Neurotology — MCQs

Neurotology Indian Medical PG Practice Questions and MCQs

Question 231: What is the advantage of flexible bronchoscopy?

A. Can be performed in an awake patient
B. Allows examination of subsegmental bronchi
C. Can be used in patients with jaw and neck abnormalities
D. All of the above (Correct Answer)

Explanation: Flexible bronchoscopy is a versatile diagnostic and therapeutic tool in airway management. Unlike rigid bronchoscopy, which requires general anesthesia and specific neck positioning, the flexible fiberoptic scope offers several distinct advantages: **1. Awake Procedures (Option A):** Flexible bronchoscopy can be performed under local anesthesia (topical lidocaine) with or without conscious sedation. This is crucial for evaluating dynamic airway collapse (tracheomalacia) or performing "awake intubations" in patients with anticipated difficult airways. **2. Distal Reach (Option B):** Due to its small diameter and maneuverability (tip deflection), the flexible scope can navigate beyond the lobar bronchi into the **subsegmental bronchi**. This allows for distal biopsies, brushings, and bronchoalveolar lavage (BAL) in the periphery of the lung, which is impossible with a rigid scope. **3. Anatomical Versatility (Option C):** Rigid bronchoscopy requires "line-of-sight" access, necessitating neck extension and wide jaw opening. Flexible bronchoscopy can be performed via the nasal or oral route and is the preferred method for patients with **cervical spine instability, trismus (lockjaw), or micrognathia**. **Clinical Pearls for NEET-PG:** * **Gold Standard for Foreign Body Removal:** Rigid Bronchoscopy (due to better airway control and larger working channel). * **Gold Standard for Hemoptysis (Massive):** Rigid Bronchoscopy (better suctioning capability). * **Preferred for Peripheral Lesions:** Flexible Bronchoscopy. * **Key Contraindication:** Severe hypoxemia or unstable cardiac status (unless it is to secure the airway).

Question 232: What type of deafness is observed in the early stages of Meniere's disease?

A. Low frequency conductive hearing loss
B. Low frequency sensorineural hearing loss (Correct Answer)
C. High frequency conductive hearing loss
D. High frequency sensorineural hearing loss

Explanation: **Explanation:** **Meniere’s Disease** (Endolymphatic Hydrops) is characterized by an accumulation of endolymph within the cochlear duct and vestibular system. In the **early stages**, the distension of the Reissner’s membrane occurs primarily in the **apex of the cochlea**. Since the apex is responsible for detecting low-frequency sounds, the resulting hearing loss is a **Low-frequency Sensorineural Hearing Loss (SNHL)**. This is often described as an "ascending" audiogram. **Why the other options are incorrect:** * **Options A & C (Conductive Hearing Loss):** Meniere’s disease is a pathology of the inner ear (cochlea); therefore, the hearing loss is always sensorineural, not conductive. Conductive loss involves the external or middle ear. * **Option D (High-frequency SNHL):** High-frequency loss occurs in the later stages of Meniere’s as the disease progresses and involves the base of the cochlea. It is also the hallmark of Presbycusis and Ototoxicity, but not early-stage Meniere’s. **High-Yield Clinical Pearls for NEET-PG:** * **The Triad:** Episodic vertigo, fluctuating SNHL, and tinnitus (often "roaring" in nature). * **Lermoyez Syndrome:** A variant where hearing improves during a vertigo attack. * **Diplacusis:** A common symptom where the same sound is perceived differently in both ears. * **Glycerol Test:** Used for diagnosis; an improvement in hearing after administering glycerol (an osmotic diuretic) confirms endolymphatic hydrops. * **Burn-out Phenomenon:** In late stages, the hearing loss becomes flat and permanent (usually around 50-60 dB).

Question 233: Flick's operation and Cody's procedure are used for which condition?

