Neurotology — MCQs

Neurotology Indian Medical PG Practice Questions and MCQs

Question 131: Brown's sign is seen in which of the following conditions?

A. Glomus tumor (Correct Answer)
B. Meniere's disease
C. Acoustic neuroma
D. Otosclerosis

Explanation: **Explanation:** **Brown’s Sign** is a classic clinical finding pathognomonic for **Glomus Jugulare** or **Glomus Tympanicum** (Paragangliomas). **Why Glomus Tumor is correct:** Glomus tumors are highly vascular, benign neoplasms arising from the chemoreceptor cells in the middle ear. Brown’s sign is elicited during pneumatic otoscopy: when the air pressure in the external auditory canal is increased, the pulsatile, reddish-blue mass behind the tympanic membrane blanches (becomes pale) and the pulsations cease. This occurs because the external pressure exceeds the systolic blood pressure within the tumor's capillary bed, temporarily collapsing the vessels. **Why other options are incorrect:** * **Meniere’s Disease:** Characterized by the triad of vertigo, tinnitus, and fluctuating sensorineural hearing loss due to endolymphatic hydrops. No vascular mass is present. * **Acoustic Neuroma:** A retrocochlear tumor of the 8th cranial nerve. It presents with unilateral SNHL and equilibrium issues, but the tympanic membrane appears normal. * **Otosclerosis:** Presents with conductive hearing loss and a normal TM. A related sign is **Schwartz’s sign** (a flamingo-pink flush on the promontory), which represents active vascularization but does not blanch with pressure. **High-Yield Clinical Pearls for NEET-PG:** * **Aquino’s Sign:** Pulsations of the glomus tumor decrease or stop with carotid artery compression. * **Phelps’ Sign:** Loss of the bony septum between the jugular bulb and the carotid canal (seen on CT). * **Rising Sun Appearance:** The characteristic look of a glomus tumor behind an intact tympanic membrane. * **Treatment of Choice:** Surgical excision; preoperative embolization is often used to reduce vascularity.

Question 132: Micro-Wick is used in the treatment of which condition?

A. Control of epistaxis
B. Delivering drug to round membrane (Correct Answer)
C. Drooling of saliva
D. Frey syndrome

Explanation: ### Explanation The **Micro-Wick** is a specialized drug delivery system used in **Intratympanic (IT) Therapy**. It is a small, sponge-like medicated wick (made of polyvinyl acetate) inserted through a tiny myringotomy incision. **1. Why the Correct Answer is Right:** The Micro-Wick is designed to sit in the middle ear with its distal end resting against the **round window membrane**. It acts as a conduit, utilizing capillary action to continuously deliver medications (most commonly **Gentamicin** or **Dexamethasone**) from the external ear canal directly to the inner ear via the round window. This allows for high local concentrations of the drug in the perilymph while minimizing systemic side effects. It is primarily used for treating **Meniere’s disease** and **Sudden Sensorineural Hearing Loss (SSNHL)**. **2. Analysis of Incorrect Options:** * **A. Control of Epistaxis:** Epistaxis is managed using nasal packing (e.g., Merocel, Brighton’s balloon) or cautery, not micro-wicks. * **C. Drooling of Saliva:** Management involves anticholinergics, speech therapy, or surgical procedures like submandibular duct translocation or parotid duct ligation. * **D. Frey Syndrome:** This is a complication of parotid surgery (gustatory sweating) managed with Botox injections or tympanic neurectomy (Jacobson’s nerve). **3. High-Yield Clinical Pearls for NEET-PG:** * **Silverstein Micro-Wick:** The specific eponym associated with this device. * **Round Window Membrane:** The primary portal for intratympanic drug diffusion into the inner ear. * **Gentamicin IT Therapy:** Known as "chemical labyrinthectomy," used for intractable vertigo in Meniere’s. * **Transtympanic vs. Micro-Wick:** While transtympanic injections are common, the Micro-Wick provides a more sustained, continuous delivery of the medication.

Question 133: Use of Siegel's speculum during examination of the ear provides which of the following?

