Management of Facial Paralysis — MCQs
Best treatment for traumatic facial nerve injury with no improvement after 3 months?
Which of the following is not true about Bell’s palsy?
All of the following are true regarding Bell's palsy except:
In Ramsay Hunt syndrome, all nerves are involved except
Most common cause of facial nerve palsy is -
Evidence based therapy of Bell's palsy include(s):
A patient presents with facial nerve palsy and vertigo after mastoid surgery. The most likely site of injury is:
Treatment of choice in traumatic facial nerve injury with delayed onset or incomplete paralysis is -
What type of fracture of petrous temporal bone has the highest chance of facial nerve paralysis?
Lower lip paralysis after a parotidectomy is most likely due to injury to which structure?
Management of Facial Paralysis Indian Medical PG Practice Questions and MCQs
Question 1: 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 2: Which of the following is not true about Bell’s palsy?
- A. Bilateral presentation (Correct Answer)
- B. Facial asymmetry
- C. Loss of taste
- D. Hyperacusis
Explanation: ***Bilateral presentation*** - **Bell's palsy** is an **idiopathic acute peripheral facial palsy** that is almost always **unilateral**. [1] - **Bilateral facial paralysis** is rare and typically points to an underlying systemic cause, such as **Guillain-Barré syndrome** or **Lyme disease**, rather than Bell's palsy. *Facial asymmetry* - **Facial asymmetry** is a cardinal diagnostic sign of Bell's palsy, resulting from **unilateral weakness** of the facial muscles. [1] - This weakness leads to features like a **drooping mouth corner**, inability to close the eye, and loss of forehead wrinkles on the affected side. [1] *Loss of taste* - **Loss of taste (ageusia)** on the anterior two-thirds of the tongue is a common symptom in Bell's palsy. - This occurs because the **chorda tympani nerve**, a branch of the facial nerve, carries taste fibers from this region. *Hyperacusis* - **Hyperacusis**, an increased sensitivity to everyday sounds, can occur in Bell's palsy. - This is due to paralysis of the **stapedius muscle**, which is innervated by the facial nerve and normally dampens sound transmission to the inner ear.
Question 3: All of the following are true regarding Bell's palsy except:
- A. Unilateral facial weakness
- B. Steroids are the treatment of choice
- C. Immediate nerve decompression is required (Correct Answer)
- D. Herpes simplex virus is commonly implicated
Explanation: ***Immediate nerve decompression is required*** - **Bell's palsy** is typically managed with medical therapy, primarily **steroids**, to reduce inflammation and promote recovery. - **Surgical decompression** of the facial nerve is rarely indicated and is not a standard or immediate treatment. *Unilateral facial weakness* - This is the **hallmark symptom** of Bell's palsy, affecting one side of the face. - Patients experience difficulty with facial expressions, eye closure, and oral competence [1]. *Steroids are the treatment of choice* - **Corticosteroids**, such as prednisone, are the primary treatment to reduce inflammation of the **facial nerve (cranial nerve VII)** [1]. - Early initiation of steroids significantly improves the chances of full recovery [1]. *Herpes simplex virus is commonly implicated* - **Reactivation of HSV-1** is thought to be a major underlying cause, leading to inflammation and swelling of the facial nerve. - Other viruses, such as **varicella-zoster virus (VZV)**, can also cause facial paralysis (Ramsay Hunt syndrome), which is clinically distinct.
Question 4: In Ramsay Hunt syndrome, all nerves are involved except
- A. 7
- B. 5
- C. 9 (Correct Answer)
- D. 6
- E. 8
Explanation: Cranial nerve IX, the **glossopharyngeal nerve**, is typically *not involved* in the classic presentation of Ramsay Hunt syndrome, which primarily affects facial and auditory nerves. - Involvement of CN IX would present with symptoms like **dysphagia** or loss of taste on the posterior tongue, which are not characteristic features of the syndrome. Cranial nerve VII, the **facial nerve**, is the *primary nerve affected* in Ramsay Hunt syndrome, causing **facial paralysis** on the affected side [1]. - This paralysis results from reactivation of the **varicella-zoster virus** in the geniculate ganglion. Cranial nerve V, the **trigeminal nerve**, can occasionally be affected, leading to **facial pain** or numbness in the distribution of its sensory branches. - While not a primary feature, its involvement can contribute to the severity and discomfort experienced by patients. Cranial nerve VI, the **abducens nerve**, can be involved in Ramsay Hunt syndrome, leading to **diplopia** due to impairment of the **lateral rectus muscle**. - Its involvement is considered an *atypical presentation* but has been documented in severe cases. Cranial nerve VIII, the **vestibulocochlear nerve**, is frequently involved, causing **vertigo**, **nystagmus**, and **hearing loss** (sensorineural) on the affected side. - This involvement is due to the close proximity of the vestibulocochlear ganglion to the geniculate ganglion.
