Otology — MCQs

Otology Indian Medical PG Practice Questions and MCQs

Question 271: All of the following are true regarding foreign body impaction in the ear, except:

A. Objects located medial to the isthmus of the ear canal are difficult to remove.
B. Syringing is used for the removal of vegetative foreign bodies. (Correct Answer)
C. Syringing uses room temperature water.
D. A blunt hook is used to remove rounded foreign bodies.

Explanation: ### Explanation **1. Why Option B is the Correct Answer (The Exception):** Vegetative foreign bodies (e.g., seeds, beans, peas) are **hygroscopic** in nature. If syringing is attempted, these objects absorb water, swell in size, and become more tightly impacted within the external auditory canal. This leads to increased pain, potential infection, and makes subsequent removal significantly more difficult. Therefore, syringing is strictly **contraindicated** for vegetative foreign bodies. **2. Analysis of Other Options:** * **Option A:** The **isthmus** is the narrowest part of the external auditory canal (at the junction of the cartilaginous and bony parts). Objects pushed medial to the isthmus become trapped in the wider bony canal, making instrumentation difficult and increasing the risk of tympanic membrane injury. * **Option C:** Syringing should ideally be performed with water at **body temperature (37°C)**. Using water that is too cold or too hot can induce the **caloric reflex**, leading to vertigo, nystagmus, and nausea. While "room temperature" is technically incorrect in a strict clinical sense, in the context of this MCQ, Option B is the "most" incorrect/absolute contraindication. * **Option D:** For smooth, rounded objects (like beads), forceps should be avoided as they may slip and push the object deeper. A **blunt hook** or Jobson-Horne probe is passed behind the object to pull it forward. **3. Clinical Pearls for NEET-PG:** * **Living Foreign Bodies:** Always kill insects before removal using **oil (olive/coconut), spirit, or lignocaine** to prevent trauma from movement. * **Button Batteries:** These are surgical emergencies. Do **not** use any liquid (syringing/drops) as it causes leakage of electrolytes and severe liquefactive necrosis. * **Syringing Technique:** The water jet should be directed towards the **posterosuperior wall** of the canal, not directly at the object or the drum.

Question 272: Which graft material is commonly used for myringoplasty?

A. Temporalis fascia (Correct Answer)
B. Iliacus fascia
C. Colles fascia
D. Iliotibial band

Explanation: **Explanation:** **Temporalis fascia** is the gold standard and most commonly used graft material for myringoplasty (Type 1 Tympanoplasty). Its popularity stems from several anatomical and physiological advantages: 1. **Anatomical Proximity:** It is available within the same surgical field (post-aural or endaural incision). 2. **Low Metabolic Rate:** It has a low oxygen requirement, ensuring a high "take" rate (over 90%). 3. **Structural Similarity:** Its thickness and elastic properties closely mimic the middle fibrous layer of the tympanic membrane. 4. **Ease of Handling:** It is easy to harvest, thin, and can be easily manipulated to fit the perforation. **Analysis of Incorrect Options:** * **Iliacus fascia & Colles fascia:** These are not used in otological surgery. They are located in the pelvic and perineal regions, respectively, making them surgically inaccessible and functionally unsuitable for middle ear reconstruction. * **Iliotibial band (Fascia Lata):** While it was used historically for large perforations or total reconstructions, it is much thicker than temporalis fascia. It requires a separate donor site incision (thigh), increasing morbidity. **High-Yield Clinical Pearls for NEET-PG:** * **Other common grafts:** Tragal perichondrium (preferred for revision cases or attic retractions), cartilage (used for "shield grafts" in atelectatic ears), and fat (used for small, central "plug" myringoplasties). * **Wullstein’s Classification:** Myringoplasty is technically a **Type 1 Tympanoplasty**, where the repair is limited to the tympanic membrane with a normal ossicular chain. * **Positioning:** Temporalis fascia is most commonly placed using the **underlay technique** (medial to the handle of the malleus and the fibrous annulus).

Question 273: Which of the following is NOT a characteristic feature of otosclerosis?

