Otology — MCQs

Otology Indian Medical PG Practice Questions and MCQs

Question 51: Over the past 10 years, a 50-year-old male has had progressive difficulty hearing, particularly on the left side. Audiometry testing reveals that he has a bone conduction type of deafness. Which of the following conditions is he most likely to have?

A. Otosclerosis (Correct Answer)
B. Cholesteatoma
C. Schwannoma
D. Otitis media

Explanation: ### Explanation **Correct Answer: A. Otosclerosis** The patient presents with progressive hearing loss over 10 years and **bone conduction deafness**, which is a clinical synonym for **Conductive Hearing Loss (CHL)**. In CHL, sound cannot reach the inner ear effectively, but the cochlear function (tested via bone conduction) remains relatively preserved or shows a characteristic pattern. **Otosclerosis** is a primary metabolic bone disease of the otic capsule characterized by the replacement of normal bone with vascular spongy bone. It most commonly affects the **stapes footplate** (stapedial otosclerosis), leading to its fixation. This results in a slowly progressive, usually bilateral (but often asymmetrical) conductive hearing loss in adults aged 20–50. A classic audiometric finding is **Carhart’s Notch** (a dip in bone conduction at 2000 Hz). **Why the other options are incorrect:** * **B. Cholesteatoma:** While it causes CHL, it is typically associated with chronic ear discharge (foul-smelling) and tympanic membrane perforation/retraction. It is an erosive process rather than a purely progressive bony fixation. * **C. Schwannoma (Acoustic Neuroma):** This involves the 8th cranial nerve and results in **Sensorineural Hearing Loss (SNHL)**, not conductive (bone conduction) deafness. It is also associated with poor speech discrimination and vertigo. * **D. Otitis Media:** Acute otitis media presents with pain and fever; Chronic Suppurative Otitis Media (CSOM) presents with long-term discharge. While they cause CHL, the clinical history of "progressive difficulty over 10 years" without mention of discharge or infection strongly points toward Otosclerosis. **High-Yield Clinical Pearls for NEET-PG:** * **Schwartz Sign:** A flamingo-pink flush seen through the TM due to increased vascularity over the promontory (indicates active otosclerosis). * **Gelle’s Test:** Negative in otosclerosis (indicates stapes fixation). * **Treatment of Choice:** Stapedotomy or Stapedectomy (with Teflon prosthesis). * **Bezold’s Triad:** 1. Negative Rinne test, 2. Raised bone conduction (relative), 3. Low-frequency hearing loss.

Question 52: Unilateral conductive deafness after head injury is due to all EXCEPT:

A. Dislocation of incudostapedial joint
B. Perforation of tympanic membrane
C. Hemotympanum
D. Secretory otitis media (Correct Answer)

Explanation: ### Explanation The core concept behind this question is identifying the causes of **traumatic conductive hearing loss (CHL)** versus inflammatory/non-traumatic middle ear pathologies. **Why Secretory Otitis Media (SOM) is the correct answer:** Secretory Otitis Media (also known as Otitis Media with Effusion) is characterized by the accumulation of non-purulent fluid in the middle ear, typically due to **Eustachian tube dysfunction** or following an upper respiratory tract infection. It is a chronic or subacute inflammatory condition, not a direct sequela of acute head trauma. While trauma can cause bleeding (hemotympanum), it does not acutely cause the sterile, serous effusion seen in SOM. **Analysis of Incorrect Options (Causes of Traumatic CHL):** * **Dislocation of Incudostapedial (IS) Joint:** This is the **most common** ossicular chain disruption following head injury. The incus is the most vulnerable ossicle because it is suspended between the firmly attached malleus and the fixed stapes. * **Perforation of Tympanic Membrane:** Direct trauma (e.g., a slap or a foreign body) or indirect barotrauma from a head injury can rupture the membrane, leading to immediate CHL. * **Hemotympanum:** This refers to the presence of blood in the middle ear cavity, often seen in longitudinal fractures of the temporal bone. The blood acts as a physical barrier to sound conduction, causing temporary CHL. **NEET-PG High-Yield Pearls:** 1. **Most common ossicular lesion in trauma:** Incudostapedial joint dislocation. 2. **Most common ossicle to be fractured:** Incus (specifically the long process). 3. **Temporal Bone Fractures:** * **Longitudinal (80%):** More common; usually results in **Conductive Hearing Loss**. * **Transverse (20%):** Less common; usually results in **Sensorineural Hearing Loss** and Facial Nerve Palsy. 4. **Battle’s Sign:** Post-auricular ecchymosis indicating a fracture of the petrous temporal bone.

