Facial Nerve Decompression — MCQs
In Ramsay Hunt syndrome, the most commonly involved nerve is?
A case of bell's palsy on steroids, shows no improvement after two weeks. Next step in management is:
Facial nerve palsy at stylomastoid foramen can cause-
Treatment of choice in traumatic facial nerve injury with delayed onset or incomplete paralysis is -
Picket fence fever is a feature of -
Which of the following statements regarding traumatic facial nerve palsy is false?
Best treatment for traumatic facial nerve injury with no improvement after 3 months?
Which clinical sign can detect facial nerve palsy occurring due to the lesion at the outlet of stylomastoid foramen -
All the following are TRUE of Ramsay-Hunt syndrome EXCEPT
Which skin lesion is associated with Sturge-Weber syndrome?
Facial Nerve Decompression Indian Medical PG Practice Questions and MCQs
Question 1: In Ramsay Hunt syndrome, the most commonly involved nerve is?
- A. a. V
- B. b. VII (Correct Answer)
- C. d. IX
- D. c. VIII
Explanation: ***VII*** - Ramsay Hunt syndrome (herpes zoster oticus) is caused by the reactivation of the **varicella-zoster virus** in the **geniculate ganglion**, which is part of the **facial nerve (cranial nerve VII)** [1]. - This reactivation leads to **unilateral facial paralysis**, often accompanied by **painful vesicular rash** in the ear or mouth, and sometimes **hearing loss** or **vertigo** [1]. *a. V* - Cranial nerve V, the **trigeminal nerve**, is responsible for **facial sensation** and **mastication**. - While **trigeminal neuralgia** can cause severe facial pain, it is not primarily affected in Ramsay Hunt syndrome, nor does it cause facial paralysis. *d. IX* - Cranial nerve IX, the **glossopharyngeal nerve**, is involved in **taste** from the posterior tongue, **swallowing**, and **salivation**. - Involvement of this nerve typically manifests as issues with taste or difficulty swallowing, which are not hallmark features of Ramsay Hunt syndrome. *c. VIII* - Cranial nerve VIII, the **vestibulocochlear nerve**, is responsible for **hearing** and **balance**. - While Ramsay Hunt syndrome can sometimes affect the vestibulocochlear nerve leading to hearing loss or vertigo, the primary and most commonly involved nerve causing the characteristic facial paralysis is the facial nerve (VII).
Question 2: A case of bell's palsy on steroids, shows no improvement after two weeks. Next step in management is:
- A. Steroids dose
- B. Physiotherapy
- C. Electrophysiological Nerve testing (Correct Answer)
- D. Vasodilators and ACTH
Explanation: Electrophysiological Nerve testing - If there's no improvement in Bell's palsy after two weeks on steroids, electrophysiological nerve testing (e.g., electromyography and nerve conduction studies) is crucial to assess the extent of nerve damage and help predict prognosis. - This helps differentiate between demylinating and axonal injury and guide further management or consider alternative diagnoses. [2] Steroids dose - Increasing the steroid dose after initial failure for two weeks is generally not recommended, as the benefit of steroids is primarily seen when initiated early for acute inflammation. [1] - After this period, further steroid use is unlikely to provide additional benefit and may lead to more side effects. Physiotherapy - While physiotherapy is an important adjunct for Bell's palsy recovery, it is usually initiated once there is some evidence of recovery or with persistent facial weakness. - It will not provide diagnostic information regarding the extent of nerve damage or potential underlying causes for the lack of improvement. Vasodilators and ACTH - There is no strong evidence to support the use of vasodilators or ACTH (adrenocorticotropic hormone) alone or in combination for the management of Bell's palsy with or without steroid failure. - These treatments are not standard practice and may carry their own risks without proven efficacy in this condition.
