Neurotology — MCQs
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The Rinne test is positive in which of the following conditions?
A 31-year-old female patient complains of bilateral impairment of hearing for the past 5 years. On examination, tympanic membrane is normal, and audiogram shows a bilateral conductive loss. Impedance audiometry shows an AS type of curve and an absent acoustic reflex. All constitute part of the treatment except?
The facial recess is bounded by which of the following structures?
What is the treatment for serous otitis media?
Frey's syndrome is caused by?
What forms the lateral wall of the mastoid antrum?
What does the singular nerve supply?
Paracusis Willisii is seen in which of the following conditions?
Areas of spontaneous healed perforation of the tympanic membrane are called as?
Which of the following is associated with objective tinnitus?
Neurotology Indian Medical PG Practice Questions and MCQs
Question 211: The Rinne test is positive in which of the following conditions?
- A. Chronic suppurative otitis media
- B. Normal individual (Correct Answer)
- C. Otomycosis
- D. Wax in ear
Explanation: **Explanation:** The **Rinne test** is a tuning fork test (using 512 Hz) that compares Air Conduction (AC) with Bone Conduction (BC). 1. **Why the Correct Answer is Right:** In a **Normal individual**, Air Conduction is more efficient than Bone Conduction (**AC > BC**). This is termed a **"Rinne Positive"** result. Sound travels more effectively through the middle ear apparatus (ossicles) than through the skull bones. A positive Rinne test is also seen in patients with **Sensorineural Hearing Loss (SNHL)**, because while both AC and BC are reduced, the relative efficiency of the middle ear remains intact (AC > BC). 2. **Why the Incorrect Options are Wrong:** * **Chronic Suppurative Otitis Media (CSOM):** This causes a perforation in the tympanic membrane and/or ossicular damage, leading to **Conductive Hearing Loss (CHL)**. In CHL, BC > AC, resulting in a **Rinne Negative** test. * **Otomycosis & Wax in ear:** These are conditions of the external auditory canal that cause a physical blockage. This prevents sound waves from reaching the middle ear effectively, causing **CHL** and a **Rinne Negative** result. **Clinical Pearls for NEET-PG:** * **False Negative Rinne:** Seen in **Unilateral Severe/Profound SNHL**. The patient perceives sound when the fork is on the mastoid because the sound travels via bone to the *opposite* (better) ear. * **Negative Rinne:** Indicates a conductive gap of at least **15–20 dB**. * **High-Yield Sequence:** For a complete bedside assessment, always combine Rinne with the **Weber test** (lateralizes to the poorer ear in CHL and the better ear in SNHL).
Question 212: A 31-year-old female patient complains of bilateral impairment of hearing for the past 5 years. On examination, tympanic membrane is normal, and audiogram shows a bilateral conductive loss. Impedance audiometry shows an AS type of curve and an absent acoustic reflex. All constitute part of the treatment except?
- A. Hearing aid
- B. Stapedectomy
- C. Sodium fluoride
- D. Gentamicin therapy (Correct Answer)
Explanation: ### Explanation The clinical presentation describes a classic case of **Otosclerosis**. The patient is a young female with bilateral progressive conductive hearing loss, a normal tympanic membrane, and specific impedance findings: an **$A_S$ type curve** (indicating stiffness of the ossicular chain) and an **absent acoustic reflex** (due to stapes fixation). #### Why Gentamicin therapy is the correct answer: **Gentamicin** is an aminoglycoside antibiotic with significant vestibulotoxicity. In ENT, it is used for **chemical labyrinthectomy** to treat intractable **Meniere’s disease** by destroying vestibular hair cells. It has no role in the management of Otosclerosis and would likely cause sensorineural hearing loss or vestibular dysfunction. #### Why the other options are incorrect: * **Hearing Aid:** This is the safest non-surgical management for Otosclerosis. It is preferred for patients who are unfit for surgery or do not wish to undergo an operation. * **Stapedectomy:** This is the **surgical treatment of choice**. The fixed stapes footplate is replaced with a prosthesis (e.g., Teflon piston) to restore the ossicular chain's mobility. * **Sodium Fluoride:** This is the **medical treatment** for active Otosclerosis (Otospongiosis). It inhibits osteoclastic activity and promotes calcification of the spongy bone, potentially arresting the progression of the disease and stabilizing sensorineural loss. #### Clinical Pearls for NEET-PG: * **Schwartze Sign (Flamingo Flush):** A reddish hue seen through the TM due to increased vascularity of the promontory in active otospongiosis. * **Carhart’s Notch:** A characteristic dip in the bone conduction threshold at **2000 Hz** on an audiogram. * **Gelle’s Test:** Negative in Otosclerosis (indicates a fixed ossicular chain). * **Bezold’s Triad:** Includes (1) Negative Rinne test, (2) Raised lower limit of hearing (loss of low frequencies), and (3) Retarded bone conduction (prolonged Schwabach test).