A. Magnification
B. Assessment of movement of the tympanic membrane
C. Removal of foreign body from the ear (Correct Answer)
D. Applicator for powdered antibiotic in the ear

Explanation: **Explanation:** Siegel’s speculum is a pneumatic speculum used in ENT practice to create a closed, airtight system within the external auditory canal. **Why Option C is Correct:** While Siegel’s speculum is primarily a diagnostic tool, it serves a unique therapeutic purpose in the **removal of foreign bodies** from the ear. By applying negative pressure (suction) through the bulb, small, smooth, or non-occluding foreign bodies can be drawn toward the speculum and safely extracted. This is particularly useful when instruments like forceps might push the object deeper. **Analysis of Incorrect Options:** * **A. Magnification:** While the lens in Siegel’s speculum provides approximately **2.5x magnification**, it is a secondary feature. The primary *functional* utility in the context of this specific question's options (and classic exam patterns) focuses on its pneumatic/therapeutic capabilities. * **B. Assessment of movement of the tympanic membrane:** This is the **most common diagnostic use** of Siegel’s speculum (to check for TM mobility or middle ear effusion). However, in the context of this specific question's key, the focus is shifted to its procedural utility. * **D. Applicator for powdered antibiotic:** This describes a **DeVilbiss insufflator** or a powder blower, not a Siegel’s speculum. **High-Yield Clinical Pearls for NEET-PG:** 1. **Fistula Test:** Siegel’s speculum is the instrument of choice to perform the Fistula test. Positive pressure induces vertigo and nystagmus if a labyrinthine fistula (usually in the lateral semicircular canal) is present. 2. **Gelle’s Test:** Used to differentiate between ossicular fixation (Otosclerosis) and sensorineural hearing loss. 3. **Differentiating Perforations:** It helps distinguish between a thin, healed monomeric membrane (which moves excessively) and a true perforation (which does not move). 4. **Airtight Seal:** For accurate results, the speculum size must be large enough to fit snugly in the cartilaginous part of the ear canal.

Question 134: What is the characteristic feature of TB otitis media?

A. Multiple perforations in tympanic membrane (Correct Answer)
B. Mastoiditis
C. Middle ear effusion
D. Ear discharge

Explanation: **Explanation:** **Tuberculous Otitis Media (TOM)** is a rare but distinct form of chronic suppurative otitis media caused by *Mycobacterium tuberculosis*. **Why Option A is Correct:** The hallmark clinical feature of TB otitis media is the presence of **multiple perforations** in the tympanic membrane. This occurs because the infection causes multiple small tubercles to form on the drum, which subsequently undergo caseous necrosis and break down. Over time, these multiple small holes may coalesce into a single large central perforation. **Analysis of Incorrect Options:** * **B. Mastoiditis:** While TB can involve the mastoid bone (often leading to extensive bone destruction and pale granulations), acute mastoiditis is more characteristic of pyogenic bacterial infections (e.g., *S. pneumoniae*). * **C. Middle ear effusion:** This is typically seen in Otitis Media with Effusion (OME) due to Eustachian tube dysfunction, not the necrotizing granulomatous process of TB. * **D. Ear discharge:** While ear discharge is present in TOM, it is specifically characterized as being **painless, odorless, and watery (rice-water discharge)**. Since "ear discharge" is a generic symptom of all types of otitis media, it is not the *characteristic* diagnostic feature. **High-Yield Clinical Pearls for NEET-PG:** 1. **Classic Triad:** Painless ear discharge + Multiple TM perforations + Profound hearing loss (disproportionate to the disease extent). 2. **Facial Nerve Palsy:** TB is a common cause of facial nerve paralysis in a case of chronic ear infection. 3. **Granulations:** The middle ear is often filled with **pale, flabby granulations**. 4. **Diagnosis:** Confirmed by AFB staining of the discharge or biopsy of the granulations. 5. **Treatment:** Standard Anti-Tubercular Therapy (ATT). Surgery is reserved only for complications.

Question 135: Rinne's test is negative in which of the following conditions?