A. Otosclerosis
B. Meniere's disease (Correct Answer)
C. Atrophic rhinitis
D. Benign paroxysmal positional vertigo

Explanation: **Explanation:** The correct answer is **Meniere’s disease**. Both Fick’s and Cody’s operations are historical surgical procedures designed to address the underlying pathophysiology of Meniere’s disease: **Endolymphatic Hydrops**. 1. **Why Meniere’s Disease is Correct:** Meniere’s disease is characterized by an over-accumulation of endolymph. Surgical management is reserved for cases refractory to medical therapy. * **Fick’s Operation (Sacculotomy):** This involves creating a permanent opening in the footplate of the stapes to puncture the underlying saccule, theoretically allowing excess endolymph to escape. * **Cody’s Tack Operation:** A modification of Fick’s procedure where a small stainless steel "tack" is placed through the stapes footplate. When the saccule distends due to hydrops, it strikes the tack and self-punctures, decompressing the system. 2. **Why Other Options are Incorrect:** * **Otosclerosis:** Managed by **Stapedotomy** or Stapedectomy. It involves bony fixation of the stapes, not endolymphatic pressure issues. * **Atrophic Rhinitis:** A nasal condition managed by procedures like **Young’s operation** or Modified Young’s operation (closing the nostrils). * **BPPV:** Primarily managed by canalith repositioning maneuvers (e.g., **Epley’s maneuver**). Surgery (e.g., Posterior semicircular canal occlusion) is extremely rare. **NEET-PG High-Yield Pearls:** * **Endolymphatic Sac Decompression (ESD):** The most common conservative surgery for Meniere’s. * **Labyrinthectomy/Vestibular Nerve Section:** Destructive procedures used for intractable vertigo when hearing is already lost. * **Chemical Labyrinthectomy:** Intratympanic Gentamicin injection. * **Meniere’s Triad:** Vertigo, Sensorineural hearing loss (fluctuating, low-frequency), and Tinnitus.

Question 234: What is the commonest intracranial complication of Chronic Suppurative Otitis Media (CSOM)?

A. Sub-periosteal abscess
B. Mastoiditis
C. Brain abscess
D. Meningitis (Correct Answer)

Explanation: **Explanation:** **1. Why Meningitis is Correct:** In the context of Chronic Suppurative Otitis Media (CSOM), **Meningitis** is statistically the **most common intracranial complication**. It typically occurs due to the direct spread of infection through pre-formed pathways (like the labyrinth or internal auditory canal) or via retrograde thrombophlebitis of the small veins. Clinically, it presents with the classic triad of fever, headache, and neck rigidity (nuchal rigidity). **2. Why Other Options are Incorrect:** * **Sub-periosteal abscess & Mastoiditis (Options A & B):** These are **extracranial** (intratemporal) complications. While common, the question specifically asks for the commonest *intracranial* complication. Mastoiditis is often the precursor to other complications but is not classified as intracranial. * **Brain abscess (Option C):** This is the **second most common** intracranial complication of CSOM. While it is a significant cause of mortality, it is less frequent than meningitis. Note that the most common site for an otogenic brain abscess is the **Temporal lobe**, followed by the Cerebellum. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common Intracranial complication:** Meningitis. * **Most common Extracranial complication:** Mastoiditis. * **Most common site for Otogenic Brain Abscess:** Temporal lobe (due to spread through the tegmen tympani). * **Sigmoid Sinus Thrombosis:** Look for "Griesinger's sign" (edema over the mastoid) and "Picket-fence fever." * **Gradenigo’s Syndrome:** A complication involving apical petrositis, characterized by the triad of Otorrhea, Retro-orbital pain (V nerve), and Diplopia (VI nerve palsy).

Question 235: Regarding Necrotizing otitis externa, all are true except?

A. Caused by Pseudomonas
B. Surgery is never done (Correct Answer)
C. Facial nerve involved
D. Common in diabetics

Explanation: **Necrotizing Otitis Externa (Malignant Otitis Externa)** is a severe, life-threatening infection of the external auditory canal that spreads to the skull base (osteomyelitis). ### Explanation of Options: * **B. Surgery is never done (Correct Answer):** This statement is **false**, making it the correct choice. While the primary treatment is medical (long-term intravenous antibiotics), surgery is **not** "never" done. Surgery is indicated for the debridement of necrotic tissue, drainage of abscesses, or when medical therapy fails. However, extensive radical surgery (like total temporal bone resection) is generally avoided as it may spread the infection across tissue planes. * **A. Caused by Pseudomonas:** This is **true**. *Pseudomonas aeruginosa* is the causative organism in over 95% of cases. * **C. Facial nerve involved:** This is **true**. As the infection spreads to the skull base (stylomastoid foramen), the facial nerve is the most common cranial nerve affected. Involvement of CN IX, X, XI, and XII indicates further progression (Jugular foramen syndrome). * **D. Common in diabetics:** This is **true**. The disease characteristically affects elderly patients with uncontrolled diabetes mellitus or immunocompromised states. ### Clinical Pearls for NEET-PG: * **Pathognomonic Sign:** Presence of **granulation tissue** at the bony-cartilaginous junction of the external auditory canal. * **Diagnosis:** * **Technetium-99m scan:** Most sensitive for initial diagnosis (detects osteoblastic activity). * **Gallium-67 scan:** Best for **monitoring treatment response** (returns to normal once infection resolves). * **HRCT Temporal Bone:** Best for assessing the extent of bony erosion. * **Treatment of Choice:** Intravenous Ciprofloxacin or third-generation Cephalosporins (Ceftazidime) for 6–8 weeks. Control of blood sugar is mandatory.

Question 236: What is the characteristic triad of Meniere's disease?

