Neurotology Practice Questions

Q: What is another name for glue ear?

Serous otitis media. **Explanation:** **Glue ear** is a clinical condition characterized by the accumulation of a non-purulent, highly viscous, and "glue-like" fluid in the middle ear cleft. This condition is formally known as **Serous Otitis Media (SOM)** or **Otitis Media with Effusion (OME)**. **Why Option A is correct:** The underlying pathophysiology involves **Eustachian tube dysfunction**, leading to negative pressure in the middle ear. This causes transudation of fluid and an increase in goblet cell activity, producing thick, tenacious secretions. Because the fluid is sterile (non-infectious) and thick, it is colloquially termed "glue ear." **Why the other options are incorrect:** * **B. Chronic Suppurative Otitis Media (CSOM):** This involves a permanent perforation of the tympanic membrane with chronic ear discharge (otorrhea), unlike the intact membrane seen in glue ear. * **C. Acute Mastoiditis:** This is a complication of acute infection involving the mastoid air cells, presenting with retroauricular pain, swelling, and fever. * **D. Acute Suppurative Otitis Media (ASOM):** This is an acute bacterial infection of the middle ear characterized by pain (otalgia), fever, and pus formation, whereas glue ear is typically painless and non-suppurative. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of hearing loss in children:** Glue ear (conductive hearing loss). * **Otoscopy finding:** Dull, retracted tympanic membrane with restricted mobility (assessed via Siegel’s speculum). * **Tympanometry:** Shows a **Type B (flat) curve**, which is pathognomonic. * **Treatment of choice:** Myringotomy with **Grommet (Ventilation Tube) insertion**, usually in the anteroinferior quadrant. * **Red Flag:** Unilateral serous otitis media in an adult is **Nasopharyngeal Carcinoma** until proven otherwise (due to obstruction of the Eustachian tube orifice).

Q: A person hearing two different tones in the left and right ears when presented with a single tone. What is this condition called?

Diplacusis. ### Explanation **Correct Answer: A. Diplacusis** **Diplacusis** (literally "double hearing") is a clinical phenomenon where a single auditory stimulus is perceived differently by the two ears. The specific type described in the question is **Diplacusis Binauralis**, where the same frequency is perceived as having a different pitch in each ear. This occurs due to a mismatch in the cochlear tuning mechanisms, often resulting from inner ear pathology (e.g., Meniere’s disease or acoustic trauma) that affects the hair cells on the basilar membrane. **Analysis of Incorrect Options:** * **B. Paracusis:** This refers to a distortion of hearing. The most common form tested is *Paracusis Willisii*, where a patient with Otosclerosis hears better in noisy environments because the background noise forces others to speak louder. * **C. Presbycusis:** This is age-related sensorineural hearing loss. It is typically bilateral, symmetrical, and affects high frequencies first due to the degeneration of the organ of Corti. * **D. Hyperacusis:** This is an abnormal sensitivity or intolerance to everyday sounds that are comfortable for others. It is often associated with a loss of the stapedial reflex (e.g., Facial nerve palsy) or recruitment. **Clinical Pearls for NEET-PG:** * **Diplacusis** is a classic early symptom of **Meniere’s Disease**, reflecting endolymphatic hydrops. * **Recruitment:** This is the rapid growth of loudness perception in an ear with sensorineural hearing loss. It is a hallmark of **cochlear lesions** (e.g., Meniere’s) and is absent in retrocochlear lesions (e.g., Vestibular Schwannoma). * **Roll-over Phenomenon:** If speech discrimination scores decrease as the intensity of sound increases, it strongly suggests a **retrocochlear** lesion.

Q: What is the treatment of choice for central perforation?

