Neurotology Practice Questions

Q: Which of the following is associated with objective tinnitus?

Glomus tumor. **Explanation:** Tinnitus is classified into two types: **Subjective** (heard only by the patient) and **Objective** (audible to both the patient and the examiner). **Why Glomus Tumor is Correct:** Glomus tumors (Glomus Jugulare or Glomus Tympanicum) are highly vascular, benign neoplasms arising from paraganglia. Because of their extreme vascularity, they produce a **pulsatile, objective tinnitus** that synchronizes with the patient’s heartbeat. An examiner can often hear this sound using a stethoscope placed over the mastoid or by using a Toynbee tube. This is a classic "vascular" cause of tinnitus. **Why the Other Options are Incorrect:** * **Meniere’s Disease:** Characterized by low-pitched, roaring **subjective** tinnitus. It is caused by endolymphatic hydrops, not a vascular or mechanical sound source. * **Acoustic Neuroma:** Typically presents with high-pitched, continuous **subjective** tinnitus due to compression of the cochlear nerve. * **Ear Wax (Impacted Cerumen):** Causes **subjective** tinnitus due to conductive hearing loss and the "occlusion effect," where internal body sounds are amplified to the patient, but no external sound is generated for an observer to hear. **High-Yield Clinical Pearls for NEET-PG:** * **Pulsatile Tinnitus:** Always think of vascular etiologies like Glomus tumors, carotid artery stenosis, or arteriovenous malformations (AVMs). * **Brown’s Sign:** Pulsation of the tympanic membrane seen on otoscopy in Glomus tumors; it blanches with positive pressure (Siegle’s speculum). * **Aquino’s Sign:** Pulsations in a Glomus tumor decrease or stop with carotid artery compression. * **Palatal Myoclonus:** A rare cause of objective tinnitus characterized by a "clicking" sound due to rhythmic contraction of the tensor veli palatini muscle.

Q: Which of the following is NOT caused by an acoustic neuroma?

Ptosis. **Explanation:** Acoustic Neuroma (Vestibular Schwannoma) is a benign tumor arising from the Schwann cells of the **vestibular nerve** (CN VIII), typically within the internal auditory canal or the cerebellopontine (CP) angle. **Why Ptosis is the Correct Answer:** Ptosis (drooping of the upper eyelid) is caused by a lesion of the **Oculomotor nerve (CN III)** or sympathetic nerve fibers (Horner’s syndrome). The Oculomotor nerve is located in the midbrain and cavernous sinus, far superior to the CP angle. Acoustic neuromas do not typically involve CN III; therefore, ptosis is not a clinical feature of this tumor. **Analysis of Other Options:** * **Unilateral Deafness:** This is the most common presenting symptom. The tumor compresses the cochlear division of **CN VIII**, leading to progressive sensorineural hearing loss. * **Nystagmus:** As the tumor originates from the vestibular nerve, it disrupts vestibular input, leading to vertigo and vestibular nystagmus (typically horizontal-torsional). * **Loss of Corneal Reflex:** This is the **earliest sign** of trigeminal nerve (**CN V**) involvement. As the tumor expands in the CP angle, it compresses the trigeminal nerve, leading to diminished corneal sensitivity before overt facial numbness occurs. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Symptom:** Progressive unilateral sensorineural hearing loss and tinnitus. * **Earliest Sign:** Loss of corneal reflex (CN V involvement). * **Facial Nerve (CN VII):** Surprisingly resistant to pressure; facial weakness is usually a late feature despite the nerve's proximity. * **Gold Standard Investigation:** Gadolinium-enhanced MRI of the Internal Auditory Canal. * **Bilateral Acoustic Neuromas:** Pathognomonic for **Neurofibromatosis Type 2 (NF2)**.

Q: A 63-year-old woman presents with a 5-year history of gradual hearing loss and recent intermittent tinnitus. Physical and neurologic examinations are normal except for sensorineural hearing loss in the left ear and no cranial nerve deficits. An MRI of the brain with gadolinium reveals an extra-axial tumor in the left cerebellopontine angle. What is the most likely diagnosis?