A. Fluctuating hearing loss, vertigo, and tinnitus (Correct Answer)
B. Conductive deafness, vertigo, and tinnitus
C. Vertigo, tinnitus, and a sense of fullness
D. Vertigo, tinnitus, and cataract

Explanation: **Explanation:** Meniere’s disease (Endolymphatic Hydrops) is a disorder of the inner ear characterized by an abnormal accumulation of endolymph within the membranous labyrinth. The classic clinical triad consists of **episodic vertigo, fluctuating sensorineural hearing loss (SNHL), and tinnitus.** A fourth symptom, **aural fullness**, is often present, making it a "tetrad" in modern clinical practice. **Why Option A is correct:** The pathophysiology involves distension of the endolymphatic system (hydrops). This leads to: 1. **Vertigo:** Sudden, episodic, and rotatory, usually lasting 20 minutes to several hours. 2. **Fluctuating SNHL:** Characteristically affects low frequencies in the early stages (rising curve on audiometry). 3. **Tinnitus:** Often described as a low-pitched "roaring" or "hissing" sound. **Analysis of Incorrect Options:** * **Option B:** Meniere’s involves the inner ear (cochlea and vestibule), resulting in **Sensorineural** deafness, not conductive deafness. * **Option C:** While these are symptoms of Meniere’s, this option omits the hallmark "hearing loss," which is essential for the classic triad. * **Option D:** Cataract is an ocular pathology and has no clinical association with Meniere’s disease. **NEET-PG High-Yield Pearls:** * **Audiometry:** Early stage shows a **"Rising type"** curve (low-frequency loss); late stage shows a flat or falling curve. * **Recruitment Phenomenon:** Positive (indicates cochlear pathology). * **Glycerol Test:** Used for diagnosis; it is an osmotic diuretic that temporarily reduces endolymphatic pressure, improving hearing. * **Lermoyez Syndrome:** A variant where hearing improves during a vertigo attack ("the reverse Meniere’s"). * **Management:** Medical (Salt restriction, Betahistine, Diuretics) or Surgical (Endolymphatic sac decompression for refractory cases).

Question 237: Otospongiosis is characterized by which mode of inheritance?

A. Autosomal dominant (Correct Answer)
B. Autosomal recessive
C. X-linked dominant
D. X-linked recessive

Explanation: **Explanation:** **1. Why Autosomal Dominant is Correct:** Otosclerosis (or Otospongiosis) is primarily a hereditary localized disease of the bone labyrinth. It follows an **Autosomal Dominant** pattern of inheritance with **incomplete penetrance** (approximately 40%) and **variable expressivity**. This means that while a person may inherit the gene, they may not necessarily manifest the clinical symptoms. Roughly 50% of patients have a positive family history of the condition. **2. Why Other Options are Incorrect:** * **Autosomal Recessive:** This pattern requires two copies of the abnormal gene. While some sporadic cases of otosclerosis occur, the established familial pattern is dominant. * **X-linked (Dominant/Recessive):** These patterns involve genes on the sex chromosomes. Otosclerosis affects both males and females (with a female preponderance of 2:1), and father-to-son transmission is possible, which rules out X-linked inheritance. **3. High-Yield Clinical Pearls for NEET-PG:** * **Demographics:** Most common in females (2:1 ratio), often bilateral, and typically presents in the 2nd to 4th decades of life. * **Triggers:** Clinical symptoms often progress during **pregnancy** or puberty due to hormonal changes. * **Clinical Signs:** * **Schwartze Sign:** Reddish flush on the promontory (active focus). * **Carhart’s Notch:** A characteristic dip in the bone conduction threshold at **2000 Hz**. * **Gelle’s Test:** Negative (indicates stapes fixation). * **Treatment of Choice:** **Stapedotomy** (preferred over stapedectomy) or a hearing aid. Sodium fluoride can be used to mature active foci.

Question 238: Meniere's disease is manifested by all of the following symptoms except:

