Neurotology Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Neurotology. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Neurotology Indian Medical PG Question 1: A 25-year-old woman presents with episodes of dizziness, tinnitus, and hearing loss in the right ear. What is the most likely diagnosis?
- A. Labyrinthitis
- B. Ménière's disease (Correct Answer)
- C. Acoustic neuroma
- D. Benign paroxysmal positional vertigo
Neurotology Explanation: ***Ménière's disease***
- This condition is characterized by a classic triad of **episodic vertigo (dizziness)**, fluctuating **sensorineural hearing loss**, and **tinnitus**, often accompanied by aural fullness, typically affecting one ear.
- The symptoms arise from an accumulation of **endolymph** in the inner ear, leading to increased pressure and dysfunction.
*Labyrinthitis*
- **Labyrinthitis** is an inflammation of the inner ear, usually viral, causing sudden, severe **vertigo** potentially with hearing loss and tinnitus.
- Unlike Meniere's disease, **hearing loss** and **tinnitus** in labyrinthitis are usually constant rather than episodic or fluctuating.
*Acoustic neuroma*
- An **acoustic neuroma** (vestibular schwannoma) is a benign tumor on the eighth cranial nerve, often causing **gradual, progressive unilateral hearing loss**, tinnitus, and **balance issues**, but typically not episodic severe dizziness.
- While it can cause hearing loss and tinnitus, the **episodic nature of vertigo** is less common than in Ménière's disease.
*Benign paroxysmal positional vertigo*
- **BPPV** is characterized by sudden, **brief episodes of vertigo** triggered by specific head movements, caused by dislodged **otoconia** in the semicircular canals.
- Critically, BPPV does **not** typically cause associated **hearing loss or tinnitus**, which are prominent symptoms in the presented case.
Neurotology Indian Medical PG Question 2: Cervical Vestibular Evoked Myogenic Potential (cVEMP) detects lesion of -
- A. Inferior Vestibular Nerve (Correct Answer)
- B. Cochlear Nerve
- C. Facial Nerve
- D. Superior Vestibular Nerve
Neurotology Explanation: ***Inferior Vestibular Nerve***
- **cVEMP** primarily assesses the function of the **saccule** and its neural pathway via the **inferior vestibular nerve (IVN)**.
- The saccule is sensitive to **vertical head movements and linear acceleration** and transmits signals through the IVN to the vestibulospinal pathway.
- cVEMP is recorded from the **sternocleidomastoid muscle** and reflects the **vestibulocollic reflex**.
*Cochlear Nerve*
- The **cochlear nerve** is responsible for **auditory processing** and is assessed by tests like audiometry and ABR, not VEMPs.
- While it's part of the vestibulocochlear nerve (CN VIII), its function is distinct from vestibular assessment.
*Facial Nerve*
- The **facial nerve (CN VII)** controls **facial muscles** and taste sensation, with no direct role in vestibular function.
- Lesions are detected through facial movement assessment and electrophysiological tests like electroneuronography (ENoG).
*Superior Vestibular Nerve*
- The **superior vestibular nerve (SVN)** primarily innervates the **anterior and horizontal semicircular canals** and the **utricle**.
- Its function is assessed by **oVEMP (ocular VEMP)**, **caloric reflex test**, or **head impulse test**, rather than cVEMP.
Neurotology Indian Medical PG Question 3: The commonest cranial nerve involved in acoustic neuroma is:
- A. X
- B. VIII (Correct Answer)
- C. IX
- D. VI
Neurotology Explanation: ***Correct Answer: VIII (Vestibulocochlear Nerve)***
- Acoustic neuroma, also known as **vestibular schwannoma**, arises from the **Schwann cells** of the **vestibular branch of cranial nerve VIII**.
- Its symptoms, such as **hearing loss**, **tinnitus**, and **balance problems**, directly result from the compression and dysfunction of the vestibulocochlear nerve.
- This is the **primary nerve involved** as the tumor originates from it.
*Incorrect: X (Vagus Nerve)*
- The **vagus nerve (cranial nerve X)** is involved in diverse functions like **swallowing, phonation, and parasympathetic innervation of organs**.
- While a large acoustic neuroma can eventually affect adjacent cranial nerves, it is not the primary nerve involved or the origin of the tumor.
*Incorrect: IX (Glossopharyngeal Nerve)*
- The **glossopharyngeal nerve (cranial nerve IX)** is primarily responsible for **taste, salivation, and sensation from the pharynx**.
- Involvement of this nerve typically presents with symptoms like **dysphagia** or altered taste, which are not initial or common features of an acoustic neuroma.
*Incorrect: VI (Abducens Nerve)*
- The **abducens nerve (cranial nerve VI)** controls the **lateral rectus muscle**, responsible for moving the eye outward.
- Involvement would lead to **diplopia** or a convergent squint, which occurs only in very large acoustic neuromas that cause significant brainstem compression.
Neurotology Indian Medical PG Question 4: Progressive loss of hearing, tinnitus and ataxia are commonly seen in a case of -
- A. Acoustic neuroma (Correct Answer)
- B. Otitis media
- C. Ependymoma
- D. Cerebral glioma
Neurotology Explanation: ***Acoustic neuroma***
- This benign tumor arises from the **vestibulocochlear nerve (cranial nerve VIII)**, leading to **progressive unilateral hearing loss**, **tinnitus**, and **ataxia** as it compresses the adjacent cerebellum [1].
- The symptoms are progressive and often insidious, reflecting the slow growth of the tumor, and are highly characteristic for this condition [1].
*Otitis media*
- **Otitis media** is an **inflammation/infection of the middle ear**, primarily causing ear pain, ear discharge, and conductive hearing loss.
- While it causes hearing loss, it typically presents with acute symptoms and does not typically cause **tinnitus** or **ataxia** unless there are severe complications affecting the inner ear or brain.
*Ependymoma*
- **Ependymomas** are tumors originating from the **ependymal cells** lining the ventricles and spinal cord, often causing symptoms related to increased intracranial pressure (headache, nausea) or spinal cord compression.
- They do not typically present with the specific triad of **progressive hearing loss**, **tinnitus**, and **ataxia** characteristic of acoustic neuroma.
*Cerebral glioma*
- **Cerebral gliomas** are brain tumors that arise from glial cells and present with a wide range of neurological symptoms depending on their location, such as **seizures**, **weakness**, or **cognitive changes**.
- They are unlikely to present with the specific combination of **progressive hearing loss**, **tinnitus**, and **ataxia** unless located in the brainstem or cerebellum in a way that specifically compresses the eighth cranial nerve and cerebellar pathways, which is less common than for an acoustic neuroma.
Neurotology Indian Medical PG Question 5: The first clinical presentation of acoustic neuroma is characterized by ____________
- A. Cochleovestibular symptoms (Correct Answer)
- B. Facial nerve involvement
- C. Brainstem involvement
- D. Cerebellar involvement
Neurotology Explanation: ***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.
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