Otology — MCQs

Otology Indian Medical PG Practice Questions and MCQs

Question 301: For myringoplasty, Graft material of choice is -

A. Fascia lata
B. Peritoneum
C. Palmar fascia
D. Temporalis fascia (Correct Answer)

Explanation: ***Temporalis fascia*** - The **temporalis fascia** is the most commonly used graft material in myringoplasty due to its **reliability**, good handling characteristics, and excellent cosmetic outcome. - It is readily available adjacent to the surgical field and provides a strong, durable graft for tympanic membrane repair. *Fascia lata* - **Fascia lata** can be used as a graft material but is typically reserved for cases where other tissues are unavailable or for larger defects, due to its **thicker nature** and less favorable cosmetic outcome. - Its harvest requires a separate incision in the thigh, which may increase surgical time and potential for donor site morbidity. *Peritoneum* - **Peritoneum** is not a standard graft material for myringoplasty. Its thin, fragile nature and the need for an abdominal incision make it an impractical choice for tympanic membrane repair. - It lacks the structural integrity and handling characteristics desired for successful myringoplasty. *Palmar fascia* - **Palmar fascia** is not typically used for myringoplasty. Its location in the hand and the potential for donor site complications make it unsuitable for ear surgery. - Furthermore, its characteristics do not offer advantages over more commonly accepted graft materials.

Question 302: Schwartze's operation is also called as:

A. Modified radical mastoidectomy
B. Radical mastoidectomy
C. Fenestration operation
D. Cortical mastoidectomy (Correct Answer)

Explanation: ***Cortical mastoidectomy*** - **Schwartze's operation** is synonymous with **cortical mastoidectomy**, which involves removing diseased mastoid air cells while preserving the ear canal and ossicular chain. - This procedure is typically performed for acute **coalescent mastoiditis**. *Modified radical mastoidectomy* - This involves removing the mastoid air cells and the posterior wall of the external auditory canal while preserving the **tympanic membrane** and ossicles (or a portion of them). - It is often performed for **cholesteatoma** with good hearing. *Radical mastoidectomy* - This is the most extensive mastoidectomy procedure, involving complete removal of mastoid air cells, middle ear structures, and the posterior canal wall to create a common cavity. - It is performed for extensive **cholesteatoma** or chronic ear disease when hearing preservation is not possible. *Fenestration operation* - This is a surgical procedure to create a new opening (fenestra) in the **horizontal semicircular canal** to improve hearing in cases of otosclerosis. - This procedure is not a mastoidectomy and addresses a different etiology of hearing loss.

Question 303: True about Glomus jugulare are all EXCEPT:

A. Involves 9th and 10th cranial nerve
B. Rising sun sign is seen
C. Pulsatile tinnitus is seen
D. Invades epitympanum (Correct Answer)

Explanation: ***Invades epitympanum*** - Glomus jugulare tumors typically arise from the **jugular bulb** and primarily affect the **hypotympanum and mesotympanum**, causing bone erosion of the **jugular foramen** and temporal bone. - Epitympanum invasion is more characteristic of **glomus tympanicum** tumors (which arise from the promontory or tympanic plexus), NOT glomus jugulare. - While glomus jugulare can extend superiorly with growth, the **epitympanum is not the primary or characteristic site of invasion** for this tumor type. *Involves 9th and 10th cranial nerve* - **Glomus jugulare tumors** are often associated with cranial nerve palsies due to their proximity to the **jugular foramen**, which transmits the **glossopharyngeal (IX)** and **vagus (X)** nerves. - Compression or invasion of these nerves can lead to symptoms like **dysphagia**, **hoarseness**, or **vocal cord paralysis**. *Rising sun sign is seen* - The **"rising sun" sign** refers to the reddish-blue hue observed behind the tympanic membrane in a patient with a **glomus tumor**, caused by the highly vascularized mass in the middle ear. - This sign is a classic clinical finding indicating the presence of a **middle ear mass**, often a glomus tumor. *Pulsatile tinnitus is seen* - **Pulsatile tinnitus** is a very common symptom of **glomus jugulare tumors**, due to their highly vascular nature and blood flow creating a sound synchronous with the patient's heartbeat. - The patient often describes hearing a **"whooshing"** or **"thumping"** sound in the ear.

Question 304: A patient with cholesteatoma has lateral semicircular canal fistula. The most specific sign is:

A. Head thrust test
B. Fistula test (Correct Answer)
C. Hennebert's sign
D. Dix-Hallpike test

Explanation: ***Fistula test*** - The **fistula test** (Positive pressure test or Hennebert's test) directly assesses for a communication between the middle ear and the labyrinth by applying positive or negative pressure to the external auditory canal. - A positive result, indicated by **nystagmus** or **vertigo** induced by pressure changes, is the **most specific sign** for a **labyrinthine fistula** in the context of **cholesteatoma**. - The lateral semicircular canal is the most commonly affected site in cholesteatoma-related fistulae. *Hennebert's sign* - **Hennebert's sign** refers to **nystagmus** or **vertigo** induced by pressure changes in the external auditory canal **in the absence of an actual fistula**. - It represents a **false positive fistula test** and is classically associated with **congenital syphilis**, **Meniere's disease**, or other conditions causing increased labyrinthine membrane mobility. - In this case with a **confirmed fistula**, the positive pressure test would be called a **positive fistula test**, not Hennebert's sign. *Head thrust test* - The **head thrust test** evaluates the function of the **vestibulo-ocular reflex (VOR)** and is used to detect **peripheral vestibular hypofunction**. - While cholesteatoma can affect vestibular function, this test is **not specific** for identifying a **labyrinthine fistula**. *Dix-Hallpike test* - The **Dix-Hallpike test** is used to diagnose **Benign Paroxysmal Positional Vertigo (BPPV)** by identifying nystagmus and vertigo triggered by specific head positions. - This test detects **otoconia displacement** in the semicircular canals and is **not relevant** for identifying a **labyrinthine fistula**.

Question 305: A factory worker develops hearing loss. Most likely affected frequency range (Hz)?

A. 3000-6000 Hz (Correct Answer)
B. 8000-10000 Hz
C. 500-1000 Hz
D. 1000-2000 Hz

Explanation: ***3000-6000*** - **Noise-induced hearing loss (NIHL)**, common in factory workers, typically affects the **higher frequencies** first, particularly the 3000-6000 Hz range. - This specific range includes a characteristic "notch" at **4000 Hz** often seen in audiograms of individuals with NIHL. *8000-10000* - While high frequencies can be affected, the **initial and most pronounced damage** in NIHL often occurs at slightly lower frequencies (3000-6000 Hz). - Hearing loss at over **8000 Hz** is usually associated with presbycusis (age-related hearing loss) or ototoxic medications rather than primarily NIHL. *500-1000* - Hearing loss in the **lower frequencies** (500-1000 Hz) is less common for early manifestations of noise-induced hearing loss. - Loss in this range is more indicative of **conductive hearing loss** or other types of sensorineural hearing loss, but not typically NIHL. *1000-2000* - While important for speech comprehension, this range is generally affected **later** in the progression of noise-induced hearing loss. - Initial pure tone audiogram changes due to NIHL are rarely seen initially at these frequencies, with the **4000 Hz notch** being a hallmark.

Question 306: Assertion: Otosclerosis results in sensorineural hearing loss in the late stages. Reason: In otosclerosis, abnormal bone growth occurs at the stapes footplate, leading to fixation of the stapes and conductive hearing loss.

A. Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.
B. Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion. (Correct Answer)
C. Both Assertion and Reason are false.
D. Assertion is true, but Reason is false.

Explanation: ***Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion.*** - The Assertion is true: In late stages of otosclerosis, the **sensorineural component** of hearing loss can develop due to the spread of otosclerotic foci to the inner ear, affecting the **cochlea** (cochlear otosclerosis). - The Reason is also true: **Otosclerosis** primarily involves abnormal **bone remodeling** around the **stapes footplate**, which initially causes **conductive hearing loss** due to the stapes' fixation and impaired sound transmission. - However, the Reason explains the **initial mechanism** of conductive hearing loss, NOT the **late-stage sensorineural component** mentioned in the Assertion. - The **sensorineural hearing loss** in otosclerosis results from the release of **toxic enzymes or metabolites** from active otosclerotic foci into the inner ear fluid, or direct involvement of the **cochlea** by the otosclerotic process. *Incorrect: Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.* - While both statements are true, the Reason describes the **early conductive phase** (stapes fixation), not the mechanism behind **late-stage sensorineural loss** mentioned in the Assertion. - These are two different phases and mechanisms of the same disease process. *Incorrect: Both Assertion and Reason are false.* - Both statements are medically accurate descriptions of **otosclerosis**. - **Otosclerosis** is a well-established condition characterized by abnormal bone remodeling that initially causes conductive hearing loss, with potential progression to mixed or sensorineural hearing loss in advanced stages. *Incorrect: Assertion is true, but Reason is false.* - The Reason accurately describes the **pathophysiology** of early otosclerosis: abnormal **bone growth** around the **stapes footplate** leading to fixation and **conductive hearing loss**. - This is the hallmark presentation of the condition.

Question 307: A 60-year-old patient with profound sensorineural hearing loss is being evaluated for cochlear implantation. What is the impact of preoperative auditory brainstem response on the surgery?

A. Confirms functional auditory nerve. (Correct Answer)
B. Not necessary as CI can function without nerve input.
C. Only relevant in cases of mixed hearing loss.
D. Only for patients with suspected neural loss.

Explanation: ***Confirms functional auditory nerve*** - A positive **auditory brainstem response (ABR)** indicates that the **auditory nerve** is intact and capable of transmitting signals, a prerequisite for successful cochlear implantation. - While cochlear implants bypass damaged hair cells, a **functional auditory nerve** is essential for relaying electrical signals to the brain. *Not necessary as CI can function without nerve input.* - **Cochlear implants** directly stimulate the **auditory nerve**, so **nerve integrity** is crucial for the device to effectively transmit sound information to the brain. - Without a functional nerve, the electrical signals generated by the implant cannot be processed, rendering the device ineffective. *Only relevant in cases of mixed hearing loss.* - **Preoperative ABR** is critical for all profound **sensorineural hearing loss** cases being considered for cochlear implantation to assess the status of the **auditory nerve**. - Its utility is not limited to **mixed hearing loss**, as the primary concern for CI candidacy is the integrity of the **neuronal pathway**. *Only for patients with suspected neural loss.* - **ABR testing** is a standard component of evaluation for **cochlear implant candidates**, regardless of whether **neural loss** is specifically "suspected" based on other findings. - It provides objective data on the **auditory nerve's function**, which is distinct from the **cochlear (sensory) component** of hearing.

