Neurotology — MCQs

Neurotology Indian Medical PG Practice Questions and MCQs

Question 121: Which of the following is NOT characteristic of Ramsay Hunt syndrome?

A. Facial palsy
B. Vesicles in the external auditory canal
C. Vertigo
D. Palatal myoclonus (Correct Answer)

Explanation: **Ramsay Hunt Syndrome (Herpes Zoster Oticus)** is caused by the reactivation of the **Varicella Zoster Virus (VZV)** in the **geniculate ganglion** of the facial nerve. ### Why Palatal Myoclonus is the Correct Answer **Palatal myoclonus** is a rhythmic, involuntary contraction of the soft palate. It is typically associated with lesions in the **Guillain-Mollaret triangle** (involving the red nucleus, inferior olive, and dentate nucleus of the cerebellum), often following a brainstem stroke. It is not a feature of Ramsay Hunt syndrome, which is a peripheral lower motor neuron pathology. ### Explanation of Incorrect Options * **Facial Palsy (Option A):** This is a hallmark of the syndrome. Reactivation in the geniculate ganglion causes inflammation and compression of the **VII cranial nerve**, leading to lower motor neuron facial paralysis (often more severe than Bell’s palsy). * **Vesicles in the EAC (Option B):** VZV affects the sensory cutaneous branches of the facial nerve (and sometimes VIII, IX, and X). This results in a painful herpetic rash or vesicles in the **concha, external auditory canal (EAC), and tympanic membrane**. * **Vertigo (Option C):** The virus frequently spreads to the adjacent **VIII cranial nerve** (Vestibulocochlear nerve). This leads to vestibulocochlear symptoms, including **vertigo**, sensorineural hearing loss, and tinnitus. ### High-Yield Clinical Pearls for NEET-PG * **Triad of Ramsay Hunt:** Facial paralysis, ear pain (otalgia), and herpetic vesicles. * **Nerves Involved:** Primarily VII, but can involve VIII, IX, X, V, and VI. * **Prognosis:** Generally poorer recovery of facial function compared to Bell’s palsy. * **Treatment:** Combination of high-dose **Corticosteroids** and **Antivirals** (Acyclovir/Valacyclovir). * **Hitchelberger’s Sign:** Reduced sensation in the posterior-superior wall of the EAC (seen in Acoustic Neuroma, but sometimes confused with sensory findings here).

Question 122: Which of the following statements is FALSE regarding malignant otitis externa?

A. ESR is useful in monitoring the response to antibiotics.
B. Sensorineural hearing loss is a common presentation. (Correct Answer)
C. It is common in diabetics.
D. Granulation tissue is present in the external ear canal.

Explanation: ### Explanation **Malignant Otitis Externa (MOE)**, also known as Necrotizing Otitis Externa, is a life-threatening progressive infection of the external auditory canal and skull base, typically caused by *Pseudomonas aeruginosa*. **Why Option B is False (The Correct Answer):** The primary hearing deficit in MOE is **Conductive Hearing Loss**, resulting from edema, debris, and granulation tissue obstructing the external ear canal. While the infection can spread to the skull base (causing cranial nerve palsies, most commonly CN VII), it rarely involves the inner ear directly to cause sensorineural hearing loss (SNHL). If SNHL occurs, it is a late, rare complication of labyrinthitis or extensive petrous apicitis. **Analysis of Other Options:** * **Option A (ESR):** Erythrocyte Sedimentation Rate (ESR) is almost always significantly elevated in MOE. It is a highly sensitive marker used to **monitor treatment response**; a falling ESR indicates effective therapy. * **Option C (Diabetes):** MOE characteristically affects **elderly diabetic patients** (90% of cases) or immunocompromised individuals. The microangiopathy and high tissue glucose levels facilitate pseudomonal spread. * **Option D (Granulation Tissue):** The hallmark clinical finding is the presence of **granulation tissue at the bony-cartilaginous junction** of the external auditory canal floor. **NEET-PG High-Yield Pearls:** * **Pathogen:** *Pseudomonas aeruginosa* is the most common causative agent. * **Diagnosis:** Technetium-99m scan is used for initial diagnosis (detects osteoblastic activity); **Gallium-67 scan** is used to monitor resolution (detects active infection). * **Cranial Nerve Involvement:** The **Facial Nerve (CN VII)** is the most frequently affected nerve as it exits the stylomastoid foramen. * **Treatment:** Long-term intravenous antipseudomonal antibiotics (e.g., Ciprofloxacin, Ceftazidime). Control of diabetes is crucial.

