Facial Nerve Paralysis — 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:
Which of the following is NOT a feature of facial nerve palsy?
All the following are TRUE of Ramsay-Hunt syndrome EXCEPT
Herpes zoster in geniculate ganglion causes?
All of the following are true regarding Bell's palsy except:
Most common cause of facial nerve palsy is -
A patient presents with facial nerve palsy and vertigo after mastoid surgery. The most likely site of injury is:
Lower lip paralysis after a parotidectomy is most likely due to injury to which structure?
A 62-year-old patient presents with left-sided arm and leg weakness, right-sided facial paralysis with lateral rectus gaze palsy, and nystagmus. Based on the clinical presentation, which of the following syndromes is most consistent with these symptoms?
Facial Nerve Paralysis 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: Which of the following is NOT a feature of facial nerve palsy?
- A. Loss of lacrimation
- B. Facial muscle paralysis
- C. Loss of taste sensation from posterior tongue (Correct Answer)
- D. Loss of salivation
Explanation: Loss of taste sensation from posterior tongue - The **facial nerve (CN VII)** carries taste fibers from the **anterior two-thirds of the tongue** via the **chorda tympani**. - **Taste sensation** from the **posterior one-third of the tongue** is mediated by the **glossopharyngeal nerve (CN IX)**, so its loss would not be a feature of facial nerve palsy. *Loss of lacrimation* - The facial nerve provides **parasympathetic innervation** to the **lacrimal glands** via the **greater petrosal nerve**. - Damage to the facial nerve proximal to the geniculate ganglion can lead to **reduced tear production** on the affected side. [1] *Facial muscle paralysis* - The facial nerve is the primary motor nerve for the **muscles of facial expression**. [1] - Injury to this nerve results in varying degrees of **weakness or paralysis** of the facial muscles, leading to drooping and difficulty with facial movements. [1] *Loss of salivation* - The facial nerve carries **parasympathetic fibers** to the **submandibular** and **sublingual salivary glands** via the **chorda tympani**. - A lesion affecting the facial nerve can therefore impair **salivary gland function**, leading to reduced saliva production.
Question 4: 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 5: Herpes zoster in geniculate ganglion causes?
- A. Melkersson-Rosenthal syndrome
- B. Ramsay Hunt syndrome (Correct Answer)
- C. Bell's palsy
- D. Ophthalmic zoster
Explanation: ***Ramsay Hunt syndrome*** - This syndrome is caused by the **reactivation of varicella-zoster virus (VZV)** within the **geniculate ganglion**, leading to inflammation of the facial nerve (cranial nerve VII). - Key features include **ipsilateral facial paralysis**, **ear pain**, and a **vesicular rash in the external auditory canal** or on the auricle. *Melkersson-Rosenthal syndrome* - This is a rare neurological disorder characterized by a triad of symptoms: **recurrent facial paralysis**, **persistent orofacial swelling**, and **fissured tongue**. - It is not directly related to viral infection or the geniculate ganglion. *Bell's palsy* - Bell's palsy is an **idiopathic facial paralysis** that results from inflammation of the facial nerve, but the exact cause is unknown and it does not involve a vesicular rash. - While it shares some symptoms with Ramsay Hunt syndrome, the **absence of vesicles** distinguishes it. *Ophthalmic zoster* - Ophthalmic zoster occurs when VZV reactivates in the **trigeminal ganglion** (cranial nerve V), specifically affecting the ophthalmic division. - It presents with a **vesicular rash on the forehead, eyelids, and nose** (Hutchinson's sign), and can lead to serious ocular complications, but does not involve the facial nerve directly.
Question 6: 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 7: 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 8: 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 9: 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.
Question 10: A 62-year-old patient presents with left-sided arm and leg weakness, right-sided facial paralysis with lateral rectus gaze palsy, and nystagmus. Based on the clinical presentation, which of the following syndromes is most consistent with these symptoms?
- A. Foville syndrome (Correct Answer)
- B. Benedict's syndrome
- C. Millard-Gubler syndrome
- D. Wallenberg syndrome
Explanation: ***Foville syndrome*** - This syndrome is characterized by a **pontine lesion** affecting the **abducens nucleus (cranial nerve VI)**, leading to ipsilateral gaze palsy, and the **facial nucleus (cranial nerve VII)**, causing ipsilateral facial weakness. [1] - The **crossed hemiparesis (left-sided arm and leg weakness)** results from involvement of the corticospinal tracts, and **nystagmus** can occur due to vestibular nucleus involvement, consistent with the patient's presentation. [1] *Benedict's syndrome* - This is a midbrain syndrome involving the **red nucleus** and **oculomotor nerve (cranial nerve III)**, causing ipsilateral oculomotor palsy and contralateral cerebellar ataxia. - It does not explain the patient's **facial weakness** or **abducens palsy**. *Millard-Gubler syndrome* - This pontine syndrome involves the **abducens nerve (cranial nerve VI)** and **facial nerve (cranial nerve VII)** in the pontine base, leading to ipsilateral gaze palsy and ipsilateral facial paralysis. - However, the hemiparesis in Millard-Gubler syndrome is typically **contralateral** to the lesion, but the facial paralysis and gaze palsy are usually due to direct nerve involvement rather than nuclear involvement, and **nystagmus** is not a characteristic feature. *Wallenberg syndrome* - This syndrome, also known as **lateral medullary syndrome**, is caused by a lesion in the **dorsolateral medulla** and presents with a constellation of symptoms including **ipsilateral ataxia**, **Horner's syndrome**, **high-pitched dysphagia**, and **contralateral loss of pain and temperature sensation**. [1] - It does not typically involve **facial weakness**, **abducens palsy**, or **hemiparesis** in the manner described.
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