Acoustic neuroma. **Explanation:** The clinical presentation of a middle-aged patient with **unilateral progressive sensorineural hearing loss (SNHL)** and tinnitus is a classic "red flag" for an **Acoustic Neuroma** (Vestibular Schwannoma). **1. Why Acoustic Neuroma is correct:** Acoustic neuroma is a benign, slow-growing tumor arising from the Schwann cells of the vestibular nerve (CN VIII). It is the **most common tumor of the cerebellopontine (CP) angle**, accounting for approximately 80-90% of cases. The tumor compresses the cochlear nerve, leading to gradual SNHL and tinnitus. MRI with gadolinium is the gold standard for diagnosis, typically showing an enhancing mass within the internal auditory canal (IAC) or CP angle. **2. Why other options are incorrect:** * **Meningioma:** The second most common CP angle tumor. While it can present similarly, it usually has a broader base along the petrous bone and often shows a "dural tail" on MRI, which is not mentioned here. * **Epidermoid Tumor:** These are congenital lesions that appear "pearly white" and are non-enhancing on MRI (unlike this case, which shows gadolinium enhancement). They typically present with cranial nerve palsies earlier than hearing loss. * **Glioblastoma Multiforme:** This is a highly malignant primary brain tumor (intra-axial) usually found in the cerebral hemispheres, not an extra-axial tumor in the CP angle. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest symptom:** Progressive unilateral SNHL (high frequencies affected first). * **Earliest sign:** Loss of corneal reflex (due to CN V involvement). * **Gold Standard Investigation:** MRI with Gadolinium (shows "ice-cream cone" appearance). * **Bilateral Acoustic Neuromas:** Pathognomonic for **Neurofibromatosis Type 2 (NF2)**. * **Audiometry:** Shows "Retrocochlear" pathology (Poor speech discrimination scores out of proportion to pure tone loss and significant "Roll-over" phenomenon).

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

Low frequency sensorineural hearing loss. **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).

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

Otorrhoea. **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.

Q: Crocodile tears are seen in which of the following conditions?

Abnormal facial nerve regeneration. **Explanation:** **Crocodile Tears Syndrome** (also known as Bogorad’s syndrome or Gustatolacrimal reflex) is a rare complication following **Facial Nerve (CN VII)** palsy, typically Bell’s palsy. **Why the correct answer is right:** The underlying mechanism is **abnormal/misdirected neuronal regeneration**. During recovery from a facial nerve injury proximal to the geniculate ganglion, the efferent parasympathetic fibers originally destined for the **submandibular and sublingual salivary glands** (via the chorda tympani) are misdirected. They mistakenly grow along the path of the **greater petrosal nerve**, which supplies the **lacrimal gland**. Consequently, a gustatory stimulus (smelling or tasting food) that should normally cause salivation instead triggers inappropriate tearing. **Why the incorrect options are wrong:** * **Frey’s Syndrome:** This involves misdirection of the **auriculotemporal nerve** (branch of CN V3) following parotid surgery. It results in "gustatory sweating" (sweating and flushing while eating) rather than tearing. * **Conjunctivitis & Ophthalmia Neonatorum:** These are inflammatory/infectious conditions of the conjunctiva. While they cause lacrimation (reflex tearing due to irritation), they do not involve the neurological misdirection characteristic of crocodile tears. **High-Yield Clinical Pearls for NEET-PG:** * **Site of Lesion:** The injury must occur at or proximal to the **Geniculate Ganglion**. * **Treatment:** The drug of choice for symptomatic relief is **Botulinum toxin (Botox)** injection into the lacrimal gland. * **Inverse Marcus Gunn Phenomenon:** Do not confuse this with Crocodile tears; it refers to ptosis that worsens with jaw movement.

Q: Micro-Wick and Mierocatheter sustained release devices are used for which of the following?

Delivering drugs to the round window membrane. The correct answer is **D. Delivering drugs to the round window membrane.** ### **Explanation** The **Micro-Wick** and **Microcatheter** are specialized drug delivery systems designed for **Intratympanic (IT) therapy**. The underlying medical concept is the delivery of high concentrations of medication (typically corticosteroids or Gentamicin) directly to the inner ear fluids via diffusion through the **round window membrane (RWM)**. * **Micro-Wick:** A small, polyvinyl acetate sponge inserted through a myringotomy incision. It rests against the RWM, and the patient self-administers ear drops that travel down the wick to provide a sustained release of medication. * **Microcatheter:** A tiny catheter (like the Round Window μCath) placed in the middle ear to provide continuous infusion of drugs to the RWM. These devices are primarily used to treat **Meniere’s disease** (intratympanic Gentamicin or Dexamethasone) and **Sudden Sensorineural Hearing Loss (SSNHL)**. ### **Why other options are incorrect:** * **A & B (Drooling and Frey’s Syndrome):** These involve salivary gland pathology. Drooling is managed with anticholinergics or Botox injections into the salivary glands. Frey’s syndrome (gustatory sweating) is managed with Botox or surgical barriers like the SMAS flap. * **C (Epistaxis):** Control of epistaxis involves nasal packing, cautery (chemical or electrical), or arterial ligation/embolization. ### **High-Yield Clinical Pearls for NEET-PG:** * **Round Window Membrane:** The primary portal for non-invasive entry into the inner ear. * **Intratympanic Gentamicin:** Used for "chemical labyrinthectomy" in intractable Meniere’s to control vertigo while attempting to preserve hearing. * **Advantage:** These devices bypass the **blood-labyrinth barrier**, achieving higher perilymph concentrations than systemic administration with fewer side effects.