Question 123: In the Bing test, alternately compressing and relaxing the tragus causes the sound to increase and decrease. This finding indicates:

A. Sensorineural hearing loss (Correct Answer)
B. Adhesive otitis media
C. Otosclerosis
D. Chronic suppurative otitis media

Explanation: ### Explanation The **Bing test** is a tuning fork test used to differentiate between conductive hearing loss (CHL) and sensorineural hearing loss (SNHL) by assessing the **occlusion effect**. #### 1. Why Sensorineural Hearing Loss is Correct In a normal ear or an ear with SNHL, the external auditory canal is open. When the canal is artificially occluded (by pressing the tragus or using a finger), the loudness of a bone-conducted sound increases. This is because occlusion prevents the escape of low-frequency sound waves from the canal, reflecting them back to the tympanic membrane. * **Positive Bing Test:** If the patient perceives the sound as **pulsating** (louder when the tragus is pressed and softer when released), it indicates a normal middle ear mechanism. This occurs in **normal hearing** and **SNHL**. #### 2. Why the Other Options are Incorrect * **Negative Bing Test:** In conditions where a **conductive hearing loss** is already present (Options B, C, and D), the ear is effectively "already occluded" by the pathology (fluid, ossicular fixation, or perforation). * **Otosclerosis (C) and Adhesive Otitis Media (B):** These involve ossicular stiffness. Since a conductive block already exists, manual occlusion of the tragus produces **no change** in sound intensity. * **CSOM (D):** Middle ear pathology and/or perforation eliminate the occlusion effect. #### 3. Clinical Pearls for NEET-PG * **The Concept:** Bing test assesses the **Occlusion Effect**. * **Positive Bing:** Sound fluctuates (Normal/SNHL). * **Negative Bing:** No change in sound (CHL). * **Comparison:** The Bing test is physiologically similar to the **Gelle’s test**, which uses a Siegle’s speculum to increase air pressure in the canal. A "normal" Gelle’s (sound decreases with pressure) also indicates an intact ossicular chain/SNHL, while a "negative" Gelle’s indicates Otosclerosis.

Question 124: Acoustic reflex is lost in case of which of the following conditions?

A. Stapedial palsy (Correct Answer)
B. Glomus tumour
C. Internal ear pathology
D. Malingering

Explanation: The acoustic reflex (stapedial reflex) is an involuntary muscle contraction in the middle ear in response to high-intensity sound. It involves the **Stapedius muscle**, which is innervated by the **Facial nerve (CN VII)**. ### **Why Stapedial Palsy is Correct** The acoustic reflex arc consists of: * **Afferent limb:** Cochlear nerve (CN VIII) * **Center:** Superior Olivary Complex and Facial Nerve Nucleus in the brainstem. * **Efferent limb:** Facial nerve (CN VII) to the Stapedius muscle. In **Stapedial palsy** (often seen in Bell’s palsy or lesions proximal to the nerve to stapedius), the efferent limb is broken. The muscle cannot contract, leading to a **lost reflex** and clinical **hyperacusis** (sensitivity to loud sounds). ### **Analysis of Incorrect Options** * **B. Glomus Tumour:** While a large glomus tumour can physically restrict ossicular movement, the reflex is typically "reduced" or shows an "inverted" pattern on impedance audiometry rather than being primarily lost due to nerve pathology. * **C. Internal Ear Pathology:** Sensory (cochlear) hearing loss only abolishes the reflex if the loss is severe (>60-70 dB). In mild-to-moderate cochlear loss, the reflex is often **present** at lower-than-expected intensities due to **Recruitment** (Metz Recruitment Test). * **D. Malingering:** A malingerer (someone faking hearing loss) will have a **normal, present acoustic reflex**, as the reflex is involuntary and cannot be suppressed by the patient. ### **High-Yield Clinical Pearls** * **Site of Lesion:** If the acoustic reflex is present in a patient with Facial Nerve palsy, the lesion is **distal** to the nerve to stapedius. * **Reflex Decay:** If the reflex cannot be maintained for 10 seconds, it indicates **Retrocochlear pathology** (e.g., Vestibular Schwannoma). * **Otosclerosis:** Characteristically shows an **absent reflex** due to fixation of the stapes footplate.

