Otology — MCQs

Otology Indian Medical PG Practice Questions and MCQs

Question 311: In a patient with unilateral hearing loss and tinnitus, which anatomical part of the ear is likely to be affected?

A. External auditory canal
B. Middle ear
C. Inner ear (Correct Answer)
D. Eustachian tube

Explanation: ***Inner ear*** - Conditions affecting the **inner ear**, such as **Ménière's disease** (which involves fluid imbalance in the labyrinth) or **vestibular schwannoma** (a tumor on the vestibulocochlear nerve), commonly present with both **unilateral hearing loss** and **tinnitus**. - The inner ear houses the **cochlea** (responsible for hearing) and the **vestibular system** (responsible for balance); damage here can directly lead to hearing deficits and the perception of sound when none is present. *External auditory canal* - Problems in the **external auditory canal**, such as **cerumen impaction** or **otitis externa**, might cause **unilateral hearing loss** but are less likely to cause tinnitus. - Hearing loss from external canal issues is typically **conductive** and rarely associated with tinnitus unless pressure changes or secondary inflammation affect other structures. *Middle ear* - **Middle ear** pathologies like **otitis media** or **otosclerosis** often lead to **conductive hearing loss** and can sometimes cause tinnitus due to altered sound transmission. - However, the combination of significant unilateral tinnitus and hearing loss is more characteristic of **sensorineural** pathology originating in the inner ear or auditory nerve. *Eustachian tube* - **Eustachian tube dysfunction** can lead to a sensation of **fullness**, **muffled hearing**, and sometimes **tinnitus** due to pressure changes. - While it can cause unilateral symptoms, the primary disturbance is often related to sound transmission rather than direct damage to the auditory sensory cells that generate tinnitus and significant sensorineural hearing loss.

Question 312: A 45-year-old patient with profound bilateral sensorineural hearing loss is being evaluated for cochlear implantation. Preoperative imaging reveals a narrow cochlear nerve canal. What is the significance of this finding?

A. Suggests a poor prognosis for cochlear implant performance (Correct Answer)
B. Requires further auditory brainstem response testing
C. Indicates a potential for surgical complications due to anatomical constraints
D. Implies that alternative surgical approaches may be considered

Explanation: ***Suggests a poor prognosis for cochlear implant performance*** - A **narrow cochlear nerve canal** often indicates **hypoplasia** or **aplasia** of the **cochlear nerve**, meaning there are fewer or no functional nerve fibers to stimulate. - The effectiveness of a cochlear implant relies on the presence of an adequate number of **spiral ganglion cells** and **cochlear nerve fibers** to transmit electrical signals to the brain. *Indicates a potential for surgical complications due to anatomical constraints* - While a narrow canal can present **surgical challenges** (e.g., difficulty inserting the electrode array), it primarily impacts the **functional outcome** rather than severely increasing direct surgical complications. - The main concern regarding a narrow cochlear nerve canal is the **underlying neural deficit**, which affects implant performance, not necessarily the surgical maneuver itself. *Implies that alternative surgical approaches may be considered* - An alternative surgical approach might be considered for conditions like **ossification of the cochlea** or unusual cochlear anatomy, but a narrow cochlear nerve canal points to a **neural rather than mechanical issue**, making surgical approach changes less relevant to the core problem. - The type of surgical approach (e.g., **transmastoid**, **scala tympani insertion**) primarily addresses access to the cochlea, not the **neural integrity** of the cochlear nerve. *Requires further auditory brainstem response testing* - **Auditory Brainstem Response (ABR) testing** is typically performed **earlier in the diagnostic process** to confirm the type and severity of hearing loss and assess nerve function, often before detailed imaging. - While ABR can provide information about the **neural pathway**, the imaging finding of a **narrow canal** already directly suggests **neural hypoplasia** or aplasia, making additional ABR testing redundant for this specific *implication* of a narrow canal.

