Neurotology Practice Questions

Q: Acoustic neuroma commonly affects the:

8th cranial nerve. ***8th cranial nerve*** - An **acoustic neuroma** (also known as a **vestibular schwannoma**) is a benign tumor that arises from the **Schwann cells** of the **vestibular branch** of the **eighth cranial nerve**. - Its presence directly impacts the nerve responsible for **hearing** and **balance**, leading to characteristic symptoms like **unilateral hearing loss**, **tinnitus**, and **vertigo** [1]. *7th cranial nerve* - The **facial nerve (VII)** controls facial expressions and taste sensation from the anterior two-thirds of the tongue. - While an acoustic neuroma can compress the facial nerve in later stages due to its close proximity, it does **not originate from it** [1]. *5th cranial nerve* - The **trigeminal nerve (V)** is responsible for sensation in the face and motor function for chewing. - While it may be affected by large tumors, the **acoustic neuroma** does not originate from or primarily affect the trigeminal nerve. *6th cranial nerve* - The **abducens nerve (VI)** is responsible for the lateral movement of the eye. - It is located further away from the typical origin of an acoustic neuroma and is therefore **less commonly affected** early in the disease course.

Q: In a patient with acoustic neuroma all are seen except:

Acute episode of vertigo. Acoustic neuroma typically presents with unilateral progressive hearing loss and sometimes tinnitus [1]. While acoustic neuromas can cause unsteadiness and gait imbalance due to gradual growth, they typically do not present with acute, severe, isolated vertigo because slow growth allows compensatory brainstem mechanisms to develop [1]. Acute vertigo is more characteristic of peripheral vestibular disorders like benign paroxysmal positional vertigo (BPPV) or Meniere's disease. As an acoustic neuroma (vestibular schwannoma) grows, it can compress the adjacent cerebellum, leading to cerebellar signs [1]. These signs include ataxia, dysmetria, and nystagmus, reflecting cerebellar dysfunction. The facial nerve (CN VII) runs in close proximity to the vestibulocochlear nerve (CN VIII), so it can be affected by an acoustic neuroma, leading to facial paresis or paralysis, though facial weakness is unusual at presentation [1]. Unilateral deafness is a classic and early symptom of acoustic neuroma due to compression of the cochlear portion of CN VIII [1]. The trigeminal nerve (CN V) has sensory innervation to the cornea, and its fibers pass near the cerebellopontine angle where acoustic neuromas grow. Compression of the trigeminal nerve by the tumor can lead to a reduced or absent corneal reflex on the affected side.

Q: Cerebello pontine angle tumour is most commonly:

Acoustic neuroma. Acoustic neuroma - Also known as vestibular schwannoma, it originates from the vestibulocochlear nerve (VIII cranial nerve). - It is by far the most common tumor in the cerebellopontine angle, accounting for about 80% of all CPA tumors. - Typically presents with progressive unilateral hearing loss, tinnitus, and vertigo. Meningioma - Meningiomas are the second most common tumor in the CPA (10-15%), originating from the arachnoid cells of the meninges [1]. - They tend to have a broader attachment base to the dura and demonstrate distinct radiographic features compared to acoustic neuromas. - More common in middle-aged women. Epidermoid cyst - Epidermoid cysts (also called cholesteatomas when congenital) account for about 5% of CPA tumors. - These are benign congenital lesions arising from ectodermal inclusion during neural tube closure. - Characteristically appear as pearly white tumors and show restricted diffusion on MRI. Cholesteatoma - While an acquired cholesteatoma can occur in the skull base and potentially extend to the CPA, it is fundamentally a benign growth of squamous epithelium within the middle ear or mastoid. - It is a less common primary tumor of the CPA compared to acoustic neuroma and typically presents with a history of chronic ear infections and conductive hearing loss.