Question 125: The fistula test stimulates which structure?

A. Lateral semicircular canal (Correct Answer)
B. Posterior semicircular canal
C. Anterior semicircular canal
D. Cochlea

Explanation: ### Explanation **1. Why the Lateral Semicircular Canal (LSCC) is Correct:** The fistula test is performed by applying positive or negative pressure to the external auditory canal (using a Siegel’s speculum or tragal pressure). In the presence of a **labyrinthine fistula**—most commonly caused by a cholesteatoma eroding the bony labyrinth—this pressure is transmitted directly to the endolymph. Because the **Lateral Semicircular Canal** is the most lateral and superficial part of the vestibular system, it is the most frequent site of erosion (85–90% of cases). The pressure change induces endolymph movement, stimulating the crista ampullaris, which results in vertigo and nystagmus (Hennebert’s sign). **2. Why the Other Options are Incorrect:** * **Posterior and Anterior Semicircular Canals:** While these are part of the vestibular system, they are located deeper within the petrous temporal bone and are rarely the primary site of erosion in chronic suppurative otitis media (CSOM). * **Cochlea:** The cochlea is responsible for hearing (auditory function). While a fistula can rarely involve the promontory, the fistula test specifically looks for a vestibular response (nystagmus/vertigo), which is a function of the semicircular canals. **3. Clinical Pearls for NEET-PG:** * **Hennebert’s Sign:** A "false positive" fistula test (nystagmus without a bony fistula). It is classically seen in **Meniere’s disease** (due to adhesions between the stapes footplate and saccule) and **Congenital Syphilis**. * **False Negative Test:** May occur if the fistula is plugged by cholesteatoma or granulation tissue, or if the labyrinth is "dead" (non-functional). * **Management:** A positive fistula test in the context of CSOM is an absolute indication for surgery (Mastoidectomy) to prevent labyrinthitis or intracranial complications.

Question 126: A patient with a history of right ear discharge undergoes mastoidectomy. Postoperatively, the patient presents with vertigo and deafness. What is the most likely diagnosis?

A. Labyrinthitis (Correct Answer)
B. Thrombophlebitis
C. Temporal lobe abscess
D. Mastoiditis

Explanation: **Explanation:** The clinical presentation of **vertigo** and **deafness** following mastoid surgery in a patient with chronic ear discharge is a classic indicator of **Labyrinthitis**. **1. Why Labyrinthitis is correct:** The inner ear (labyrinth) is in close anatomical proximity to the middle ear and mastoid. During surgery for chronic otitis media (especially if a cholesteatoma is present), the protective bony covering of the labyrinth (most commonly the lateral semicircular canal) may be breached or eroded. This allows inflammatory mediators or infection to enter the inner ear, leading to **suppurative labyrinthitis**. This results in the "dead ear" phenomenon—characterized by a combination of **vestibular symptoms (vertigo)** and **cochlear symptoms (sensorineural hearing loss/deafness)**. **2. Why other options are incorrect:** * **Thrombophlebitis (Sigmoid Sinus):** Presents with "picket-fence" fever, headache, and signs of increased intracranial pressure, but not typically sudden deafness. * **Temporal Lobe Abscess:** An intracranial complication presenting with headache, vomiting, seizures, and focal neurological deficits (like nominal aphasia), rather than primary inner ear symptoms. * **Mastoiditis:** This is an infection of the mastoid air cells themselves. While it is the reason for the surgery, it does not explain the acute onset of postoperative vertigo and deafness unless it progresses to labyrinthitis. **NEET-PG High-Yield Pearls:** * **Most common site of fistula:** Lateral Semicircular Canal (LSCC). * **Fistula Test:** Positive when pressure changes in the canal induce vertigo/nystagmus; it becomes negative once the ear is "dead" (Labyrinthitis). * **Management:** Labyrinthitis is a surgical emergency if caused by acute infection; it requires high-dose antibiotics and sometimes surgical drainage.