Question 313: Simple mastoidectomy is done in:

A. Acute mastoiditis
B. Cholesteatoma
C. Coalescent mastoiditis (Correct Answer)
D. Localized chronic otitis media and cholesteatoma

Explanation: ***Coalescent mastoiditis*** - **Simple mastoidectomy** is the definitive surgical treatment for **coalescent mastoiditis**, which is acute mastoiditis with destruction of the bony septa between mastoid air cells. - This occurs when acute mastoiditis does not respond to intravenous antibiotics and progresses to bone destruction and coalescence of air cells. - The procedure involves **complete exenteration of all diseased mastoid air cells** while preserving the posterior canal wall and middle ear structures. - Key indications: persistent fever despite antibiotics, subperiosteal abscess formation, or impending intracranial complications. *Acute mastoiditis* - **Uncomplicated acute mastoiditis** is primarily managed with **intravenous antibiotics** and myringotomy if needed. - Simple mastoidectomy is reserved for cases that progress to **coalescent mastoiditis** or develop complications like abscess formation. - Most cases resolve with medical management alone within 48-72 hours. *Cholesteatoma* - **Cholesteatoma** requires more extensive surgical procedures such as **canal wall-down mastoidectomy** or **modified radical mastoidectomy**. - These procedures ensure complete removal of the cholesteatoma matrix and prevention of recurrence. - Simple mastoidectomy is **insufficient** for cholesteatoma management as it does not adequately address the disease. *Localized chronic otitis media and cholesteatoma* - **Chronic otitis media** (mucosal or squamous type) requires **intact canal wall** or **canal wall-down mastoidectomy** depending on disease extent, not simple mastoidectomy. - The presence of cholesteatoma mandates more radical surgical approaches to ensure complete eradication. - Simple mastoidectomy does not provide adequate exposure or disease clearance for these conditions.

Question 314: What does the SADE classification specifically assess in otology?

A. Severity of tympanic membrane retraction (Correct Answer)
B. Type of Glomus tumor
C. Extent of CSF rhinorrhea
D. Staging of cholesteatoma

Explanation: ***Severity of tympanic membrane retraction*** - The **SADE classification** (also known as the **Sade classification**) is a system used in otology to categorize the degree and extent of **tympanic membrane retraction** pockets. - It helps clinicians determine the prognosis and guide treatment strategies for patients with **otitis media with effusion** or chronic otitis media. - The classification ranges from **Grade I** (mild retraction) to **Grade IV** (severe retraction with adhesion to promontory or ossicles). *Type of Glomus tumor* - The classification of **Glomus tumors** (e.g., in the ear or neck) typically involves systems like the **Glasscock-Jackson classification** or the **Fisch classification**, which assess tumor size, location, and extension. - The **SADE classification** is not used for classifying Glomus tumors. *Staging of cholesteatoma* - **Cholesteatoma staging** uses different classification systems such as the **STAM classification** (Stage, Type, Activity, Mastoid) or surgical classification systems based on extent and complications. - The **SADE classification** specifically addresses tympanic membrane retraction, which may predispose to cholesteatoma, but does not stage cholesteatoma itself. *Extent of CSF rhinorrhea* - **CSF rhinorrhea**, the leakage of cerebrospinal fluid through the nose, is evaluated based on its cause, location of the leak, and volume of fluid, often using imaging studies like cisternography. - There is no direct application of the **SADE classification** to assess the extent of CSF rhinorrhea.

Question 315: Which of the following is a cause of objective tinnitus?

A. Impacted Wax
B. Carotid artery aneurysm (Correct Answer)
C. Meniere's disease
D. Ototoxic drugs

Explanation: ***Carotid artery aneurysm*** - An **aneurysm** of the **carotid artery** can cause pulsatile tinnitus that is audible to others (objective) due to turbulent blood flow. - The sounds originate from vascular structures within or near the ear, making them detectable by a clinician. *Impacted Wax* - **Impacted cerumen** is a common cause of **subjective tinnitus**, where the sound is heard only by the patient. - It can muffle external sounds and alter the perception of internal body sounds, but it does not produce a sound audible to others. *Meniere's disease* - **Meniere's disease** is characterized by **subjective tinnitus**, along with vertigo, hearing loss, and aural fullness. - The tinnitus in Meniere's is typically a low-pitched roaring or buzzing sound, audible only to the affected individual. *Ototoxic drugs* - **Ototoxic drugs** (e.g., aspirin, aminoglycosides) commonly induce **subjective tinnitus** as a side effect. - These medications primarily damage inner ear structures, leading to perceived sounds that are not externally measurable.