Question 308: In which of the following structures is the electrode of a cochlear implant placed?

A. Scala tympani (Correct Answer)
B. Round window
C. Eustachian tube
D. Oval window

Explanation: ***Scala tympani*** - The electrode array of a **cochlear implant** is carefully threaded into the **scala tympani** of the cochlea. - This placement allows direct electrical stimulation of the **auditory nerve fibers**, bypassing damaged hair cells. *Round window* - The **round window** serves as an entry point for the cochlear implant electrode, but the electrode itself is advanced beyond this opening. - It is a membrane-covered opening that allows pressure equalization in the cochlea, not the final resting place of the electrode array. *Eustachian tube* - The **Eustachian tube** connects the middle ear to the nasopharynx and is primarily involved in **pressure equalization** and drainage, not hearing. - It is anatomically distinct from the cochlea and has no role in cochlear implantation. *Oval window* - The **oval window** is where the stapes footplate transmits vibrations into the **scala vestibuli** of the cochlea, initiating the hearing process. - While an entry point to the inner ear, it is less commonly used for electrode insertion compared to the round window approach to the scala tympani, and the electrode's final position is not in the oval window itself.

Question 309: What is a critical factor to evaluate before proceeding with a cochlear implant in a 55-year-old male with profound sensorineural hearing loss in both ears?

A. Presence of functioning auditory nerve (Correct Answer)
B. Status of the middle ear
C. History of otitis media
D. Condition of the tympanic membrane

Explanation: ***Presence of functioning auditory nerve*** - A cochlear implant works by **bypassing damaged hair cells** in the cochlea and directly stimulating the auditory nerve. If the **auditory nerve is not functioning**, the implant will not be able to transmit sound signals to the brain. - This is a critical prerequisite because the implant relies entirely on the nerve's ability to translate electrical signals into perceived sound. *Condition of the tympanic membrane and its impact on overall ear health* - While a healthy tympanic membrane is important for overall ear health and some types of hearing loss, it is **not directly relevant** to the function of a cochlear implant for profound sensorineural hearing loss. - Cochlear implants **bypass the middle ear structures**, including the tympanic membrane, to directly stimulate the cochlea. *Status of the middle ear and its relevance to hearing loss* - The middle ear structures are involved in **conducting sound to the inner ear**, but in **profound sensorineural hearing loss**, the problem lies in the inner ear or auditory nerve, not typically the middle ear. - A cochlear implant does not rely on the integrity of the middle ear ossicles or function to restore hearing. *History of otitis media and its potential effects on hearing* - Otitis media (middle ear infection) can cause **conductive hearing loss** or contribute to mixed hearing loss, but it is not the primary cause of profound **sensorineural hearing loss**. - While a history of otitis media might necessitate surgical considerations regarding infection risk, it is **not the critical factor** for the implant's functional success in the way a functioning auditory nerve is.

Question 310: A 50-year-old male presents with persistent ear discharge and hearing loss. Otoscopic examination reveals a perforation in the pars tensa. What is the most likely diagnosis?

A. Acute otitis media
B. Chronic suppurative otitis media (Correct Answer)
C. Otosclerosis
D. Serous otitis media

Explanation: ***Chronic suppurative otitis media*** - This condition is characterized by **persistent ear discharge** (otorrhea) and **hearing loss** for more than 6-12 weeks, with a **permanent perforation of the tympanic membrane**. - The presence of a **perforation in the pars tensa** (the larger portion of the tympanic membrane) is the hallmark finding in CSOM, allowing ongoing infection and drainage. - Represents the most common cause of chronic ear discharge with conductive hearing loss in adults. *Acute otitis media* - This is an **acute infection** of the middle ear, typically resolving within a few weeks and often accompanied by **severe otalgia and fever**. - While perforation can occur, the discharge is **acute and self-limiting**, not persistent, and typically heals spontaneously. - The chronic, persistent nature of symptoms in this case rules out acute otitis media. *Otosclerosis* - Otosclerosis is a disease of the **otic capsule** causing **progressive conductive hearing loss** due to **stapes fixation**. - Presents with hearing loss **without ear discharge or tympanic membrane perforation**. - The tympanic membrane appears **normal** on otoscopy, which clearly differs from this presentation. *Serous otitis media* - Also called **otitis media with effusion**, characterized by **sterile fluid in the middle ear without signs of acute infection**. - Typically presents with a **retracted, amber-colored tympanic membrane** and **absence of discharge or perforation**. - No ear discharge is present, making this diagnosis inconsistent with the 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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