Question 127: What is another name for adenoids?

A. Nasopharyngeal tonsils (Correct Answer)
B. Palatine tonsils
C. Faucial tonsils
D. Lingual tonsils

Explanation: **Explanation:** The **adenoids**, also known as the **nasopharyngeal tonsils**, are a subepithelial collection of lymphoid tissue located at the junction of the roof and posterior wall of the nasopharynx. They form the superior-most component of **Waldeyer’s ring**, a protective ring of lymphoid tissue at the entrance of the aerodigestive tract. Unlike palatine tonsils, adenoids are covered by ciliated pseudostratified columnar (respiratory) epithelium and do not possess crypts. **Analysis of Options:** * **A. Nasopharyngeal tonsils (Correct):** This is the anatomical synonym for adenoids. They are most prominent in children (ages 3–7) and typically undergo physiological atrophy after puberty. * **B. Palatine tonsils:** These are the "true" tonsils located in the oropharynx between the palatoglossal and palatopharyngeal arches. * **C. Faucial tonsils:** This is simply another name for the palatine tonsils (located in the "fauces"). * **D. Lingual tonsils:** These are located on the posterior one-third of the tongue. **High-Yield Clinical Pearls for NEET-PG:** * **Passavant’s Ridge:** Formed by the contraction of the palatopharyngeus muscle; it helps in velopharyngeal closure against the adenoid tissue. * **Adenoid Facies:** A characteristic facial appearance (long face, open mouth, crowded teeth, high-arched palate) resulting from chronic mouth breathing due to adenoid hypertrophy. * **Eustachian Tube Dysfunction:** Enlarged adenoids can block the torus tubarius, leading to **Otitis Media with Effusion (Glue Ear)**. * **Investigation of Choice:** X-ray soft tissue nasopharynx (lateral view) shows a soft tissue mass narrowing the nasopharyngeal airway.

Question 128: Otoacoustic emissions are derived from:

A. Tympanic membrane
B. Ossicles
C. Cochlea (Correct Answer)
D. Vestibule

Explanation: ### Explanation **Correct Answer: C. Cochlea** Otoacoustic emissions (OAEs) are low-intensity sounds generated within the **Cochlea**, specifically by the **Outer Hair Cells (OHCs)**. These cells possess electromotility—the ability to change length in response to electrical stimulation. This movement acts as a "cochlear amplifier," enhancing the sensitivity and frequency selectivity of hearing. The energy produced by this process travels backward through the middle ear and vibrates the tympanic membrane, where it can be recorded by a sensitive microphone in the ear canal. **Why other options are incorrect:** * **A. Tympanic membrane:** While the tympanic membrane vibrates to transmit the OAE into the ear canal, it is not the *source* of the sound. * **B. Ossicles:** The ossicular chain acts as a passive mechanical conduit for sound; it does not generate the active energy required for OAEs. * **D. Vestibule:** The vestibule is part of the inner ear responsible for balance (equilibrium), not auditory processing or sound generation. **High-Yield Clinical Pearls for NEET-PG:** * **Source:** Specifically the **Outer Hair Cells** (not Inner Hair Cells). * **Clinical Use:** OAEs are the gold standard for **Universal Newborn Hearing Screening (UNHS)** because they are non-invasive, objective, and quick. * **Prerequisite:** To record OAEs, the patient must have a **normal middle ear function**. If there is fluid (Otitis Media) or a perforation, OAEs will be absent even if the cochlea is healthy. * **Hearing Loss:** OAEs are typically absent when hearing loss exceeds **30–35 dB**. * **Distinction:** OAEs are present in **Auditory Neuropathy Spectrum Disorder (ANSD)**, but the BERA (Brainstem Evoked Response Audiometry) will be abnormal. This is a classic "catch" in exam questions.

Question 129: Cart Wheel sign is seen in which condition?