Question 53: Otospongiosis is inherited as?

A. Autosomal dominant (Correct Answer)
B. Autosomal recessive
C. X-linked dominant
D. X-linked recessive

Explanation: **Explanation:** **Otospongiosis (Otosclerosis)** is a primary metabolic bone disease of the otic capsule characterized by the replacement of normal dense bone with vascular irregular spongy bone. **1. Why Autosomal Dominant is Correct:** Otosclerosis is inherited as an **Autosomal Dominant** trait with **incomplete penetrance** (approximately 40%) and **variable expressivity**. This means that while the gene is dominant, not everyone who inherits it will manifest the clinical disease. About 50% of cases have a positive family history. The condition is most commonly seen in young adults (20–30 years), with a female-to-male ratio of 2:1, and it often progresses during pregnancy. **2. Why Other Options are Incorrect:** * **Autosomal Recessive:** While some sporadic cases occur, the classic familial pattern follows a dominant inheritance. Recessive patterns are more typical of congenital non-syndromic deafness (e.g., GJB2 mutations). * **X-linked Inheritance (Dominant/Recessive):** Otosclerosis shows no sex-linked linkage. Although it is more common in females, this is due to hormonal influences rather than X-chromosome inheritance. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Fissula ante fenestram (leads to stapedial fixation). * **Clinical Sign:** **Schwartze sign** (Flamingo flush) – reddish hue seen through the TM due to increased vascularity of the promontory. * **Audiometry:** **Carhart’s Notch** (dip in bone conduction at 2000 Hz). * **Tympanometry:** **As type** (Stiffened system) curve. * **Treatment of choice:** Stapedotomy (preferred over stapedectomy). * **Medical management:** Sodium fluoride (to mature active foci).

Question 54: A steel worker presented with noise-induced hearing loss. Which part of the inner ear is most likely affected?

A. Inner hair cell
B. Outer hair cell (Correct Answer)
C. Macula
D. Cupula

Explanation: **Explanation:** Noise-Induced Hearing Loss (NIHL) is a sensorineural hearing loss resulting from exposure to high-intensity sound. The primary site of pathology in the inner ear is the **Organ of Corti** within the cochlea. **1. Why Outer Hair Cells (OHCs) are the correct answer:** The **Outer Hair Cells** are the most metabolically active and mechanically fragile structures in the cochlea. They function as "cochlear amplifiers." Exposure to excessive noise leads to overstimulation, causing oxidative stress, mitochondrial dysfunction, and eventually structural damage or apoptosis of the OHCs. Damage typically begins at the basal turn of the cochlea, corresponding to high-frequency sounds (classically **4000 Hz**). **2. Why other options are incorrect:** * **Inner Hair Cells (IHCs):** While IHCs can be damaged in severe or chronic cases, they are more resilient than OHCs. OHC damage always precedes IHC damage in NIHL. * **Macula:** This is the sensory epithelium of the vestibule (utricle and saccule) responsible for linear acceleration and static equilibrium. It is not involved in hearing. * **Cupula:** This is a gelatinous structure in the ampulla of the semicircular canals responsible for angular acceleration. It is part of the vestibular system, not the auditory system. **Clinical Pearls for NEET-PG:** * **Acoustic Dip:** NIHL characteristically shows a V-shaped notch at **4 kHz** (Boiler-maker's notch) on an audiogram. * **Temporary Threshold Shift (TTS):** Reversible hearing loss (auditory fatigue) following noise exposure. * **Permanent Threshold Shift (PTS):** Irreversible damage due to prolonged exposure or high-intensity impulse noise. * **Presbycusis vs. NIHL:** Both affect high frequencies, but NIHL specifically targets 4 kHz initially, whereas presbycusis is a sloping loss starting at the highest frequencies.

