Diseases of the Ear Practice Questions

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.

Q: Selective low frequency sensorineural hearing loss occurs in which condition?

Meniere's disease. **Explanation:** **Meniere’s Disease (Endolymphatic Hydrops)** is characterized by an accumulation of endolymph within the inner ear. In the early stages, the increased pressure primarily affects the **apex of the cochlea**, where the basilar membrane is wider and more compliant. Since the apex is responsible for detecting low-frequency sounds, patients typically present with a **fluctuating, low-frequency sensorineural hearing loss (SNHL)**. This is a classic "rising" configuration on an audiogram. **Analysis of Incorrect Options:** * **BPPV:** This is a peripheral vestibular disorder caused by canalolithiasis (usually in the posterior semicircular canal). It causes episodic vertigo triggered by head movements but **does not involve hearing loss**. * **Glomus Tumour:** These are vascular tumors of the middle ear. They typically present with **pulsatile tinnitus** and **conductive hearing loss** (due to mass effect on the ossicles), rather than selective low-frequency SNHL. * **Schwannoma (Acoustic Neuroma):** This tumor of the 8th cranial nerve typically presents with **unilateral, high-frequency SNHL** and poor speech discrimination, as the tumor compresses the vestibular and cochlear nerve fibers. **High-Yield Clinical Pearls for NEET-PG:** * **Meniere’s Tetrad:** Episodic vertigo, fluctuating SNHL, tinnitus, and a sensation of aural fullness. * **Lermoyez Phenomenon:** A variant of Meniere’s where hearing *improves* during a vertigo attack. * **Burn-out Stage:** In late-stage Meniere’s, the hearing loss may become permanent and involve all frequencies (flat audiogram). * **Glycerol Test:** Used for diagnosis; it acts as an osmotic diuretic to temporarily reduce endolymphatic pressure and improve hearing.

Q: What is true about cholesteatoma?

It erodes the bone.. **Explanation:** **Cholesteatoma** is a non-neoplastic, keratinizing squamous epithelium-lined sac found within the middle ear or mastoid. Despite its name, it is neither a tumor nor primarily composed of cholesterol. **1. Why the Correct Answer is Right:** The hallmark of cholesteatoma is its ability to **erode bone**. This occurs through two primary mechanisms: * **Enzymatic Activity:** It produces osteolytic enzymes (such as Collagenase, Acid phosphatase, and Protease) and cytokines (TNF-α, IL-1) that activate osteoclasts. * **Pressure Necrosis:** As the keratin debris accumulates, the expanding sac exerts physical pressure on the surrounding bony structures (ossicles, otic capsule, and mastoid). **2. Analysis of Incorrect Options:** * **Option A:** While not a malignancy, calling it "benign" is clinically misleading. It is often described as **"locally invasive"** or "bone-destroying" because it can cause life-threatening complications (e.g., meningitis, brain abscess). * **Option B:** It is an epithelial cyst, not a cancer; therefore, it **does not metastasize** to lymph nodes or distant organs. * **Option C:** The name is a misnomer. It consists of **keratin debris**, not cholesterol. Cholesterol granuloma is a separate entity. **3. NEET-PG High-Yield Pearls:** * **Microscopic appearance:** Keratinizing stratified squamous epithelium with a "shiny white" or "pearly" appearance. * **Earliest bone eroded:** The **Long process of the Incus** (most common) or the **Scutum**. * **Theories of Origin:** Wittmaack’s (Retraction pocket), Habermann’s (Migration), and Sade’s (Metaplasia). * **Complications:** Can lead to a **Fistula of the Lateral Semicircular Canal** (most common canal involved) and Facial nerve palsy.

Q: What is true about Acute Necrotizing Otitis Media (ANOM)?

The most common organism is β-Hemolytic streptococci.. **Explanation:** **Acute Necrotizing Otitis Media (ANOM)** is a virulent form of acute otitis media characterized by rapid destruction of the tympanic membrane and middle ear structures. 1. **Why Option B is Correct:** The classic causative organism for ANOM is **$\beta$-Hemolytic streptococci**. While other organisms like *Staphylococcus aureus* or *Streptococcus pneumoniae* can be involved, $\beta$-Hemolytic streptococci are historically and clinically recognized as the most common and aggressive pathogens in this specific necrotizing variant. 2. **Why Other Options are Incorrect:** * **Option A:** *Pseudomonas aeruginosa* is the primary pathogen in **Malignant Otitis Externa** (seen in elderly diabetics) and Chronic Suppurative Otitis Media (CSOM), but not typically in ANOM. * **Option C:** While it can occur in debilitated patients, ANOM is classically associated with **children suffering from exanthematous fevers** (e.g., Measles, Scarlet fever, or Influenza). It is the severity of the specific infection rather than generalized "low immunity" that defines its presentation. * **Option D:** ANOM typically results in a **large central perforation** (often described as a "total" or "subtotal" perforation) due to the sloughing of the tympanic membrane. Marginal perforations are more characteristic of Attico-antral (unsafe) CSOM. **High-Yield Clinical Pearls for NEET-PG:** * **Pathology:** Rapid necrosis leads to the formation of a large central perforation and can result in permanent hearing loss due to ossicular destruction (especially the incus). * **Healing:** The perforation rarely heals spontaneously; it often heals by secondary intention, leading to a thin, atrophic membrane or permanent defect. * **Key Association:** Always link ANOM with **Measles** in exam questions.

Q: Painless discharge from the ear and multiple tympanic membrane perforations are characteristic of which condition?