Q: The first clinical presentation of acoustic neuroma is characterized by ____________

Cochleovestibular symptoms. ***Cochleovestibular symptoms*** - Acoustic neuromas, arising from Schwann cells of the **vestibulocochlear nerve**, commonly cause symptoms related to this nerve first. - Patients typically present with **unilateral hearing loss**, tinnitus, and/or vestibular dysfunction (e.g., disequilibrium, vertigo). *Facial nerve involvement* - **Facial nerve** symptoms (e.g., weakness, numbness) are less common as an initial presentation because the facial nerve is typically compressed later as the tumor grows. - While the facial nerve runs in close proximity, it is usually more resilient to early compression than the vestibulocochlear nerve fibers. *Brainstem involvement* - **Brainstem compression** symptoms (e.g., cranial nerve palsies beyond VII and VIII, long tract signs) occur with larger tumors that extend into the posterior fossa. - These are typically **late manifestations**, indicating significant tumor growth beyond the internal auditory canal. *Cerebellar involvement* - **Cerebellar symptoms** (e.g., ataxia, dysmetria) are also late findings, occurring when the tumor is large enough to compress the cerebellum. - These are not usually the initial clinical presentation due to the tumor's origin from the eighth cranial nerve.

Q: Among the following non-auditory signs, which appears earliest in acoustic neuroma?

Diminished corneal sensitivity. ***Diminished corneal sensitivity*** - The **corneal reflex** is mediated by the **trigeminal nerve (CN V)**, which has a close anatomical relationship with the vestibulo-cochlear nerve (CN VIII) within the cerebellopontine angle. - Early compression of CN V by an enlarging **acoustic neuroma** can lead to diminished corneal sensitivity before more widespread neurological deficits appear. *Congestion of conjunctiva* - This symptom is non-specific and not directly associated with the early stages of an **acoustic neuroma**. - Conjunctival congestion can be caused by various factors, including irritation, allergies, or infections, and does not indicate cranial nerve involvement. *Diplopia* - **Diplopia (double vision)** typically occurs due to involvement of the extraocular motor nerves (CN III, IV, or VI) or brainstem compression. - This is generally a later sign and requires significant tumor growth to affect these structures, making it less likely to be an earliest non-auditory symptom. *Ptosis* - **Ptosis (drooping eyelid)** is caused by dysfunction of the oculomotor nerve (CN III) or the sympathetic nervous system (Horner's syndrome). - These nerves are usually affected later in the course of an **acoustic neuroma** once the tumor has grown significantly and compressed adjacent structures distant from its initial growth site.

Q: Hyperacusis in Bell's palsy is due to the paralysis of the following muscle:

Stapedius. ***Stapedius*** - The **stapedius muscle** is innervated by the **facial nerve (CN VII)** via the nerve to stapedius. Paralysis of this muscle in Bell's palsy leads to hyperacusis because it can no longer dampen loud sounds. - Its normal function is to contract and pull the **stapes posteriorly**, dampening the **ossicular chain movement** and reducing excessive sound transmission to the inner ear during loud noise exposure (acoustic reflex). *Levator palatini* - This muscle is primarily involved in **soft palate elevation** for swallowing and speech. It is innervated by the **vagus nerve (CN X)**, not the facial nerve. - Its paralysis would affect **speech (hypernasality)** and **swallowing**, but not hearing sensitivity. *Tensor tympani* - The **tensor tympani muscle** is innervated by the **trigeminal nerve (CN V3)** and its contraction pulls the **malleus** medially, stiffening the **tympanic membrane**. - While it also helps to dampen sound, its dysfunction is not directly responsible for hyperacusis in Bell's palsy, as the dominant facial nerve involvement affects the stapedius. *Tensor veli palatini* - This muscle **tenses the soft palate** and **opens the Eustachian tube** during swallowing and yawning. It is innervated by the **trigeminal nerve (CN V3)**. - Its dysfunction would primarily affect **Eustachian tube function** and soft palate tension, not auditory sensitivity.

Q: A patient presents with painful vesicles in the ear and tongue. He also complains of facial weakness and hearing loss. What is the diagnosis?