Question 55: A 30-year-old male presents with attic cholesteatoma of the left ear complicated by lateral sinus thrombophlebitis. Which of the following surgical procedures would be the most appropriate treatment of choice?

A. Intact canal wall mastoidectomy
B. Canal wall down mastoidectomy (Correct Answer)
C. Mastoidectomy with cavity obliteration
D. Simple mastoidectomy with tympanoplasty

Explanation: **Explanation:** The patient presents with **attic cholesteatoma** (unsafe/squamosal type Chronic Suppurative Otitis Media) complicated by **lateral sinus thrombophlebitis**. In cases of cholesteatoma with intracranial or extracranial complications, the primary surgical goal is complete eradication of the disease and providing wide drainage to prevent further life-threatening progression. **Why Canal Wall Down (CWD) Mastoidectomy is correct:** CWD mastoidectomy (e.g., Modified Radical Mastoidectomy) involves the removal of the posterior canal wall, converting the external auditory canal and the mastoid antrum into a single, large, exteriorized cavity. This is the **treatment of choice** for attic cholesteatoma because it provides the best exposure to ensure all squamous epithelium is removed and allows for easy postoperative monitoring. In the presence of a complication like lateral sinus thrombophlebitis, a CWD procedure ensures adequate access to the sinus plate for decompression or needle aspiration if required. **Analysis of Incorrect Options:** * **A. Intact canal wall (ICW) mastoidectomy:** While it preserves the anatomy, it has a higher rate of residual/recurrent cholesteatoma. It is generally contraindicated in the presence of complications where "safety first" is the priority. * **C. Mastoidectomy with cavity obliteration:** Obliteration is usually a secondary step to reduce cavity problems. In the acute phase of a complication like thrombophlebitis, obliterating the cavity is risky as it may hide persistent infection. * **D. Simple mastoidectomy with tympanoplasty:** Simple mastoidectomy is used for "safe" ear disease (e.g., coalescent mastoiditis). It does not provide access to the attic or middle ear required to treat a cholesteatoma. **NEET-PG High-Yield Pearls:** * **Lateral Sinus Thrombophlebitis:** Characterized by "picket fence" fever and a positive **Griesinger’s sign** (edema over the mastoid due to thrombosis of the mastoid emissary vein). * **Investigation of Choice:** Contrast-enhanced MRI/MRV (shows the **Empty Delta Sign**). * **Management:** High-dose IV antibiotics + CWD Mastoidectomy. Internal Jugular Vein (IJV) ligation is rarely done today, reserved only for cases where septicemia persists despite surgery.

Question 56: What is the ratio of the surface area of the tympanic membrane to the surface area of the oval window?

A. 17:1 (Correct Answer)
B. 22:1
C. 50:1
D. 25:1

Explanation: ### Explanation The correct answer is **17:1**. This question tests your knowledge of the **Middle Ear Transformer Mechanism**, specifically the **Areal Ratio (Hydraulic Action)**. #### 1. Why 17:1 is Correct The middle ear acts as an impedance-matching device to compensate for the energy loss that occurs when sound waves travel from air to the fluid-filled cochlea. The most significant contributor to this is the **Areal Ratio**: * The total surface area of the tympanic membrane (TM) is approximately **90 mm²**. * However, the effective vibrating area of the TM is only about **55 mm²**. * The surface area of the stapes footplate (oval window) is approximately **3.2 mm²**. * The ratio of the effective area of the TM to the oval window is **55 : 3.2**, which equals **17:1**. This concentrates the sound pressure, increasing it by about 17 times. #### 2. Analysis of Incorrect Options * **B (22:1):** This is the **Total Transformer Ratio**. When you multiply the Areal Ratio (17:1) by the **Lever Ratio** of the ossicles (1.3:1), the result is approximately 22:1 (17 × 1.3 = 22.1). * **C & D (50:1 & 25:1):** These values do not correspond to standard physiological measurements of the human middle ear transformer system. #### 3. Clinical Pearls for NEET-PG * **Lever Ratio:** Created by the long process of the incus being shorter than the handle of the malleus (Ratio = **1.3:1**). * **Total Pressure Gain:** The combined effect of the Areal and Lever ratios provides a gain of about **22 times**, which translates to approximately **27–30 dB**. * **Catenary Lever:** This refers to the way the TM is fixed at its periphery, adding a small additional mechanical advantage (approx. 2:1). * **Clinical Correlation:** In cases of total TM perforation or ossicular discontinuity, this transformer mechanism is lost, leading to a conductive hearing loss of approximately **30 dB**.