Question 213: The facial recess is bounded by which of the following structures?
- A. Medially by the vertical part of the VII nerve
- B. Laterally by the chorda tympani
- C. Above by the fossa incudis
- D. All of the above (Correct Answer)
Explanation: The **Facial Recess** (also known as the posterior sinus) is a critical anatomical landmark in ear surgery, particularly for performing a posterior tympanotomy. It is a triangular depression on the posterior wall of the middle ear. ### **Anatomical Boundaries** The boundaries of the facial recess form a triangle, often referred to as the **Surgical Triangle**: * **Medially:** The vertical (mastoid) segment of the **Facial Nerve (VII)**. * **Laterally:** The **Chorda Tympani** nerve (which branches off the facial nerve). * **Superiorly (Base):** The **Fossa Incudis** (which houses the short process of the incus). Since all three anatomical descriptions provided in the options accurately define the boundaries of this space, **Option D (All of the above)** is the correct answer. ### **Clinical Significance & High-Yield Facts** * **Posterior Tympanotomy:** This is the surgical procedure of opening the facial recess to gain access to the middle ear from the mastoid cavity without disturbing the tympanic membrane. * **Indications:** It is a mandatory step in **Cochlear Implant surgery** (to reach the round window) and in some cases of chronic suppurative otitis media (CSOM) to clear disease from the facial recess or sinus tympani. * **Sinus Tympani vs. Facial Recess:** Do not confuse the two. The **Sinus Tympani** lies **medial** to the facial nerve, while the **Facial Recess** lies **lateral** to it. The sinus tympani is often considered the "hidden area" of the middle ear and is a common site for residual cholesteatoma.
Question 214: What is the treatment for serous otitis media?
- A. Observation
- B. Adenoidectomy
- C. Grommet insertion
- D. All of the above (Correct Answer)
Explanation: **Explanation:** Serous Otitis Media (SOM), also known as **Otitis Media with Effusion (OME)**, is characterized by the presence of non-purulent fluid in the middle ear cleft. The primary pathophysiology involves **Eustachian tube dysfunction**, often secondary to adenoid hypertrophy, allergies, or resolving acute otitis media. The management of SOM follows a stepwise approach, making "All of the above" the correct answer: 1. **Observation (Option A):** Most cases of OME are self-limiting. A period of **watchful waiting (usually 3 months)** is the first line of management, as spontaneous resolution occurs in a high percentage of children. 2. **Adenoidectomy (Option B):** If the effusion is persistent and associated with adenoid hypertrophy, an adenoidectomy is performed. This removes the mechanical obstruction of the Eustachian tube orifice and eliminates a reservoir for infection. 3. **Grommet Insertion (Option C):** Also known as a myringotomy with ventilation tube insertion. This is indicated if the effusion persists beyond 3 months, causes significant hearing loss (>20-25 dB), or results in structural changes to the tympanic membrane. The grommet bypasses the dysfunctional Eustachian tube to ventilate the middle ear. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Impedance Audiometry (Tympanometry) showing a **Type B curve** (flat curve). * **Hearing Loss:** Typically a **Conductive Hearing Loss** of 20–40 dB. * **Otoscopy Finding:** Dull, retracted tympanic membrane with restricted mobility; presence of **air bubbles** or an air-fluid level. * **Most Common Site for Grommet:** Antero-inferior quadrant of the tympanic membrane (to avoid injury to the ossicles and chorda tympani). * **Adult Presentation:** Unilateral SOM in an adult is **Nasopharyngeal Carcinoma** until proven otherwise; always examine the fossa of Rosenmüller.
Question 215: Frey's syndrome is caused by?
- A. Post-traumatic aberrant regeneration of facial nerve fibers with parasympathetic innervation from the auriculotemporal nerve. (Correct Answer)
- B. Lesions involving the greater auricular nerve and the auriculotemporal nerve.
- C. Damage to the facial nerve in conjunction with the greater auricular nerve.
- D. None of the above.