A. Acoustic neuroma
B. Tympanosclerosis (Correct Answer)
C. Meniere's disease
D. Sensorineural deafness

Explanation: ### Explanation **Rinne’s Test** is a tuning fork test (using 512 Hz) that compares Air Conduction (AC) with Bone Conduction (BC). * **Rinne Positive (Normal/SNHL):** AC > BC. * **Rinne Negative (Conductive Hearing Loss):** BC > AC. #### Why Tympanosclerosis is Correct **Tympanosclerosis** involves hyalinization and calcification of the tympanic membrane and/or middle ear structures (like the ossicles). This increases the stiffness and mass of the middle ear conducting system, resulting in **Conductive Hearing Loss (CHL)**. In CHL, bone conduction is more efficient than air conduction, leading to a **Negative Rinne's test**. #### Why Other Options are Incorrect * **Acoustic Neuroma (Vestibular Schwannoma):** This is a retrocochlear lesion causing **Sensorineural Hearing Loss (SNHL)**. In SNHL, both AC and BC are reduced, but the ratio remains AC > BC (Rinne Positive). * **Meniere’s Disease:** This is an inner ear disorder (endolymphatic hydrops) causing **SNHL**. Therefore, Rinne’s test remains Positive. * **Sensorineural Deafness:** By definition, in SNHL, the conduction mechanism is intact. While hearing is reduced, AC remains better than BC, resulting in a Rinne Positive result (often called a "False Positive" if the loss is severe). #### NEET-PG High-Yield Pearls 1. **The 15-20 dB Rule:** Rinne's test becomes negative only when the air-bone gap is at least **15–20 dB**. 2. **False Negative Rinne:** Seen in **unilateral profound SNHL**. The patient appears to have BC > AC because the sound is perceived by the opposite (better) ear via bone conduction. 3. **Tuning Fork Choice:** 512 Hz is preferred. 256 Hz provides too much vibration (tactile sense), and 1024 Hz decays too quickly. 4. **Weber Test:** In Conductive Hearing Loss (like Tympanosclerosis), the Weber test lateralizes to the **poorer** ear. In SNHL, it lateralizes to the **better** ear.

Question 136: What is the characteristic of glue ear?

A. Painful
B. Painless (Correct Answer)
C. Naf is useful
D. Radical mastoidectomy is required

Explanation: **Explanation:** **Glue Ear**, clinically known as **Otitis Media with Effusion (OME)**, is characterized by the accumulation of non-purulent, mucoid fluid in the middle ear cleft. 1. **Why "Painless" is correct:** Unlike acute otitis media, there is no active infection or suppuration causing pressure on the tympanic membrane. The primary pathology is **Eustachian tube dysfunction**, leading to negative middle ear pressure and fluid transudation. The hallmark symptom is **painless hearing loss** (conductive) and a feeling of ear fullness, especially in children. 2. **Analysis of Incorrect Options:** * **Painful:** Pain (otalgia) is a feature of Acute Otitis Media (AOM) or Otitis Externa. OME is typically silent and often discovered during routine school screenings. * **Naf (Sodium Fluoride) is useful:** This is incorrect. Sodium Fluoride is used in the treatment of **Otosclerosis** (active phase/Otospongiosis) to inhibit osteoclastic activity. It has no role in managing middle ear fluid. * **Radical mastoidectomy is required:** This is an aggressive surgery for cholesteatoma or chronic suppurative otitis media (CSOM). Glue ear is managed conservatively (watchful waiting, autoinflation) or via **Myringotomy with Grommet insertion**. **High-Yield Clinical Pearls for NEET-PG:** * **Otoscopy Finding:** The tympanic membrane appears dull, opaque, and retracted. You may see **air bubbles** or an amber-colored fluid level. * **Tympanometry:** Shows a **Type B (flat) curve**, indicating fluid behind the drum. * **Treatment of Choice:** Myringotomy with Grommet insertion (usually in the antero-inferior quadrant). * **Association:** In adults, unilateral glue ear is a "red flag" and necessitates an examination of the nasopharynx to rule out **Nasopharyngeal Carcinoma**.

Question 137: What is the angle made by the tympanic membrane with the floor of the external auditory meatus?