Question 3: Facial nerve palsy at stylomastoid foramen can cause-
- A. Loss of taste sensation in anterior 2/3 of ipsilateral tongue
- B. Loss of lacrimation at side of lesion
- C. Hyperacusis
- D. Loss of corneal reflex at side of lesion (Correct Answer)
Explanation: ***Loss of corneal reflex at side of lesion*** - The **corneal reflex** involves the ophthalmic division of the trigeminal nerve (afferent limb) and the facial nerve (efferent limb) for ipsilateral orbicularis oculi contraction. - A facial nerve palsy at the stylomastoid foramen impairs the efferent component, preventing the **closure of the eyelid** on the affected side [1]. *Loss of taste sensation in anterior 2/3 of ipsilateral tongue* - **Taste sensation** from the anterior two-thirds of the tongue is carried by the **chorda tympani nerve**, which branches off the facial nerve *before* the stylomastoid foramen. - Therefore, a lesion at the stylomastoid foramen would occur *distal* to the origin of the chorda tympani, preserving taste. *Loss of lacrimation at side of lesion* - **Lacrimation** is mediated by the **greater petrosal nerve**, which is a branch of the facial nerve originating *proximal* to the geniculate ganglion. - A lesion at the stylomastoid foramen would be well *after* the greater petrosal nerve has branched off, so lacrimation would be unaffected. *Hyperacusis* - **Hyperacusis** (increased sensitivity to sound) results from paralysis of the **stapedius muscle**, which is innervated by the nerve to stapedius. - The nerve to stapedius branches off the facial nerve *within the temporal bone*, *before* the stylomastoid foramen, so a lesion at the stylomastoid foramen would not cause hyperacusis.
Question 4: Treatment of choice in traumatic facial nerve injury with delayed onset or incomplete paralysis is -
- A. Facial decompression
- B. Masterly inactivity (Correct Answer)
- C. Facial sling
- D. Systemic corticosteroid
Explanation: ***Masterly inactivity*** - In traumatic facial nerve injuries with **delayed onset or incomplete paralysis**, the prognosis for **spontaneous recovery** is excellent (up to 90%). - This approach involves careful observation with serial clinical examinations, allowing time for nerve recovery without the risks of surgical intervention. - **Surgical exploration** is reserved for immediate complete paralysis or when electrodiagnostic tests (electromyography, electroneuronography) show >90% degeneration. *Facial decompression* - This surgical procedure is considered only in cases of **immediate complete paralysis** with temporal bone fractures and confirmed severe nerve degeneration on testing. - It is **not indicated** for delayed-onset or incomplete injuries, as these have excellent spontaneous recovery rates. - Carries risks of further nerve damage, CSF leak, and hearing loss. *Facial sling* - A facial sling is a **late reconstructive procedure** used for permanent facial paralysis when nerve recovery has failed after 1-2 years. - It is a palliative measure to improve facial symmetry and eye protection, not a treatment for acute nerve injury. *Systemic corticosteroid* - While corticosteroids have a role in **Bell's palsy** (idiopathic facial paralysis), their benefit in **traumatic facial nerve injury is unproven**. - The primary pathology in trauma is mechanical disruption, not inflammatory edema that would respond to steroids. - Some clinicians use steroids empirically, but evidence does not support this as standard treatment.
Question 5: Picket fence fever is a feature of -
- A. Lateral sinus thrombophlebitis (Correct Answer)
- B. Acute mastoiditis
- C. Atticoantral CSOM
- D. Bell's Palsy
Explanation: ***Lateral sinus thrombophlebitis*** - **Picket fence fever**, characterized by high spiking fevers followed by abrupt drops to normal or subnormal temperature, is a classic symptom of **lateral sinus thrombophlebitis** due to septic emboli. - This condition is a serious complication of otitis media or mastoiditis, where infection from the middle ear or mastoid spreads to the **dural venous sinuses**. *Acute mastoiditis* - Acute mastoiditis typically presents with **postauricular pain**, swelling, and erythema, often accompanied by ear discharge and fever, but not specifically picket fence fever. - While mastoiditis can lead to lateral sinus thrombophlebitis, it is the underlying infection, not the defining feature of the fever pattern. *Atticoantral CSOM* - **Atticoantral chronic suppurative otitis media (CSOM)**, also known as cholesteatoma, is characterized by chronic ear discharge, hearing loss, and often cholesteatoma formation. - While it can lead to complications, significant systemic fever patterns like picket fence fever are not typical for uncomplicated atticoantral CSOM itself. *Bell's Palsy* - **Bell's Palsy** is an acute peripheral facial nerve paralysis of unknown cause, presenting with unilateral facial weakness or paralysis. - It is not associated with fever, particularly not the cyclical spiking pattern described as picket fence fever, as it is a neurological condition.
Question 6: Which of the following statements regarding traumatic facial nerve palsy is false?