Explanation: ### Explanation **Frey’s Syndrome (Gustatory Sweating)** occurs most commonly as a complication of parotid surgery (e.g., parotidectomy) or trauma to the parotid region. **1. Why Option A is Correct:** The underlying mechanism is **aberrant regeneration**. Normally, the **auriculotemporal nerve** (a branch of the mandibular nerve) carries postganglionic parasympathetic fibers from the otic ganglion to the parotid gland to stimulate salivation. Following injury, these regenerating parasympathetic fibers misdirect themselves to the overlying skin, where they innervate **sweat glands** and **subcutaneous blood vessels** (which are normally supplied by sympathetic fibers). Consequently, a stimulus for salivation (eating) results in localized sweating and flushing of the preauricular skin. **2. Why Other Options are Incorrect:** * **Option B & C:** While the **greater auricular nerve** (C2, C3) provides sensory innervation to the skin over the parotid and lower ear, it is not the primary driver of the secretomotor reflex involved in Frey’s syndrome. The syndrome is specifically a "cross-talk" between the parasympathetic system (auriculotemporal nerve) and the sympathetic system (sweat glands), not a simple sensory nerve lesion. **3. High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Confirmed by the **Minor’s Starch-Iodine Test**. Iodine is applied to the skin and allowed to dry; starch is then dusted over it. Upon eating, sweating turns the starch-iodine mixture **dark blue/black**. * **Treatment:** Conservative management is preferred. Medical options include topical **anticholinergics** (Glycopyrrolate) or **Botulinum toxin** injections. Surgical options include interposing a barrier (e.g., SMAS flap or fascia lata) between the nerve and skin. * **Nerve involved:** Auriculotemporal nerve (Branch of V3). * **Ganglion involved:** Otic ganglion.
Question 216: What forms the lateral wall of the mastoid antrum?
- A. Squamous temporal bone (Correct Answer)
- B. Tegmen antri
- C. Sigmoid sinus
- D. None of the above
Explanation: The **mastoid antrum** is a large, air-filled cavity within the petrous part of the temporal bone that communicates with the middle ear via the aditus ad antrum. Understanding its boundaries is high-yield for surgical procedures like cortical mastoidectomy. ### 1. Why Option A is Correct The **lateral wall** of the mastoid antrum is formed by the **squamous part of the temporal bone**. In adults, this wall is approximately 12–15 mm thick. Its surface landmark is the **Macewen’s triangle** (suprameatal triangle), which serves as the surgical gateway to the antrum. In infants, this wall is very thin (only about 2 mm), making the antrum more superficial and the facial nerve more vulnerable during surgery. ### 2. Why Other Options are Incorrect * **Option B (Tegmen antri):** This forms the **roof** (superior wall) of the mastoid antrum, separating it from the middle cranial fossa and the temporal lobe of the brain. * **Option C (Sigmoid sinus):** This is related to the **posterior wall** (specifically the posterior part of the medial wall/base). It is a vital structure to avoid during mastoid surgery. ### Clinical Pearls for NEET-PG * **Macewen’s Triangle Boundaries:** Superiorly by the supramastoid crest, anteriorly by the posterosuperior margin of the external auditory canal, and posteriorly by a tangent drawn to the meatus. * **Korner’s Septum:** A persistent petrosquamosal suture that can appear as a "false medial wall" during surgery, potentially leading the surgeon to believe they have reached the antrum when they are still superficial. * **Medial Wall Landmark:** The medial wall of the antrum is related to the **lateral semicircular canal**, which is a crucial landmark during mastoid surgery to avoid labyrinthine injury.
Question 217: What does the singular nerve supply?
- A. Superior vestibular nerve supplying the posterior semicircular canal
- B. Inferior vestibular nerve supplying the posterior semicircular canal (Correct Answer)
- C. Superior vestibular nerve supplying the anterior semicircular canal
- D. Inferior vestibular nerve supplying the anterior semicircular canal
Explanation: ### Explanation The **singular nerve** (also known as the posterior ampullary nerve) is a specific branch of the **inferior vestibular nerve**. Its primary function is to provide sensory innervation to the ampulla of the **posterior semicircular canal (PSC)**. #### Why the Correct Answer is Right: The vestibular nerve divides within the internal auditory canal into superior and inferior divisions. The **inferior vestibular nerve** further branches into the saccular nerve and the singular nerve. The singular nerve travels through a dedicated bony canal (the Foramen Singulare) to reach the posterior canal. This anatomical specificity is crucial during surgical procedures like singular neurectomy, used to treat intractable Benign Paroxysmal Positional Vertigo (BPPV). #### Why Other Options are Wrong: * **Options A & C:** The **superior vestibular nerve** supplies the **utricle**, the **anterior (superior) semicircular canal**, and the **lateral (horizontal) semicircular canal**. It does not supply the posterior canal. * **Option D:** While the inferior vestibular nerve does supply the saccule, it does not supply the anterior semicircular canal; that is the domain of the superior division. #### High-Yield Clinical Pearls for NEET-PG: * **Innervation Mnemonic:** * **Superior Division:** **A**nterior canal, **L**ateral canal, **U**tricle (**ALU**). * **Inferior Division:** **S**accule and **P**osterior canal (**S**ingular nerve) (**SP**). * **Mike’s Canal:** The anatomical landmark for the singular nerve is the **Foramen Singulare**, located in the posterior wall of the internal acoustic meatus. * **Clinical Correlation:** In **Vestibular Neuritis**, if only the superior division is affected, the posterior canal function (tested by Head Shake/DVA) remains intact because it is spared by the inferior division.