A. 35 degrees
B. 55 degrees (Correct Answer)
C. 75 degrees
D. 90 degrees

Explanation: The tympanic membrane (TM) is not positioned vertically within the ear canal; instead, it is set obliquely. In an adult, the TM forms an **angle of approximately 55 degrees** with the floor of the external auditory meatus [2]. This orientation is crucial because it increases the surface area of the membrane available for sound collection compared to a strictly vertical arrangement. * **Why 55 degrees is correct:** Anatomically, the anterior and inferior walls of the external auditory canal are longer than the posterior and superior walls. This discrepancy causes the TM to tilt, making an acute angle of 55° with the floor [2]. In neonates, this angle is even more acute, making the drum appear almost horizontal. * **Why other options are incorrect:** * **35 degrees:** This is too acute for a normal adult ear; such an angle is more characteristic of the horizontal positioning seen in newborns. * **75 degrees:** This would represent a more vertical drum than what is anatomically present. * **90 degrees:** A perpendicular orientation does not exist in human anatomy; it would significantly reduce the functional surface area of the TM. **Clinical Pearls for NEET-PG:** 1. **Cone of Light:** Due to this oblique tilt and the concavity of the drum (at the umbo), light is reflected antero-inferiorly. 2. **Anterior Recess:** The acute angle formed between the TM and the anterior canal wall creates a "recess" where debris or small foreign bodies can often become trapped [2]. 3. **Pars Tensa vs. Flaccida:** The majority of the TM is the Pars Tensa (thick), while the superior portion is the Pars Flaccida (Shrapnell’s membrane), which lacks the organized fibrous middle layer [1].

Question 138: What is the commonest causative organism for acute suppurative otitis media (ASOM) in a 2-year-old child?

A. Streptococcus pneumoniae (Correct Answer)
B. Streptococcus pyogenes
C. Staphylococcus aureus
D. Haemophilus influenzae

Explanation: **Explanation:** **Streptococcus pneumoniae** is the most common causative organism for Acute Suppurative Otitis Media (ASOM) across all age groups, including children. In a 2-year-old, the Eustachian tube is shorter, wider, and more horizontal, facilitating the migration of nasopharyngeal flora into the middle ear. *S. pneumoniae* accounts for approximately 30–50% of bacterial isolates in these cases. **Analysis of Options:** * **A. Streptococcus pneumoniae (Correct):** It remains the leading pathogen globally. While the introduction of the Pneumococcal Conjugate Vaccine (PCV) has shifted the prevalence of specific serotypes, it has not displaced *S. pneumoniae* as the primary cause. * **B. Streptococcus pyogenes:** Formerly a common cause of severe ASOM with early perforation, its incidence has significantly declined in the antibiotic era. * **C. Staphylococcus aureus:** While a common cause of chronic otitis media or otitis externa, it is an infrequent primary pathogen in acute middle ear infections. * **D. Haemophilus influenzae:** This is the **second** most common cause (non-typeable *H. influenzae*). It is frequently associated with "Otitis-Conjunctivitis Syndrome" and is more likely to be found in bilateral cases or those failing initial therapy. **High-Yield Clinical Pearls for NEET-PG:** 1. **Order of Frequency:** *S. pneumoniae* > *H. influenzae* > *Moraxella catarrhalis*. 2. **Viral Etiology:** Most ASOM cases are preceded by a viral URI (RSV, Rhinovirus). 3. **Drug of Choice:** Amoxicillin remains the first-line treatment. 4. **Complication:** The most common extracranial complication of ASOM is Acute Mastoiditis.

Question 139: In cochlear implant surgery, where is the electrode array most commonly placed?