Ramsay hunt syndrome. ***Ramsay hunt syndrome*** - This syndrome is characterized by a **herpes zoster oticus** (shingles affecting the ear) combined with **facial nerve palsy**, leading to **facial weakness** [1], [2]. - Symptoms include painful vesicular rash in the external auditory canal (ear), sometimes extending to the tongue or soft palate, **ipsilateral facial paralysis**, and often **hearing loss** or **vertigo** [1]. *Fungal infection* - Fungal infections in the ear (otomycosis) typically cause **itching**, discharge, and pain, but rarely present with **vesicles**, **facial weakness**, or widespread vesicular lesions on the tongue. - They are not associated with nerve palsies like **facial weakness** and **hearing loss** in the manner seen in Ramsay Hunt syndrome. *Chicken pox* - **Chickenpox (varicella)** is a generalized vesicular rash that is typically widespread over the body [3], while Ramsay Hunt syndrome involves **localized vesicular lesions** with associated cranial nerve dysfunction. - While caused by the same virus (**Varicella-Zoster Virus**), chickenpox is the primary infection whereas Ramsay Hunt syndrome is a reactivation [1], [3]. *None of the options* - This option is incorrect as Ramsay Hunt syndrome perfectly matches the described clinical presentation of **painful vesicles** in the ear and tongue, **facial weakness**, and **hearing loss**.

Q: In acoustic neuroma, cranial nerve to be involved earliest is

Cranial nerve VIII. ***Cranial nerve VIII*** - Acoustic neuromas (vestibular schwannomas) arise from the **Schwann cells** of the vestibular branch of the **eighth cranial nerve (vestibulocochlear nerve)** [1]. - Due to their origin, symptoms related to CN VIII, such as **unilateral hearing loss**, **tinnitus**, and **vertigo**, are typically the earliest to appear [1]. *Cranial nerve VII* - The **facial nerve (CN VII)** is anatomically close to the eighth nerve within the **internal auditory canal**, but its involvement usually occurs later as the tumor grows and compresses it [1]. - Early involvement of CN VII would primarily manifest as **facial weakness or paralysis** or taste disturbances [1]. *Cranial nerve IX* - The **glossopharyngeal nerve (CN IX)** is located more medially in the **cerebellopontine angle** and is typically affected only by larger tumors. - Symptoms would primarily include **dysphagia (difficulty swallowing)** or loss of taste on the posterior tongue. *Cranial nerve V* - The **trigeminal nerve (CN V)** is also situated in the cerebellopontine angle, further from the initial growth site of an acoustic neuroma. - Involvement of CN V would lead to **facial numbness**, pain, or weakness in the muscles of mastication, which are late manifestations.

Q: Which of the following would be the most appropriate treatment for rehabilitation of a patient, who has bilateral profound deafness following surgery for bilateral acoustic schwannoma?

Brainstem implant. ***Brainstem implant*** - A **brainstem implant** is the most appropriate treatment when the auditory nerve has been damaged or destroyed, as can occur during bilateral acoustic schwannoma surgery. - This device bypasses the cochlea and auditory nerve by directly stimulating the **cochlear nucleus** in the brainstem, allowing sound perception. *Bilateral cochlear implant* - A **cochlear implant** requires an intact auditory nerve to transmit signals from the cochlea to the brain. - In this scenario, bilateral profound deafness post-surgery for acoustic schwannoma often implies damage to both **auditory nerves**, rendering cochlear implants ineffective. *Unilateral cochlear implant* - Similar to a bilateral cochlear implant, a **unilateral cochlear implant** relies on the functionality of at least one auditory nerve. - Since the patient has **bilateral profound deafness** following bilateral surgery, the auditory nerves are likely compromised on both sides, making even a unilateral implant unsuitable. *Bilateral high powered digital hearing aid* - Hearing aids amplify sound and rely on the presence of residual hair cell function in the **cochlea** and an intact auditory pathway. - Profound deafness indicates severe damage to the inner ear or auditory nerve, which hearing aids cannot overcome as they only provide *amplification*, not direct neural stimulation.