Question 218: Paracusis Willisii is seen in which of the following conditions?
- A. Otosclerosis (Correct Answer)
- B. Meniere's disease
- C. Glomus tumor
- D. Tubercular otitis media
Explanation: **Explanation:** **Paracusis Willisii** is a clinical phenomenon where a patient with hearing loss paradoxically hears better in a noisy environment (e.g., in a moving train or a crowded market). **1. Why Otosclerosis is the correct answer:** In **Otosclerosis**, the patient suffers from conductive hearing loss (CHL). In a noisy environment, normal-hearing people naturally raise their voice volume to overcome background noise (the Lombard effect). Because the CHL in Otosclerosis acts as a "filter" that masks out the low-frequency background noise, the patient can hear the elevated speech of others much more clearly than they would in a quiet room. This is a classic hallmark of stapedial otosclerosis. **2. Why the other options are incorrect:** * **Meniere’s Disease:** This is a sensory-neural hearing loss (SNHL) condition. Patients often experience recruitment (abnormal loudness growth) and intolerance to loud noises, making noisy environments difficult. * **Glomus Tumor:** This typically presents with pulsatile tinnitus and conductive hearing loss, but Paracusis Willisii is not a characteristic feature. * **Tubercular Otitis Media:** This presents with painless ear discharge, multiple perforations, and profound hearing loss, but does not specifically exhibit this phenomenon. **High-Yield Clinical Pearls for NEET-PG:** * **Schwartze Sign (Flamingo Flush):** Reddish hue on the promontory seen in active otosclerosis (Otospongiosis). * **Carhart’s Notch:** A characteristic dip in the bone conduction curve at **2000 Hz** seen in Otosclerosis. * **Gelle’s Test:** Negative in Otosclerosis (indicates a fixed ossicular chain). * **Treatment of Choice:** Stapedotomy (using a Teflon piston). * **Medical Treatment:** Sodium Fluoride (inhibits osteoclastic activity).
Question 219: Areas of spontaneous healed perforation of the tympanic membrane are called as?
- A. Perforations (Correct Answer)
- B. Atelectasis
- C. Both of the above
- D. None of the above
Explanation: **Explanation:** The correct answer is **Perforations** (specifically referred to as **monomeric membranes** or "false membranes"). **1. Why "Perforations" is correct:** When a tympanic membrane (TM) perforation heals spontaneously, it often lacks the middle fibrous layer (*lamina propria*), which is responsible for the drum's stiffness and resilience. The healed area consists only of the outer epithelial layer and the inner mucosal layer. Because this area is thin, transparent, and lacks structural support, it is clinically termed a **monomeric membrane**. To an untrained eye or under certain lighting, these areas look like persistent holes because they are so thin, but they are technically "healed perforations." In the context of this question, these thin, atrophic areas are classified under the pathology of healed perforations. **2. Why other options are incorrect:** * **Atelectasis:** This refers to the collapse or retraction of the tympanic membrane into the middle ear space due to prolonged negative middle ear pressure (Eustachian tube dysfunction). While a monomeric (healed) area is more prone to atelectasis because it is weak, the term "atelectasis" describes the *displacement* of the drum, not the healed area itself. * **Both/None:** Since "Perforations" (specifically healed/monomeric) is the standard clinical description for these thin areas, these options are incorrect. **Clinical Pearls for NEET-PG:** * **Monomeric Membrane:** A hallmark of a spontaneously healed TM. On otoscopy, it looks like a "hole" but moves with a Siegle’s bulb (unlike a true perforation). * **Layers of TM:** Normal TM has 3 layers; a healed perforation (monomeric) has only 2. * **Myringosclerosis:** If the healing process involves the deposition of hyaline and calcium in the fibrous layer, it appears as chalky white patches, often seen after chronic otitis media or ventilation tube insertion.
Question 220: Which of the following is associated with objective tinnitus?
- A. Meniere's disease
- B. Acoustic neuroma
- C. Ear wax
- D. Glomus tumor (Correct Answer)
Explanation: **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.
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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