Question 57: A flat tympanogram is seen in which of the following conditions?

A. Ankylosing Spondylitis
B. Otosclerosis (Correct Answer)
C. Serous otitis media
D. Ossicular chain disruption

Explanation: **Explanation:** A **flat tympanogram (Type B)** indicates a lack of compliance or mobility of the tympanic membrane-ossicular system. In **Otosclerosis**, the stapes footplate becomes fixed in the oval window. This increased stiffness of the ossicular chain significantly reduces the compliance of the middle ear system, resulting in a flat (Type B) or a shallow (Type As) tympanogram. While **Type As** (low peak) is the classic textbook description for early otosclerosis, advanced stapes fixation often results in a **Type B (flat)** curve due to the high impedance. **Analysis of Options:** * **Serous Otitis Media (SOM):** This also typically produces a **Type B** tympanogram due to fluid in the middle ear preventing membrane movement. However, in the context of this specific question (often a repeat from older medical exams), Otosclerosis is the prioritized answer when focusing on ossicular stiffness. * **Ossicular Chain Disruption:** This results in a **Type Ad** (deep/discontinuous) tympanogram. The lack of continuity leads to hyper-compliance (very high peak). * **Ankylosing Spondylitis:** While a systemic inflammatory condition, it is not a primary cause of middle ear pathology or specific tympanometric changes. **High-Yield Clinical Pearls for NEET-PG:** * **Type A:** Normal middle ear function. * **Type As (Stiffness):** Seen in Otosclerosis and Tympanosclerosis. * **Type Ad (Discontinuity):** Seen in Ossicular disconnection or thin, monomeric TMs. * **Type B (Flat):** Seen in Middle ear effusion (SOM), thick TM, or impacted wax. * **Type C (Negative Pressure):** Seen in Eustachian tube dysfunction (peak shifted to the left). * **Schwartz Sign:** Flamingo pink flush on the promontory (active otosclerosis). * **Carhart’s Notch:** Dip in bone conduction at 2000 Hz (classic audiometric finding in otosclerosis).

Question 58: Meniere's disease is characterized by the triad of:

A. Deafness, nystagmus, tremors
B. Deafness, vertigo, nystagmus
C. Deafness, tinnitus, vertigo (Correct Answer)
D. Deafness, tremors, tinnitus

Explanation: **Explanation:** Meniere’s disease (Endolymphatic Hydrops) is a disorder of the inner ear characterized by an abnormal accumulation of endolymph within the membranous labyrinth. The classic clinical presentation is defined by a **triad** of symptoms: 1. **Sensorineural Hearing Loss (Deafness):** Typically fluctuating and low-frequency in the early stages. 2. **Vertigo:** Episodic, spontaneous, and rotational, usually lasting 20 minutes to several hours, often accompanied by nausea and vomiting. 3. **Tinnitus:** Often described as low-pitched or "roaring" in nature. *Note: A fourth component, **Aural Fullness** (a sensation of pressure in the ear), is often included, making it a "tetrad."* **Analysis of Incorrect Options:** * **Options A, B, and D:** These are incorrect because **Tremors** are neurological signs (often cerebellar or extrapyramidal) and are not associated with inner ear pathology. While **Nystagmus** occurs during an acute attack of Meniere’s, it is a clinical *sign* of vestibular dysfunction rather than a component of the diagnostic symptomatic triad. **High-Yield Clinical Pearls for NEET-PG:** * **Pathology:** Distension of the endolymphatic system (Reissner’s membrane bulges into the scala vestibuli). * **Audiometry:** Shows **Upsloping curve** in early stages (low-frequency loss) and becomes flat in later stages. * **Recruitment Phenomenon:** Characteristically **positive** in Meniere’s (indicates cochlear pathology). * **Glycerol Test:** Used for diagnosis; dehydration of the labyrinth leads to temporary improvement in hearing. * **Management:** Low-salt diet, diuretics (Acetazolamide), and Betahistine (for maintenance). Intratympanic Gentamicin is used for chemical labyrinthectomy in refractory cases.