Q: Acoustic neuroma commonly arises from which of the following nerves?

Inferior division of vestibular nerve. ***Inferior division of vestibular nerve*** - Acoustic neuromas, also known as **vestibular schwannomas**, originate from the **Schwann cells** lining the vestibular portion of the **eighth cranial nerve (CN VIII)** [1]. - Approximately **60-70%** of acoustic neuromas arise from the **inferior division of the vestibular nerve**, making it the most common site of origin. - The inferior vestibular nerve innervates the saccule and posterior semicircular canal. *Superior division of vestibular nerve* - While acoustic neuromas can arise from the **superior division of the vestibular nerve**, this is **less common** than the inferior division. - The superior division innervates the utricle and anterior/lateral semicircular canals. - When tumors do arise here, they present with similar symptoms of hearing loss and balance disturbance. *Cochlear nerve* - The **cochlear nerve** is responsible for transmitting auditory information to the brain. - Although it is part of the **vestibulocochlear nerve (CN VIII)**, acoustic neuromas rarely arise primarily from the cochlear portion. - However, auditory symptoms (hearing loss, tinnitus) commonly occur due to tumor compression of the cochlear nerve. *IXth nerve* - The **IXth cranial nerve** is the **glossopharyngeal nerve**, which is involved in taste, swallowing, and sensation from the pharynx. - Tumors of the glossopharyngeal nerve are extremely rare and are not classified as acoustic neuromas. - Acoustic neuromas are specific to the vestibulocochlear nerve (CN VIII).

Question 1

Acoustic neuroma commonly affects the:

Accepted Answer

8th cranial nerve

Answer

7th cranial nerve

Answer

5th cranial nerve

Answer

6th cranial nerve

Question 2

In a patient with acoustic neuroma all are seen except:

Accepted Answer

Acute episode of vertigo

Answer

Cerebellar signs

Answer

Facial nerve may be involved with unilateral deafness

Answer

Reduced corneal reflex

Question 3

Cerebello pontine angle tumour is most commonly:

Accepted Answer

Acoustic neuroma

Answer

Cholesteatoma

Answer

Epidermoid cyst

Answer

Meningioma

Question 4

The first clinical presentation of acoustic neuroma is characterized by ____________

Accepted Answer

Cochleovestibular symptoms

Answer

Facial nerve involvement

Answer

Brainstem involvement

Answer

Cerebellar involvement

Question 5

Among the following non-auditory signs, which appears earliest in acoustic neuroma?

Accepted Answer

Diminished corneal sensitivity

Answer

Congestion of conjunctiva

Answer

Diplopia

Answer

Ptosis

Question 6

Hyperacusis in Bell's palsy is due to the paralysis of the following muscle:

Accepted Answer

Stapedius

Answer

Levator palatini

Answer

Tensor tympani

Answer

Tensor veli palatini

Question 7

A patient presents with painful vesicles in the ear and tongue. He also complains of facial weakness and hearing loss. What is the diagnosis?

Accepted Answer

Ramsay hunt syndrome

Answer

Fungal infection

Answer

Chicken pox

Answer

None of the options

Question 8

In acoustic neuroma, cranial nerve to be involved earliest is

Accepted Answer

Cranial nerve VIII

Answer

Cranial nerve VII

Answer

Cranial nerve IX

Answer

Cranial nerve V

Question 9

Which of the following would be the most appropriate treatment for rehabilitation of a patient, who has bilateral profound deafness following surgery for bilateral acoustic schwannoma?

Accepted Answer

Brainstem implant

Answer

Bilateral cochlear implant

Answer

Unilateral cochlear implant

Answer

Bilateral high powered digital hearing aid

Question 10

Acoustic neuroma commonly arises from which of the following nerves?

Accepted Answer

Inferior division of vestibular nerve

Answer

IXth nerve

Answer

Cochlear nerve

Answer

Superior division of vestibular nerve

Neurotology — MCQs

Neurotology — MCQs

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