastoidectomy (MRM) only

Question 10

Griesinger's sign is seen in which of the following conditions?

Accepted Answer

Lateral sinus thrombosis

Answer

Meningitis

Answer

Brain abscess

Answer

Cerebellar abscess

Otologic and Neurotologic Emergencies — MCQs

Otologic and Neurotologic Emergencies — MCQs

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