- A. Posttraumatic facial nerve palsy may be complete at the time of presentation
- B. Decompression of the canal can be useful treatment
- C. Usually occurs with longitudinal petrous temporal bone fracture (Correct Answer)
- D. Usually occurs with transverse petrous temporal bone fracture
Explanation: ***Usually occurs with longitudinal petrous temporal bone fracture*** ✓ FALSE - This is the correct answer - **Longitudinal temporal bone fractures** account for the majority (70-80%) of temporal bone fractures but are **less likely to cause severe facial nerve palsy** (10-20% incidence) compared to transverse fractures. - When facial nerve injury does occur with a longitudinal fracture, it typically involves the **tympanic segment** and can be caused by **edema or contusion**, often presenting with delayed or incomplete palsy rather than direct transection. *Usually occurs with transverse petrous temporal bone fracture* - **Transverse temporal bone fractures** are less common (20-30%) but are associated with a **higher incidence and severity of immediate facial nerve paralysis** (30-50% incidence) due to direct nerve transection or severe compression. - These fractures typically cross the **internal auditory canal** and otic capsule, often damaging the labyrinth and facial nerve directly. *Posttraumatic facial nerve palsy may be complete at the time of presentation* - **Complete facial nerve paralysis** can occur immediately after trauma, particularly with **transverse temporal bone fractures**, indicating severe injury such as nerve transection. - Early assessment of the degree of paralysis using the House-Brackmann grading system is crucial for determining prognosis and guiding management strategies. *Decompression of the canal can be useful treatment* - **Surgical decompression of the facial nerve canal** may be considered for patients with **immediate complete paralysis** or **progressive paralysis** following trauma, especially if imaging shows nerve entrapment or significant edema. - The decision for surgery is usually guided by **electrophysiological studies** (electroneuronography showing >90% degeneration) and high-resolution CT imaging to assess the extent of nerve damage and fracture pattern.
Question 7: Best treatment for traumatic facial nerve injury with no improvement after 3 months?
- A. Conservative management
- B. Steroids
- C. Facial nerve decompression (Correct Answer)
- D. Facial sling
Explanation: ***Facial nerve decompression*** - After **3 months without improvement** in traumatic facial nerve injury, electrodiagnostic studies (EMG/NCS) should guide management. - If nerve continuity is maintained but there is **compression from edema, hematoma, or bony fragments**, surgical **decompression** is indicated to relieve pressure and facilitate **nerve regeneration** (which occurs at ~1 mm/day). - This is the appropriate intervention for **severe axonotmesis** where the nerve remains anatomically continuous but functionally impaired due to compression. - Decompression is particularly indicated in **temporal bone fractures** with facial nerve involvement showing no recovery by 3 months. *Conservative management* - Appropriate for **neuropraxia** (temporary conduction block) where spontaneous recovery typically occurs within **6-12 weeks**. - After 3 months of no improvement, continued observation alone would be inappropriate and delay definitive surgical intervention. - The lack of improvement by 3 months suggests **axonotmesis** or **neurotmesis** requiring active surgical management. *Steroids* - Corticosteroids are beneficial in the **acute phase** (first 1-2 weeks) for reducing **edema** and inflammation, particularly in Bell's palsy or acute traumatic injury. - After 3 months, steroids provide **no therapeutic benefit** as the injury pattern is now chronic and likely involves structural nerve damage requiring surgical intervention. - The window for anti-inflammatory therapy has long passed. *Facial sling* - A **static facial sling** is a reconstructive procedure for **permanent, non-recoverable** facial paralysis to improve facial symmetry at rest. - This is considered only after **12-24 months** when all potential for nerve recovery has been exhausted. - It does not address nerve injury or promote regeneration, and would be premature at 3 months when surgical nerve decompression or grafting might still restore function.