A. Tinnitus
B. Deafness
C. Vertigo
D. Otorrhoea (Correct Answer)

Explanation: **Explanation:** Meniere’s disease (Endolymphatic Hydrops) is an inner ear disorder characterized by an increase in the volume and pressure of the endolymph. The diagnosis is primarily clinical, based on a classic tetrad of symptoms. **Why Otorrhoea is the Correct Answer:** **Otorrhoea (Option D)** refers to ear discharge. It is a hallmark of external or middle ear pathologies, such as Otitis Externa or Chronic Suppurative Otitis Media (CSOM). Since Meniere’s disease is a non-infectious pathology restricted to the **inner ear** (behind an intact tympanic membrane), it never presents with ear discharge. **Analysis of Incorrect Options:** * **Vertigo (Option C):** Patients experience episodic, paroxysmal rotational vertigo lasting minutes to hours, usually accompanied by nausea and vomiting. * **Deafness (Option B):** It is typically a **Sensory Neural Hearing Loss (SNHL)**. In early stages, it characteristically involves low frequencies and is fluctuant. * **Tinnitus (Option A):** Often described as a low-pitched "roaring" or "hissing" sound, which frequently worsens during acute attacks. **NEET-PG High-Yield Pearls:** 1. **The Tetrad:** Vertigo, SNHL, Tinnitus, and a sense of **Aural Fullness**. 2. **Lermoyez Syndrome:** A variant where hearing improves during a vertigo attack ("the phenomenon of reverse symptoms"). 3. **Burnout Phenomenon:** Over time, vertigo spells may cease as the vestibular system is destroyed, leaving the patient with permanent hearing loss and disequilibrium. 4. **Glycerol Test:** Used for diagnosis; it acts as an osmotic diuretic to temporarily reduce endolymphatic pressure, leading to transient improvement in audiometry. 5. **Management:** Low salt diet and diuretics are first-line; **Betahistine** is used for maintenance.

Question 239: What is the ideal hearing aid for a patient with anotia?

A. In the canal hearing aid
B. Bone anchored hearing aid (Correct Answer)
C. Vestibular implant
D. Transcutaneous hearing aid

Explanation: **Explanation:** **Anotia** is the complete absence of the pinna and the external auditory canal (EAC). This results in a **maximal conductive hearing loss** (approximately 60 dB) because sound waves cannot reach the tympanic membrane through the normal air-conduction pathway. **Why Bone Anchored Hearing Aid (BAHA) is the correct answer:** In patients with anotia or severe canal atresia, traditional air-conduction hearing aids cannot be used because there is no ear canal to house the earmold or transmit sound. A **BAHA** bypasses the external and middle ear by utilizing **bone conduction**. It consists of a surgically implanted titanium fixture in the mastoid bone that osseointegrates, allowing sound vibrations to be transmitted directly to the functioning cochlea (inner ear). **Analysis of Incorrect Options:** * **A. In the canal (ITC) hearing aid:** These require a patent external auditory canal to be inserted. In anotia, the canal is absent, making this physically impossible to use. * **C. Vestibular implant:** This is an experimental device designed to restore balance function in patients with bilateral vestibular loss; it has no role in treating hearing loss. * **D. Transcutaneous hearing aid:** While some BAHA systems are transcutaneous (using magnets), the term is broad. In the context of NEET-PG, the specific gold standard for congenital structural malformations is the **Bone Anchored** system. **High-Yield Clinical Pearls for NEET-PG:** * **Age Criteria:** BAHA is typically FDA-approved for children **above 5 years** of age (due to skull thickness). For children under 5 with anotia, a **BAHA headband** (softband) is used. * **Bilateral Atresia:** If a child has bilateral anotia/atresia, intervention must be early to prevent speech and language delay. * **Treacher Collins Syndrome:** Frequently associated with bilateral microtia/anotia and is a classic indication for BAHA.

Question 240: What is the most common nerve damaged in chronic suppurative otitis media (CSOM)?

A. Cranial Nerve III
B. Cranial Nerve VII (Correct Answer)
C. Cranial Nerve II
D. Cranial Nerve VI

Explanation: **Explanation:** **Why Cranial Nerve VII (Facial Nerve) is Correct:** The facial nerve (CN VII) has a long and complex course through the temporal bone, specifically within the bony **Fallopian canal**. In cases of Chronic Suppurative Otitis Media (CSOM), particularly the **atticoantral (unsafe) type** involving cholesteatoma, the bony canal can be eroded by inflammatory enzymes (osteoclasts) and pressure necrosis. This exposes the nerve to infection and inflammation, leading to facial nerve palsy. The most common site of involvement is the **tympanic (horizontal) segment**, just above the oval window, where the bony covering is naturally thin or dehiscent. **Why the Other Options are Incorrect:** * **Cranial Nerve II (Optic Nerve):** This is a purely sensory nerve for vision and is located intraorbitally and intracranially, far from the middle ear cleft. * **Cranial Nerve III (Oculomotor Nerve):** This nerve controls extraocular muscles and is located in the cavernous sinus and midbrain. It is not anatomically related to the middle ear. * **Cranial Nerve VI (Abducens Nerve):** While CN VI can be involved in ear infections (specifically in **Gradenigo’s Syndrome** due to petrositis), it is much less common than CN VII damage. CN VI involvement presents as lateral rectus palsy. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of facial nerve dehiscence:** Tympanic segment. * **Most common complication of CSOM:** Hearing loss (Conductive); however, the Facial Nerve is the most common **cranial nerve** damaged. * **Gradenigo’s Triad:** Otorrhea, retro-orbital pain (CN V involvement), and diplopia (CN VI palsy). * **Management:** If facial palsy occurs in CSOM, it is a surgical emergency requiring urgent mastoidectomy to decompress the nerve and remove the disease.

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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