Q: What is the earliest symptom of an acoustic nerve tumor?

Sensorineural hearing loss. ### Explanation **Acoustic Neuroma (Vestibular Schwannoma)** is a benign tumor arising from the Schwann cells of the vestibular nerve (most commonly the inferior vestibular nerve). Despite its origin on the vestibular nerve, the clinical presentation is dominated by auditory symptoms due to the compression of the adjacent cochlear nerve within the narrow internal auditory canal. **1. Why Sensorineural Hearing Loss (SNHL) is the correct answer:** The **earliest and most common symptom** (seen in >95% of cases) is progressive, unilateral, high-frequency sensorineural hearing loss. Because the tumor grows slowly, the brain often compensates for vestibular changes, making auditory deficits more noticeable to the patient than balance issues. **2. Why the other options are incorrect:** * **B. Tinnitus:** This is the second most common symptom. While it often accompanies hearing loss, it usually follows the onset of SNHL or is noticed concurrently. * **C. Vertigo:** True rotatory vertigo is rare because the slow growth of the tumor allows for **vestibular compensation** by the contralateral ear and the cerebellum. Patients more commonly report vague "unsteadiness" or "disequilibrium." * **D. Otorrhea:** This refers to ear discharge, which is a feature of middle or external ear pathology (like chronic otitis media). Acoustic neuroma is a retrocochlear lesion and does not cause discharge. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Gadolinium-enhanced MRI of the Internal Auditory Canal (IAC). * **Audiometry Finding:** Characterized by **"Roll-over phenomenon"** (speech discrimination score decreases as intensity increases) and poor speech discrimination out of proportion to pure tone loss. * **Earliest Sign:** Loss of corneal reflex (due to pressure on the Trigeminal nerve/CN V as the tumor expands into the CPA). * **Bilateral Acoustic Neuromas:** Highly suggestive of **Neurofibromatosis Type 2 (NF2)**.

Question 1

Which of the following is associated with objective tinnitus?

Accepted Answer

Glomus tumor

Answer

Meniere's disease

Answer

Acoustic neuroma

Answer

Ear wax

Question 2

Which of the following is NOT caused by an acoustic neuroma?

Accepted Answer

Ptosis

Answer

Nystagmus

Answer

Unilateral deafness

Answer

Loss of corneal reflex

Question 3

A 63-year-old woman presents with a 5-year history of gradual hearing loss and recent intermittent tinnitus. Physical and neurologic examinations are normal except for sensorineural hearing loss in the left ear and no cranial nerve deficits. An MRI of the brain with gadolinium reveals an extra-axial tumor in the left cerebellopontine angle. What is the most likely diagnosis?

Accepted Answer

Acoustic neuroma

Answer

Epidermoid tumor (cholesteatoma)

Answer

Glioblastoma multiforme

Answer

Meningioma

Question 4

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

Accepted Answer

Low frequency sensorineural hearing loss

Answer

Low frequency conductive hearing loss

Answer

High frequency conductive hearing loss

Answer

High frequency sensorineural hearing loss

Question 5

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

Accepted Answer

Otorrhoea

Answer

Tinnitus

Answer

Deafness

Answer

Vertigo

Question 6

Crocodile tears are seen in which of the following conditions?

Accepted Answer

Abnormal facial nerve regeneration

Answer

Frey's syndrome

Answer

Conjunctivitis

Answer

Ophthalmia neonatorum

Question 7

Micro-Wick and Mierocatheter sustained release devices are used for which of the following?

Accepted Answer

Delivering drugs to the round window membrane

Answer

Drooling of saliva

Answer

Frey's syndrome

Answer

Control of epistaxis

Question 8

A 30-year-old male presents with attic cholesteatoma of the left ear complicated by lateral sinus thrombophlebitis. Which of the following surgical approaches is the operation of choice?

Accepted Answer

Canal wall down mastoidectomy

Answer

Intact canal wall mastoidectomy

Answer

Mastoidectomy with cavity obliteration

Answer

Simple mastoidectomy with tympanoplasty

Question 9

What is the earliest symptom of an acoustic nerve tumor?

Accepted Answer

Sensorineural hearing loss

Answer

Tinnitus

Answer

Vertigo

Answer

Otorrhea

Question 10

Cerebrospinal fluid (CSF) is physiologically similar to which fluid?

Accepted Answer

Perilymph

Answer

Endolymph

Answer

Coilymph

Answer

Urine

Neurotology — MCQs

Neurotology — MCQs

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