A. Acute Suppurative Otitis Media (ASOM) (Correct Answer)
B. Glomus tumor
C. Otitis Media with Effusion (OME)
D. Chronic Suppurative Otitis Media (CSOM)

Explanation: ### Explanation **Correct Answer: A. Acute Suppurative Otitis Media (ASOM)** The **Cart Wheel sign** (also known as the "Spoke-like appearance") is a classic otoscopic finding seen during the **Stage of Hyperemia** in Acute Suppurative Otitis Media. **Pathophysiology:** During the early stages of ASOM, the inflammatory process causes intense congestion of the blood vessels. These vessels radiate from the periphery of the tympanic membrane toward the handle of the malleus. On examination, this radial pattern of dilated capillaries resembles the spokes of a cartwheel. As the infection progresses to the stage of exudation, the tympanic membrane becomes uniformly red and bulging, and this sign disappears. **Analysis of Incorrect Options:** * **B. Glomus Tumor:** This condition is characterized by a **Rising Sun appearance** (a red/blue mass behind an intact tympanic membrane) and a positive **Brown’s sign** (pulsation of the mass that ceases with pneumatic otoscopy). * **C. Otitis Media with Effusion (OME):** This presents with a dull, retracted tympanic membrane, often showing **air-fluid levels** or **air bubbles**. The membrane may appear amber or yellowish, but not hyperemic with radial vessels. * **D. Chronic Suppurative Otitis Media (CSOM):** This is characterized by a permanent perforation of the tympanic membrane. In the mucosal type, one might see a "central perforation," but not the acute vascular congestion seen in ASOM. **High-Yield Clinical Pearls for NEET-PG:** * **Light House Sign:** Seen in the Stage of Suppuration of ASOM (pulsatile discharge through a small perforation). * **Flamingo Pink Flush (Schwartz Sign):** Seen in Otosclerosis (indicates active focus on the promontory). * **Blue Drum:** Seen in Hemotympanum or sometimes in Glomus tumors. * **Chalky White Patch:** Seen in Tympanosclerosis (hyalinized collagen in the fibrous layer).

Question 130: A triad of tinnitus, progressive deafness, vertigo, along with facial weakness is seen in which of the following conditions?

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

Explanation: **Explanation:** The clinical presentation described—**tinnitus, progressive sensorineural hearing loss (SNHL), and vertigo**—constitutes the classic triad of inner ear dysfunction. However, the addition of **facial weakness** (VII nerve involvement) is the critical localizing sign that points toward a lesion in the **Internal Auditory Canal (IAC) or Cerebellopontine Angle (CPA)**, rather than the inner ear alone. **1. Why Acoustic Neuroma (Vestibular Schwannoma) is correct:** Acoustic neuroma is a benign tumor arising from the Schwann cells of the vestibular nerve. As the tumor grows within the narrow IAC, it compresses the adjacent **Cochlear nerve** (leading to progressive SNHL and tinnitus) and the **Vestibular nerve** (leading to dysequilibrium/vertigo). Because the **Facial nerve (VII)** runs in close proximity within the same bony canal, large or expanding tumors eventually compress it, resulting in facial weakness or palsy. **2. Why other options are incorrect:** * **Meniere’s Disease:** Characterized by the same triad (vertigo, tinnitus, SNHL), but it is a peripheral endolymphatic hydrops. It **never** involves the facial nerve. * **Lermoyez Syndrome:** A rare variant of Meniere’s where hearing improves during a vertigo attack ("the phenomenon of hearing better when dizzy"). It also does not involve the facial nerve. * **Otosclerosis:** Typically presents with **conductive hearing loss** (not SNHL) and a normal facial nerve. Vertigo is rare (except in late-stage cochlear otosclerosis). **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Sign of Acoustic Neuroma:** Loss of corneal reflex (Trigeminal nerve/V5 involvement). * **Hitselberger’s Sign:** Hypesthesia of the posterior meatal wall due to compression of facial nerve sensory fibers. * **Investigation of Choice:** Gadolinium-enhanced MRI (Gold Standard). * **Bilateral Acoustic Neuromas:** Pathognomonic for **Neurofibromatosis Type 2 (NF2)**.

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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