Tuberculous otitis media. **Explanation:** **Tuberculous Otitis Media (TOM)** is the correct answer because it presents with a classic clinical triad: **painless ear discharge**, **multiple tympanic membrane (TM) perforations**, and profound hearing loss disproportionate to the symptoms. The infection usually reaches the middle ear via the Eustachian tube (secondary to pulmonary TB) or hematogenous spread. The multiple perforations occur due to the coalescence of multiple small tubercles on the TM; these eventually merge into a single large central perforation. **Analysis of Incorrect Options:** * **Fungal Otitis Media (Otomycosis):** Characteristically presents with intense itching, pain, and a "wet newspaper" or "cotton wool" appearance (Aspergillus/Candida). It does not typically cause multiple TM perforations. * **Serous Otitis Media (Otitis Media with Effusion):** Characterized by a retracted, dull TM with air-fluid levels or bubbles. The TM remains **intact**, and there is no discharge. * **Viral Otitis Media:** Often presents as Myringitis Bullosa, characterized by severe pain and hemorrhagic blebs on the TM. It does not cause chronic painless discharge or multiple perforations. **High-Yield Clinical Pearls for NEET-PG:** * **Pathognomonic sign:** Multiple "sieve-like" perforations (though these often coalesce into one large perforation later). * **Discharge:** Characteristically thin, odorless, and watery (flocculent). * **Facial Nerve Paralysis:** A known complication of TOM due to bone necrosis. * **Diagnosis:** Confirmed by identifying *Mycobacterium tuberculosis* in the discharge (AFB staining) or via middle ear mucosa biopsy showing granulomas.

Q: What is the most common cause of conductive hearing loss with an intact tympanic membrane?

Otitis media with effusion (Glue ear). **Explanation:** The correct answer is **Otitis media with effusion (OME)**, also known as "Glue ear." **1. Why it is the correct answer:** Conductive hearing loss (CHL) occurs when sound cannot be efficiently conducted through the outer or middle ear. In OME, the middle ear space is filled with non-purulent fluid instead of air. This fluid increases the impedance of the ossicular chain, leading to CHL. Crucially, in OME, the **tympanic membrane remains intact**, though it may appear dull, retracted, or show an air-fluid level/bubbles. It is the most common cause of CHL in children and a frequent cause in adults following upper respiratory infections. **2. Why the other options are incorrect:** * **Presbycusis (A):** This is age-related hearing loss. It is a **Sensorineural Hearing Loss (SNHL)**, not conductive, caused by the degeneration of hair cells in the cochlea. * **Meniere's disease (B):** This is an inner ear disorder characterized by endolymphatic hydrops. It presents with a triad of vertigo, tinnitus, and fluctuating **SNHL** (typically low-frequency). * **Acoustic neuroma (D):** Also known as vestibular schwannoma, this is a benign tumor of the 8th cranial nerve. It causes retrocochlear **SNHL**, not conductive loss. **3. Clinical Pearls for NEET-PG:** * **Otosclerosis:** Another common cause of CHL with an intact TM (especially in young adults). It is characterized by a "flamingo flush" (Schwartz sign) and **Carhart’s notch** at 2000 Hz on audiometry. * **Tympanometry:** In OME, the tympanogram shows a **Type B (flat) curve**, whereas Otosclerosis shows a **Type As (shallow)** curve. * **Management of OME:** Most cases resolve spontaneously; if persistent, myringotomy with grommet insertion is the treatment of choice.

Question 1

Which of the following is true about cholesteatoma (atticoantral)?

Accepted Answer

Scanty, malodorous discharge

Answer

Otaliga

Answer

Central perforation

Answer

Ossicular involvement

Question 2

A 38-year-old male presented with a suspected diagnosis of suppurative labyrinthitis. An initial examination revealed a positive Rinne's test and a positive fistula test. The patient refused treatment and returned to the emergency department after 2 weeks complaining of deafness in the affected ear. On re-examination, the fistula test was observed to be negative. What is the likely expected finding on repeating the Rinne's test?

Accepted Answer

False Negative Rinne's Test

Answer

True Positive Rinne's Test

Answer

False Positive Rinne's Test

Answer

True Negative Rinne's Test

Question 3

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

Question 4

Selective low frequency sensorineural hearing loss occurs in which condition?

Accepted Answer

Meniere's disease

Answer

Benign Paroxysmal Positional Vertigo (BPPV)

Answer

Glomus tumour

Answer

Schwannoma

Question 5

What is true about cholesteatoma?

Accepted Answer

It erodes the bone.

Answer

It is a benign condition.

Answer

It metastasizes to lymph nodes.

Answer

It contains cholesterol.

Question 6

Cauliflower ear is typically seen in which of the following conditions?

Accepted Answer

Post-traumatic cases

Answer

Pseudomonas infection

Answer

Aspergillus infection

Answer

Tuberculosis

Question 7

What is true about Acute Necrotizing Otitis Media (ANOM)?

Accepted Answer

The most common organism is β-Hemolytic streptococci.

Answer

The most common organism is Pseudomonas Aeruginosa.

Answer

It occurs in patients with low immunity.

Answer

It causes marginal perforation.

Question 8

Painless discharge from the ear and multiple tympanic membrane perforations are characteristic of which condition?

Accepted Answer

Tuberculous otitis media

Answer

Fungal otitis media

Answer

Serous otitis media

Answer

Viral otitis media

Question 9

What is the most common cause of conductive hearing loss with an intact tympanic membrane?

Accepted Answer

Otitis media with effusion (Glue ear)

Answer

Presbycusis

Answer

Meniere's disease

Answer

Acoustic neuroma

Question 10

Which of the following statement regarding Eustachian tube dysfunction is wrong?

Accepted Answer

Undistorted light image on the anterior quadrant of tympanic membrane

Answer

No movement of the tympanic membrane on siegel's method

Answer

Malleus is easily visible

Answer

Lusterless tympanic membrane

Diseases of the Ear — MCQs

Diseases of the Ear — MCQs

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