Question 316: Rosen's incision is used for which surgical procedure?

A. Septoplasty
B. Stapedectomy (Correct Answer)
C. Tonsillectomy
D. Tympanoplasty

Explanation: ***Stapedectomy*** - **Rosen's incision** is a **curved incision in the posterior ear canal** specifically used for **stapedectomy** surgery. - This incision provides excellent exposure of the **middle ear** and particularly the **stapes footplate** for otosclerosis surgery. - The incision extends from approximately **6 o'clock to 12 o'clock** position in the posterior canal, allowing the tympanomeatal flap to be elevated. *Tympanoplasty* - **Tympanoplasty** (repair of perforated tympanic membrane) can use various incisions including **permeatal**, **endaural**, or **postauricular** approaches. - While transmeatal approaches are used, they are not specifically termed "Rosen's incision," which is reserved for stapes surgery. *Septoplasty* - **Septoplasty** is a nasal procedure for correcting a deviated septum using incisions like **hemitransfixion** or **Killian's incision**. - This procedure involves the **nasal septum**, not the ear canal. *Tonsillectomy* - **Tonsillectomy** is performed entirely through an **oral approach** for removal of palatine tonsils. - No external or ear canal incisions are involved.

Question 317: The FISCH classification is primarily used for which type of tumor?

A. Juvenile nasopharyngeal angiofibroma
B. Paraganglioma
C. Vestibular schwannoma
D. Glomus tumor (Correct Answer)

Explanation: ***Glomus tumor*** - The **Fisch classification** is a widely used staging system specifically designed for **glomus tumors** (paragangliomas) of the temporal bone, aiding in surgical planning and prognosis. - It categorizes these tumors based on their extent of involvement, from the middle ear (Type A) to intracranial extension (Type D). - **Note:** While glomus tumors are a type of paraganglioma, the Fisch classification specifically uses the term "glomus tumor" and refers to temporal bone paragangliomas (glomus tympanicum and glomus jugulare). *Paraganglioma* - This is **technically correct** as glomus tumors ARE paragangliomas, but this answer is **too broad**. - Paragangliomas encompass a wider range of neuroendocrine tumors occurring throughout the body (carotid body tumors, vagal paragangliomas, etc.). - The Fisch classification is **specifically** for temporal bone paragangliomas, which are traditionally called "glomus tumors" in ENT literature. - In exam context, "glomus tumor" is the more specific and expected answer. *Juvenile nasopharyngeal angiofibroma* - These are benign, highly vascular tumors typically found in adolescent males. - They are staged using systems like the **Radkowski staging system**, **Sessions staging**, or the **Fisch system for infratemporal fossa approach** (different from the Fisch classification for glomus tumors). - While Fisch contributed to angiofibroma surgery classification, the "Fisch classification" without qualification refers to glomus tumors. *Vestibular schwannoma* - Vestibular schwannomas are benign tumors arising from the Schwann cells of the vestibular nerve. - They are staged using the **Koos grading system** or **Samii classification** based on size and extension into the cerebellopontine angle and internal auditory canal, not the Fisch classification.