Conservative management. **Explanation:** The treatment of choice for a central perforation is **Conservative management**. A central perforation is defined as a hole in the pars tensa where the margins are surrounded by a rim of the tympanic membrane (the annulus is intact). Most traumatic or acute inflammatory (ASOM) central perforations have a high rate of **spontaneous healing**. The initial management focuses on keeping the ear dry, preventing infection (using systemic antibiotics if needed), and avoiding water entry. Surgical intervention is only considered if the perforation fails to heal after 3–6 months or if there is chronic infection (CSOM). **Analysis of Incorrect Options:** * **Myringoplasty:** This is the surgical repair of the tympanic membrane alone. While it is the definitive treatment for a *persistent* dry central perforation, it is not the initial "treatment of choice" as many heal spontaneously. * **Tympanoplasty:** This involves repair of the tympanic membrane along with ossicular reconstruction. It is indicated only if there is associated ossicular chain damage or chronic mucosal disease. * **Modified Mastoidectomy:** This is indicated for "unsafe" or attico-antral disease (cholesteatoma) to exteriorize the disease. Central perforations are characteristic of "safe" or tubotympanic disease, where mastoid surgery is rarely the primary step. **Clinical Pearls for NEET-PG:** * **Most common site:** The anteroinferior quadrant is the most common site for a central perforation. * **Patch Test:** Used pre-operatively to determine if closing the perforation will improve hearing (assesses ossicular integrity). * **Paper Patching:** A conservative office procedure for small, non-healing traumatic perforations to provide a scaffold for epithelial migration. * **Rule of Thumb:** Never perform surgery on an acutely discharging ear; wait for a "dry ear" period (usually 6 weeks).

Q: Gradenigo's syndrome is characterized by all of the following except?

Veigo. **Gradenigo’s Syndrome** (also known as apical petrositis) is a classic clinical triad resulting from the spread of infection from the middle ear to the **petrous apex** of the temporal bone. ### **Explanation of the Correct Answer** **D. Vertigo** is the correct answer because it is **not** part of the classic Gradenigo’s triad. Vertigo typically indicates involvement of the vestibular system (labyrinthitis) or the internal auditory canal. While petrositis can occasionally cause vestibular symptoms if the infection spreads further, it is not a defining feature of the syndrome. ### **Analysis of Incorrect Options** The syndrome is defined by the following triad: * **A. Retro-orbital pain:** Caused by irritation of the **Trigeminal nerve (CN V)**, specifically the Gasserian ganglion located in Meckel’s cave near the petrous apex. * **B. Diplopia:** Caused by **Abducens nerve (CN VI) palsy**. The nerve is affected as it passes through **Dorello’s canal**, which is situated between the petrous tip and the sphenoid bone. This leads to paralysis of the lateral rectus muscle. * **C. Ear discharge:** Persistent **otorrhea** is a hallmark, usually secondary to chronic or acute suppurative otitis media (ASOM/CSOM) that has seeded the petrous air cells. ### **Clinical Pearls for NEET-PG** * **Anatomy:** Dorello’s canal is the most common site of CN VI compression in this syndrome. * **Diagnosis:** Contrast-enhanced **MRI** is the gold standard to visualize enhancement or abscess at the petrous apex. * **Treatment:** Aggressive intravenous antibiotics and surgical drainage (e.g., cortical mastoidectomy with petrous apicectomy). * **Mnemonic:** Remember **"6-5-Ear"** (CN VI palsy, CN V pain, and Ear discharge).

Q: What is the frequency range of normal human hearing?

20-20000 Hz. **Explanation:** The human ear is a sophisticated transducer that converts sound waves into electrical impulses. The standard physiological range of audible frequencies for a healthy young human is **20 Hz to 20,000 Hz (20 kHz)**. * **20 Hz** represents the lower limit (infrasound threshold), below which vibrations are felt as tactile sensations rather than heard as sound. * **20,000 Hz** represents the upper limit (ultrasound threshold). This upper limit is highly sensitive to age and noise exposure; as we age, the hair cells at the base of the cochlea (responsible for high frequencies) degenerate first. **Analysis of Incorrect Options:** * **Option A (20-4000 Hz):** This range covers the most critical frequencies for **speech perception**, but it is not the full limit of human hearing. * **Option B (20-8000 Hz):** This is the range typically tested during a **standard Pure Tone Audiometry (PTA)**. While clinically significant for diagnosing most hearing losses, it does not represent the maximum physiological capacity. * **Option C (20-10000 Hz):** While humans can hear up to this range, it excludes the high-frequency "brilliance" and overtones audible to the healthy human ear. **High-Yield Clinical Pearls for NEET-PG:** 1. **Speech Frequency:** The most important range for understanding human speech is **500 Hz to 2000 Hz**. 2. **Maximum Sensitivity:** The human ear is most sensitive to frequencies between **2000 and 5000 Hz**, largely due to the resonance of the external auditory canal. 3. **Presbycusis:** Age-related hearing loss typically begins with the loss of high-frequency sounds (above 8000 Hz). 4. **Noise-Induced Hearing Loss (NIHL):** Classically shows a "dip" or notch at **4000 Hz** (Acoustic Trauma Notch).