Question 5: Most common cause of facial nerve palsy is -
- A. Sarcoidosis
- B. Acoustic neuroma
- C. VZV
- D. Bell's Palsy (Correct Answer)
Explanation: ***Bell's Palsy*** - **Bell's Palsy** is the most common cause of **unilateral facial nerve palsy**, accounting for approximately 70% of all cases. It is an **idiopathic** condition, meaning its exact cause is unknown, but it is often linked to viral infections like HSV-1 [1]. - It presents as an **acute onset of facial muscle weakness or paralysis** on one side, involving both the upper and lower face. Unlike Bell's palsy, lesions with an upper motor neuron origin partly spare the upper face [1]. *Sarcoidosis* - **Sarcoidosis** can cause facial nerve palsy, but it is a relatively uncommmon etiology, often associated with other systemic symptoms like **uveitis** or **parotid enlargement**. - Facial palsy in sarcoidosis is part of a broader neurological manifestation and is much less frequent than Bell's Palsy. *Acoustic neuroma* - An **acoustic neuroma** (vestibular schwannoma) is a tumor that grows on the **vestibulocochlear nerve (CN VIII)**. It typically causes hearing loss, tinnitus, and balance issues [2]. - While it can eventually affect the facial nerve (CN VII) due to its proximity, facial nerve involvement is usually *not* the primary or most common presenting symptom, nor is it the most common cause of facial nerve palsy overall [2]. *VZV* - **Varicella-zoster virus (VZV)** infection can cause facial nerve palsy in the form of **Ramsay Hunt syndrome (Herpes zoster oticus)**. This is characterized by facial palsy accompanied by a painful **vesicular rash** in the ear canal or on the auricle. - While a significant cause of facial palsy, it is less common than Bell's Palsy and has distinct associated symptoms.
Question 6: Evidence based therapy of Bell's palsy include(s):
- A. Steroid (Correct Answer)
- B. Facial nerve massage
- C. Acyclovir
- D. Facial nerve stimulation
Explanation: ***Steroid*** - **Corticosteroids**, such as prednisone, are the mainstay of treatment for Bell's palsy, particularly when initiated early (within 72 hours of symptom onset) [1]. - They work by reducing **inflammation and swelling** of the facial nerve, which can alleviate compression and promote recovery. *Facial nerve massage* - While supportive therapies like physical therapy can be helpful for **muscle re-education** and preventing contractures, facial nerve massage itself is not an evidence-based therapy for improving nerve function in acute Bell's palsy. - Its efficacy in **nerve regeneration** or speeding recovery has not been scientifically proven. *Acyclovir* - **Antivirals** like acyclovir or valacyclovir are sometimes used in conjunction with steroids if a **herpes simplex virus (HSV) etiology** is suspected, but their standalone use for Bell's palsy is not evidence-based and their benefit in addition to steroids is debated [1]. - The primary evidence points to a viral etiology in some cases, but the direct benefit of antivirals over steroids alone is not consistently robust across studies. *Facial nerve stimulation* - **Electrical stimulation** of the facial nerve is not recommended and may even be harmful in the acute phase of Bell's palsy. - It has not been shown to improve outcomes and can potentially impede natural nerve regeneration or cause **synkinesis** [1].