Question 59: Recurrent facial nerve palsy is a feature of which of the following conditions?

A. Melkersson Rosenthal syndrome (Correct Answer)
B. Simpson Golabi syndrome
C. Down's syndrome
D. Klinefelter's syndrome

Explanation: **Explanation:** **Melkersson-Rosenthal Syndrome (MRS)** is a rare neuro-mucocutaneous disorder classically defined by a diagnostic triad. The correct answer is **Option A** because **recurrent, alternating facial nerve palsy** is one of its hallmark features. The palsy is typically lower motor neuron in type and can be unilateral or bilateral. The classic triad includes: 1. **Recurrent facial paralysis:** Occurs in about 30–90% of cases. 2. **Orofacial edema:** Usually non-pitting, painless swelling of the lips (Granulomatous cheilitis or Miescher’s cheilitis). 3. **Lingua plicata:** Also known as a fissured or "scrotal" tongue (present in ~50% of cases). **Why other options are incorrect:** * **Simpson-Golabi-Behmel Syndrome:** An X-linked overgrowth disorder characterized by macrosomia, coarse facial features, and skeletal abnormalities, but not recurrent facial palsy. * **Down’s Syndrome (Trisomy 21):** While associated with a higher incidence of otitis media and narrow external auditory canals, it does not typically present with recurrent facial nerve palsy. * **Klinefelter’s Syndrome (47, XXY):** A chromosomal condition affecting males, primarily resulting in hypogonadism and infertility, with no neurological link to facial nerve paralysis. **High-Yield Clinical Pearls for NEET-PG:** * **Heerfordt’s Syndrome (Uveoparotid fever):** Another differential for facial palsy, characterized by parotid enlargement, uveitis, and fever (a manifestation of Sarcoidosis). * **Bell’s Palsy:** The most common cause of *isolated* facial palsy, but recurrence should always prompt a search for Melkersson-Rosenthal Syndrome. * **Treatment for MRS:** Primarily symptomatic; systemic corticosteroids are used to reduce the duration of paralysis and edema. Decompression of the facial nerve may be considered in frequent recurrences.

Question 60: Rinne's test is used for which of the following functions?

A. Hearing (Correct Answer)
B. Vestibular function
C. Cognitive function
D. Vision

Explanation: **Explanation:** **Rinne’s Test** is a clinical tuning fork test used to compare **Air Conduction (AC)** with **Bone Conduction (BC)** in an individual ear. It is a fundamental tool for assessing **hearing** and differentiating between conductive and sensorineural hearing loss. * **Mechanism:** A vibrating tuning fork (ideally 512 Hz) is placed on the mastoid process (BC) until the sound fades, then held near the external auditory canal (AC). * **Rinne Positive (Normal/Sensorineural Loss):** AC is better than BC (AC > BC). * **Rinne Negative (Conductive Hearing Loss):** BC is better than AC (BC > AC). **Why other options are incorrect:** * **B. Vestibular function:** This is assessed using tests like the Romberg test, Unterberger test, or Caloric testing (COWS), which evaluate balance and the inner ear's vestibular apparatus. * **C. Cognitive function:** This is evaluated using the Mini-Mental State Examination (MMSE) or Montreal Cognitive Assessment (MoCA). * **D. Vision:** This is assessed using Snellen’s charts (acuity), Ishihara plates (color), and perimetry (visual fields). **High-Yield Clinical Pearls for NEET-PG:** * **Frequency:** The **512 Hz** tuning fork is preferred because it provides a good balance between bone conduction vibration and auditory perception, with minimal "overtone" interference. * **False Negative Rinne:** Occurs in **severe unilateral sensorineural hearing loss**. The patient perceives the sound in the non-test ear via bone conduction, leading to a misleading "BC > AC" result. * **Weber Test:** Always perform Rinne alongside the Weber test to confirm the type of hearing loss (Weber lateralizes to the poorer ear in conductive loss and the better ear in sensorineural loss).

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

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free

Otology — MCQs

Otology — MCQs

On this page

Practice by Chapter

Want unlimited practice?