Q: Otosclerosis characteristically presents with which type of hearing loss?

Conductive hearing loss. **Explanation:** **Otosclerosis** is a primary metabolic bone disease of the otic capsule characterized by the replacement of normal bone with vascular spongy bone. The most common site of involvement is the **fissula ante fenestram** (just anterior to the oval window). 1. **Why Conductive Hearing Loss (CHL) is correct:** The hallmark of clinical otosclerosis is **stapedial fixation**. As the otosclerotic focus involves the annular ligament, the stapes footplate becomes fixed, preventing the efficient transmission of sound vibrations from the ossicular chain to the cochlea. This mechanical blockage results in a classic **Conductive Hearing Loss**. 2. **Why other options are incorrect:** * **Sensorineural Hearing Loss (SNHL):** While "Cochlear Otosclerosis" can cause SNHL due to the release of cytotoxic enzymes into the inner ear, it is less common than the stapedial (conductive) variety. * **Mixed Hearing Loss:** This occurs in advanced stages when both stapedial fixation and cochlear involvement coexist, but it is not the *characteristic* initial presentation. * **Fluctuating Hearing Loss:** This is a hallmark of **Meniere’s disease**, not otosclerosis, which typically presents with progressive loss. **High-Yield Clinical Pearls for NEET-PG:** * **Carhart’s Notch:** A characteristic dip in the bone conduction threshold at **2000 Hz** (mechanical artifact, disappears after stapedectomy). * **Schwartz Sign:** A flamingo-pink flush seen through the TM, indicating active otosclerosis (Otospongiosis). * **Gelle’s Test:** Negative (indicates fixed ossicles). * **Tympanometry:** Typically shows an **As type** curve (stiffened system). * **Treatment of Choice:** Stapedotomy (using a Teflon piston). Medical management involves **Sodium Fluoride** to arrest disease progression.

Question 1

Mc Ewans triangle is located on which anatomical structure?

Accepted Answer

Mastoid antrum

Answer

Inner ear

Answer

Cochlea

Answer

Saccule

Question 2

Subjective interference is present in which of the following audiological tests?

Accepted Answer

Pure tone audiometry

Answer

Impedance audiometry

Answer

Otoacoustic emission

Answer

Brainstem evoked potential

Question 3

A 10-year-old boy presents with torticollis, a tender swelling behind the angle of the mandible, and fever. He has a history of ear discharge for the past 6 years. Examination of the ear shows purulent discharge and granulations in the ear canal. What is the most probable diagnosis?

Accepted Answer

Bezold abscess

Answer

Acute lymphadenitis secondary to otitis externa

Answer

Masked mastoiditis

Answer

Parotitis

Question 4

What is another name for glue ear?

Accepted Answer

Serous otitis media

Answer

Chronic suppurative otitis media

Answer

Acute mastoiditis

Answer

Acute suppurative otitis media

Question 5

A person hearing two different tones in the left and right ears when presented with a single tone. What is this condition called?

Accepted Answer

Diplacusis

Answer

Paracusis

Answer

Presbycusis

Answer

Hyperacusis

Question 6

The inner ear is located within which bone?

Accepted Answer

Petrous part of the temporal bone

Answer

Parietal bone

Answer

Occipital bone

Answer

Petrous part of the squamous bone

Question 7

What is the treatment of choice for central perforation?

Accepted Answer

Conservative management

Answer

Modified mastoidectomy

Answer

Tympanoplasty

Answer

Myringoplasty

Question 8

Gradenigo's syndrome is characterized by all of the following except?

Accepted Answer

Veigo

Answer

Retro-orbital pain

Answer

Diplopia

Answer

Ear discharge

Question 9

What is the frequency range of normal human hearing?

Accepted Answer

20-20000 Hz

Answer

20-4000 Hz

Answer

20-8000 Hz

Answer

20-10000 Hz

Question 10

Otosclerosis characteristically presents with which type of hearing loss?

Accepted Answer

Conductive hearing loss

Answer

Sensorineural hearing loss

Answer

Mixed hearing loss

Answer

Fluctuating hearing loss

Neurotology — MCQs

Neurotology — MCQs

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