Question 7: A patient presents with facial nerve palsy and vertigo after mastoid surgery. The most likely site of injury is:
- A. Vertical segment (Correct Answer)
- B. Geniculate ganglion
- C. Tympanic segment
- D. Labyrinthine segment
Explanation: ***Vertical segment (Mastoid segment)*** - The **vertical (mastoid) segment** of the facial nerve descends through the mastoid bone from the second genu to the stylomastoid foramen. - This segment is **most vulnerable during mastoidectomy** due to its course through the surgical field, particularly in patients with dehiscent facial nerve canals or anatomical variations. - Injury manifests as **facial nerve palsy** (complete or partial facial weakness). - **Vertigo** occurs when surgical trauma extends to adjacent structures like the **semicircular canals** (especially the lateral/horizontal canal which lies close to the mastoid antrum) or causes thermal injury to the vestibular apparatus. - This combined presentation of facial palsy + vertigo points specifically to the vertical segment injury during mastoid surgery. *Labyrinthine segment* - The **labyrinthine segment** is the shortest and narrowest segment, running from the internal auditory canal to the geniculate ganglion. - It lies **deep within the petrous temporal bone**, far from the typical mastoid surgical field. - Injury here is rare during mastoidectomy unless there is extensive petrous bone drilling or complications. - Would cause facial palsy and potentially hearing loss, but is not the typical site of injury during mastoid surgery. *Geniculate ganglion* - The **geniculate ganglion** is located at the first genu where the facial nerve transitions from labyrinthine to tympanic segment. - It lies **medial and superior** to the middle ear cavity, protected by bone. - Injury would cause facial palsy, loss of taste (anterior 2/3 tongue via chorda tympani), hyperacusis (stapedius dysfunction), and decreased lacrimation. - **Less commonly injured** during routine mastoidectomy; vertigo is not a primary feature unless there is extension to the vestibular apparatus. *Tympanic segment* - The **tympanic (horizontal) segment** runs along the medial wall of the middle ear above the oval window. - While it can be exposed during mastoidectomy with extended approaches, it is **less frequently injured** than the vertical segment in standard mastoid surgery. - Injury causes facial palsy but **vertigo is less characteristic** unless the procedure directly involves the oval window or horizontal semicircular canal.
Question 8: 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 9: What type of fracture of petrous temporal bone has the highest chance of facial nerve paralysis?
- A. All have equal incidence
- B. Transverse (Correct Answer)
- C. Oblique
- D. Longitudinal
Explanation: ***Transverse*** - **Transverse fractures** of the petrous temporal bone run perpendicular to the long axis of the petrous bone and are typically caused by direct blows to the occiput or high-energy trauma. - These fractures have the **highest incidence (30-50%)** of facial nerve paralysis due to direct involvement of the facial nerve within the petrous canal, often resulting in complete and immediate paralysis from transection or severe crush injury. *All have equal incidence* - This is incorrect because the incidence of facial nerve paralysis varies significantly depending on the **type and direction of the fracture** pattern. - Different fracture orientations impact the facial nerve's intricate intratemporal course in distinct ways, resulting in markedly different injury rates. *Oblique* - **Oblique fractures** are less common and their impact on the facial nerve is variable, generally considered intermediate between longitudinal and transverse fractures. - The specific angulation and degree of facial canal involvement determine the risk, but the incidence is typically lower than transverse fractures. *Longitudinal* - **Longitudinal fractures** run parallel to the long axis of the petrous bone, typically resulting from lateral temporal impacts. - These fractures have a **much lower incidence (10-20%)** of facial nerve paralysis, usually incomplete and often due to edema or hematoma rather than direct nerve transection, as they tend to spare the facial nerve's intratemporal course.
Question 10: Lower lip paralysis after a parotidectomy is most likely due to injury to which structure?
- A. Buccal branch of the facial nerve
- B. Cervical branch of the facial nerve
- C. Temporal branch of the facial nerve
- D. Marginal mandibular branch of the facial nerve (Correct Answer)
Explanation: ***Marginal mandibular branch of the facial nerve*** - The **marginal mandibular branch** innervates the muscles of the lower lip and chin, including the **depressor anguli oris**, **depressor labii inferioris**, and **mentalis**. - Injury to this nerve during a **parotidectomy**, where it can be inadvertently cut or damaged due to its superficial course over the mandible, results in ipsilateral **lower lip paralysis** and an asymmetric smile. *Buccal branch of the facial nerve* - The **buccal branch** primarily innervates the muscles around the mouth, such as the buccinator and orbicularis oris, affecting **upper lip movement** and cheek function. - Damage to this branch would typically affect functions like chewing and smiling, but not specifically the lower lip. *Cervical branch of the facial nerve* - The **cervical branch** innervates the **platysma muscle**, which is involved in neck skin tension and depressing the mandible. - Injury to this branch would cause weakness or paralysis of the platysma, not lower lip paralysis. *Temporal branch of the facial nerve* - The **temporal branch** innervates the muscles of the forehead and around the eye, including the **frontalis** and **orbicularis oculi**. - Damage to this branch would result in the inability to wrinkle the forehead and close the eye, but not lower lip paralysis.
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