Question 8: Which clinical sign can detect facial nerve palsy occurring due to the lesion at the outlet of stylomastoid foramen -
- A. Deviation of tongue towards opposite side
- B. Loss of sensation over right cheek
- C. Loss of taste sensation in anterior 2/3 of tongue
- D. Deviation of angle of mouth towards opposite side (Correct Answer)
Explanation: ***Deviation of angle of mouth towards opposite side*** - A lesion of the facial nerve at the **stylomastoid foramen** specifically affects the motor innervation to the **muscles of facial expression**. [1] - This leads to **paralysis of facial expression muscles** on the ipsilateral side, causing the mouth to **deviate towards the unaffected side** due to unopposed muscle action. [1] *Deviation of tongue towards opposite side* - **Tongue deviation** is primarily indicative of a lesion in the **hypoglossal nerve (CN XII)**, which controls the intrinsic and extrinsic muscles of the tongue. - The facial nerve is not involved in **tongue movement**. *Loss of sensation over right cheek* - **Sensory innervation** to the face, including the cheek, is provided by the **trigeminal nerve (CN V)**, not the facial nerve. - The facial nerve is primarily a **motor nerve** for facial expression, although it carries some sensory fibers for taste and a small area of the ear. *Loss of taste sensation in anterior 2/3 of tongue* - **Taste sensation** from the **anterior two-thirds of the tongue** is carried by the **chorda tympani nerve**, which is a branch of the facial nerve. - However, the **chorda tympani branches off proximal to the stylomastoid foramen**, meaning a lesion at the foramen itself would not affect taste.
Question 9: All the following are TRUE of Ramsay-Hunt syndrome EXCEPT
- A. Ear ache is a symptom
- B. VII nerve involved
- C. Results of spontaneous recovery of facial nerve are 85% (Correct Answer)
- D. Viral aetiology
Explanation: ***Results of spontaneous recovery of facial nerve are 85%*** - The **prognosis** for **facial nerve recovery** in Ramsay Hunt syndrome is significantly poorer than in Bell's palsy, with complete recovery rates often cited between 21% and 75%, and sometimes as low as 30-50%. [1] - The 85% recovery rate refers more commonly to **Bell's palsy**, not Ramsay Hunt syndrome, which typically involves more severe nerve damage due to direct viral neuritis. [1] *Ear ache is a symptom* - **Severe pain** in the ear, often preceding the rash, is a characteristic and prominent symptom of Ramsay Hunt syndrome, which is caused by the **reactivation of varicella-zoster virus** in the geniculate ganglion. - This pain is typically more intense and debilitating than in Bell's palsy, reflecting the inflammatory involvement of sensory nerves. *VII nerve involved* - Ramsay Hunt syndrome is specifically defined by **facial paralysis**, which results from the involvement and **inflammation of the facial nerve (cranial nerve VII)**. [1] - The virus reactivates in the **geniculate ganglion**, affecting the facial nerve, leading to paralysis on one side of the face. *Viral aetiology* - The syndrome is caused by the **reactivation of the varicella-zoster virus (VZV)**, the same virus that causes chickenpox and shingles. - VZV reactivation leads to **inflammation of the geniculate ganglion** and surrounding structures, resulting in characteristic symptoms like facial paralysis and vesicular rash.
Question 10: Which skin lesion is associated with Sturge-Weber syndrome?
- A. Port-wine stain (Correct Answer)
- B. Strawberry nevus
- C. Mongolian spot
- D. Salmon patch
Explanation: ***Port-wine stain*** - A **port-wine stain (nevus flammeus)**, especially when located on the face following the trigeminal nerve distribution, is the characteristic skin lesion of **Sturge-Weber syndrome**. - Sturge-Weber syndrome is a **neurocutaneous disorder** associated with neurological abnormalities like seizures, glaucoma, and leptomeningeal angioma. *Salmon patch* - A **salmon patch (nevus simplex)** is a common, benign vascular lesion typically found on the eyelids, glabella, or nape of the neck. - Unlike a port-wine stain, a salmon patch usually **fades within the first year of life** and is not associated with Sturge-Weber syndrome. *Strawberry nevus* - A **strawberry nevus (infantile hemangioma)** is a common benign vascular tumor that typically appears a few weeks after birth, grows rapidly, and then usually regresses spontaneously by age 5-10. - It is a **raised, bright red lesion** that is distinct from the flat, diffuse appearance of a port-wine stain and not directly linked to Sturge-Weber syndrome. *Mongolian spot* - A **Mongolian spot (dermal melanocytosis)** is a benign, flat, bluish-gray pigmented lesion commonly found on the lower back or buttocks of infants, particularly those with darker skin tones. - It results from **melanocytes trapped in the dermis** and typically fades during childhood, having no association with Sturge-Weber syndrome.
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