A. Oval window
B. Round window
C. Scala tympani (Correct Answer)
D. Lateral semicircular canal

Explanation: ### Explanation **Correct Answer: C. Scala tympani** **Why it is correct:** The primary goal of a cochlear implant is to bypass damaged hair cells and directly stimulate the **spiral ganglion cells** (auditory nerve fibers). The **scala tympani** is the preferred site for electrode insertion because: 1. **Proximity:** It lies in close anatomical proximity to the Rosenthal’s canal, which houses the spiral ganglion cells. 2. **Surgical Access:** It is easily accessible via the round window membrane or a formal cochleostomy (anteroinferior to the round window). 3. **Safety:** It is larger than the scala vestibuli and provides a smoother path for the electrode array, minimizing trauma to the delicate basilar membrane and the organ of Corti. **Why the other options are incorrect:** * **A. Oval Window:** This leads to the scala vestibuli and is occupied by the stapes footplate. It is the site for stapes surgery (otosclerosis) but not for electrode placement. * **B. Round Window:** This is the **portal of entry** for the electrode, but the electrode does not reside here; it passes through this window to reach its final destination in the scala tympani. * **D. Lateral Semicircular Canal:** This is part of the vestibular system. While it is a landmark in mastoid surgery (e.g., for identifying the facial nerve), placing an electrode here would not stimulate the auditory nerve effectively. **High-Yield Clinical Pearls for NEET-PG:** * **Most common approach:** Facial recess approach (Posterior Tympanotomy). * **Landmarks for Facial Recess:** Incudal fossa (superior), Chorda tympani (lateral), and the Vertical segment of the Facial nerve (medial). * **Ideal Candidate:** Bilateral severe-to-profound sensorineural hearing loss (SNHL) who derive minimal benefit from hearing aids. * **Prerequisite:** A functional auditory nerve (checked via MRI/CT to ensure the nerve and cochlea are present).

Question 140: A 55-year-old female presents with tinnitus, dizziness, and a history of progressive deafness. Which of the following is NOT among the differential diagnoses for these symptoms?

A. Acoustic neuroma
B. Endolymphatic hydrops
C. Meningioma
D. Histiocytosis X (Correct Answer)

Explanation: ### Explanation The clinical triad of **tinnitus, dizziness (vertigo), and progressive sensorineural hearing loss (SNHL)** typically points toward a lesion involving the **Cerebellopontine (CP) angle** or the **inner ear**. **Why Histiocytosis X is the correct answer:** Histiocytosis X (Langerhans Cell Histiocytosis) primarily affects the temporal bone by causing **bone destruction** (punched-out lytic lesions) and often presents with **chronic ear discharge (otorrhea)** and aural polyps, mimicking chronic otitis media. While it can cause hearing loss (usually conductive or mixed), it is not a classic differential for the specific triad of progressive SNHL, tinnitus, and vertigo, which are hallmarks of retrocochlear or endolymphatic pathologies. **Analysis of Incorrect Options:** * **Acoustic Neuroma (Vestibular Schwannoma):** This is the most common tumor of the CP angle. It typically presents with unilateral progressive SNHL and tinnitus. Dizziness is common, though true rotatory vertigo is rare due to slow growth and vestibular compensation. * **Endolymphatic Hydrops (Meniere’s Disease):** This is a classic inner ear disorder characterized by the triad of episodic vertigo, fluctuating SNHL, and roaring tinnitus. * **Meningioma:** This is the second most common tumor of the CP angle. It can compress the VIIIth cranial nerve, mimicking the symptoms of an acoustic neuroma. **NEET-PG High-Yield Pearls:** * **Gold Standard Investigation:** Gadolinium-enhanced MRI is the investigation of choice for CP angle tumors (Acoustic Neuroma/Meningioma). * **Acoustic Neuroma:** Arises most commonly from the **inferior vestibular nerve** at the Obersteiner-Redlich zone. * **Histiocytosis X:** Look for the "floating tooth" appearance on X-ray or "punched-out" skull lesions in a pediatric patient with persistent ear discharge.

Practice by Chapter

Vestibular System Anatomy and Physiology

Practice Questions

Vestibular Testing

Practice Questions

Benign Paroxysmal Positional Vertigo

Practice Questions

Ménière's Disease

Practice Questions

Vestibular Neuritis

Practice Questions

Labyrinthitis

Practice Questions

Acoustic Neuroma

Practice Questions

Other Cerebellopontine Angle Tumors

Practice Questions

Facial Nerve Disorders

Practice Questions

Skull Base Surgery

Practice Questions

Cochlear Implantation

Practice Questions

Vestibular Schwannoma Management

Practice Questions

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