Question 318: Electrode of cochlear implant is placed in:

A. Horizontal semicircular canal
B. Scala media
C. Scala tympani (Correct Answer)
D. Scala vestibuli

Explanation: ***Scala tympani*** - The electrode array of a **cochlear implant** is carefully inserted into the **scala tympani** of the cochlea. - This placement allows the electrodes to directly stimulate the **spiral ganglion neurons**, bypassing damaged hair cells and transmitting electrical signals to the auditory nerve. *Horizontal semicircular canal* - The **horizontal semicircular canal** is part of the **vestibular system**, responsible for sensing angular head movements, not hearing. - Placing an electrode here would cause **vestibular dysfunction** and would not restore hearing. *Scala media* - The **scala media** (cochlear duct) contains the **organ of Corti** and **endolymph**, which has a high potassium concentration. - Inserting an electrode here would damage the delicate structures essential for natural sound transduction and could lead to electric potential imbalances. *Scala vestibuli* - The **scala vestibuli** is filled with **perilymph** and receives sound vibrations from the stapes. - While it's adjacent to the scala tympani, the **scala tympani** offers a safer and more direct path for optimal electrode insertion with less trauma to the sensory structures.

Question 319: Most commonly used tuning fork in ear examination?

A. 128 Hz
B. 256 Hz
C. 512 Hz (Correct Answer)
D. 1024 Hz

Explanation: ***512 Hz*** - The **512 Hz tuning fork** is the most commonly recommended and used for auditory tests like **Rinne** and **Weber** because its vibratory decay is slow enough to allow adequate testing, and it falls within the **speech frequency range**. - Its frequency is optimal for assessing both **bone conduction** and **air conduction** without introducing confusing overtones or being too low to be felt as a vibration rather than heard as a tone. *128 Hz* - A **128 Hz tuning fork** produces a strong vibratory sensation and is primarily used for **neurological examinations** to test **vibration sense**, not typically for ear examinations. - Its low frequency can be easily perceived as a **tactile vibration** through bone, making it less ideal for purely auditory assessment. *256 Hz* - While it falls within the audible range, a **256 Hz tuning fork** is less commonly used than 512 Hz for standard hearing tests. - Its vibratory tone may have a faster decay and might not provide as clear a distinction for **bone conduction** as the 512 Hz fork. *1024 Hz* - A **1024 Hz tuning fork** is a higher frequency tone, which may decay too quickly for accurate **Rinne and Weber tests**, especially when assessing subtle differences in hearing. - While audible, its higher pitch can be less representative of the critical **speech frequencies** typically evaluated in basic hearing screenings.

Question 320: 65-year-old person with hearing loss with normal speech discrimination is suffering from?

A. Noise induced hearing loss
B. Presbycusis (Correct Answer)
C. Ototoxic drug
D. NOHL

Explanation: ***Presbycusis*** - **Presbycusis**, or age-related hearing loss, is characterized by a gradual, symmetrical, **sensorineural hearing loss** primarily affecting high frequencies. - Importantly, **speech discrimination** is typically preserved in the early and moderate stages of presbycusis, which aligns with the normal speech discrimination in a 65-year-old. *Noise induced hearing loss* - **Noise-induced hearing loss** is caused by exposure to loud noise and often presents with a characteristic **4 kHz notch** in the audiogram. - While it can cause sensorineural hearing loss, it's not exclusively defined by the age-related onset and might involve more significant **speech discrimination difficulties** depending on the severity and frequency range affected. *Ototoxic drug* - Hearing loss due to **ototoxic drugs** (e.g., aminoglycosides, cisplatin) typically manifests as a **bilateral, high-frequency sensorineural hearing loss** that can progress rapidly. - The history of **drug exposure** would be a key differentiating factor, and while speech discrimination can be affected, the lack of other specific details makes this less likely without further information. *NOHL* - **NOHL** is not a standard, recognized medical acronym for a specific type of hearing loss. - This option is likely a distractor and does not represent a known diagnosis fitting the described clinical picture.

Practice by Chapter

Tympanic Membrane Perforation

Practice Questions

Cholesteatoma

Practice Questions

Tympanoplasty Techniques

Practice Questions

Ossicular Chain Reconstruction

Practice Questions

Mastoidectomy

Practice Questions

Stapedectomy

Practice Questions

Implantable Hearing Devices

Practice Questions

Congenital Aural Atresia

Practice Questions

Otologic Trauma

Practice Questions

Glomus Tumors

Practice Questions

Facial Nerve Decompression

Practice Questions

Rehabilitative Audiology

Practice Questions

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Otology — MCQs

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