A. Conductive deafness
B. Positive Rinne's test (Correct Answer)
C. Paracusis willisii
D. Mobile ear drum

Explanation: ### Explanation **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 involves the **stapes footplate**, leading to its fixation. **Why "Positive Rinne's test" is the correct answer:** A **Positive Rinne’s test** (Air Conduction > Bone Conduction) is a feature of normal hearing or sensorineural hearing loss. Since otosclerosis causes stapes fixation, it results in **Conductive Hearing Loss (CHL)**. In CHL, the Rinne’s test becomes **Negative** (Bone Conduction > Air Conduction). Therefore, a positive Rinne is not a characteristic of this condition. **Analysis of other options:** * **Conductive deafness:** This is the hallmark of otosclerosis. The fixation of the stapes footplate prevents the efficient transmission of sound vibrations from the ossicular chain to the oval window. * **Paracusis Willisii:** This is a classic clinical feature where a patient with conductive hearing loss hears better in noisy surroundings. This occurs because background noise causes normal-hearing people to speak louder, which the patient perceives clearly above the filtered-out low-frequency noise. * **Mobile ear drum:** In otosclerosis, the pathology is limited to the ossicles (specifically the stapes). The tympanic membrane remains normal, healthy, and fully mobile on pneumatic otoscopy. **High-Yield Clinical Pearls for NEET-PG:** * **Schwartze Sign (Flamingo Flush):** A reddish hue seen through the TM due to increased vascularity over the promontory (active phase). * **Carhart’s Notch:** A characteristic dip in the bone conduction threshold at **2000 Hz**. * **Gelle’s Test:** Negative (indicates stapes fixation). * **Tympanometry:** Typically shows an **As type** curve (stiffened system). * **Treatment of choice:** Stapedotomy or Stapedectomy.

Question 274: The Politzer bag maneuver is used to test which anatomical structure?

A. Eustachian tube (Correct Answer)
B. Larynx
C. Esophagus
D. Nasal cavity

Explanation: **Explanation:** The **Politzer bag maneuver** (Politzerization) is a clinical procedure used to assess and improve the patency of the **Eustachian tube**. It involves the physician compressing a rubber bulb (Politzer bag) into one nostril while the patient swallows or says "K-K-K" (to elevate the soft palate and seal the nasopharynx). This action forces air into the nasopharynx and through the Eustachian tube into the middle ear, equalizing pressure. * **Why Eustachian Tube is correct:** The primary function of the Eustachian tube is to ventilate the middle ear and equalize atmospheric pressure. If the tube is blocked (e.g., in Eustachian tube dysfunction or serous otitis media), the Politzer maneuver helps re-establish patency and clear middle ear effusions. * **Why other options are incorrect:** * **Larynx:** Evaluated via laryngoscopy; the Politzer bag does not deliver air to the glottis. * **Esophagus:** Evaluated via endoscopy or barium swallow; it is a digestive tract structure. * **Nasal cavity:** While the bag is placed in the nostril, the *test* is designed to evaluate the pressure transmission to the ear, not the nasal anatomy itself. **High-Yield NEET-PG Pearls:** * **Valsalva Maneuver:** Forced expiration against a closed glottis (patient-led) to test Eustachian tube patency. * **Toynbee Maneuver:** Swallowing with the nose pinched (more physiological than Valsalva). * **Siegle’s Speculum:** Used for pneumatic otoscopy to check tympanic membrane mobility. * **Clinical Indication:** Politzerization is often used in children with **Otitis Media with Effusion (OME)** who cannot perform the Valsalva maneuver.

Question 275: What is the most common site of tympanic membrane perforation in acute suppurative otitis media?

A. Anterior superior quadrant
B. Anterior inferior quadrant (Correct Answer)
C. Posterior superior quadrant
D. Posterior inferior quadrant

Explanation: **Explanation:** In **Acute Suppurative Otitis Media (ASOM)**, the accumulation of inflammatory exudate (pus) within the middle ear cavity leads to increased pressure against the tympanic membrane (TM). This pressure causes ischemia and subsequent necrosis of the membrane, leading to a spontaneous perforation. **Why the Anterior Inferior Quadrant is correct:** The **Anterior Inferior (AI) quadrant** is the most common site for perforation in ASOM because it is the most dependent part of the tympanic membrane when a patient is in an upright or semi-recumbent position. Additionally, this area has a relatively poorer blood supply compared to the posterior quadrants, making it more susceptible to pressure-induced necrosis. **Analysis of Incorrect Options:** * **Anterior Superior (AS) Quadrant:** This area is closer to the Eustachian tube orifice but is not the primary site for pressure-induced necrosis in ASOM. * **Posterior Superior (PS) Quadrant:** This is a dangerous site for perforations. Perforations here are more commonly associated with **cholesteatoma** or retraction pockets (Attico-antral disease) rather than acute infections. * **Posterior Inferior (PI) Quadrant:** While perforations can occur here, it is statistically less common than the AI quadrant. However, the PI quadrant is the **preferred site for Myringotomy** because it is away from the ossicles and the Eustachian tube. **Clinical Pearls for NEET-PG:** * **Myringotomy Site:** Always performed in the **Postero-inferior quadrant** to avoid injury to the incudostapedial joint (PS) and the Eustachian tube (Anterior). * **Light Reflex:** Normally seen in the **Antero-inferior quadrant**. * **ASOM Stages:** Perforation occurs during the **Stage of Suppuration**, leading to the **Stage of Resolution** (pulsatile "Ferris wheel" discharge).

Question 276: The outer layer of the pars tensa is lined by which of the following types of epithelium?

A. Simple cuboidal epithelium
B. Ciliated columnar epithelium
C. Stratified squamous epithelium (Correct Answer)
D. Keratinized squamous epithelium

Explanation: The tympanic membrane (pars tensa) is a trilaminar structure, meaning it consists of three distinct layers. Understanding these layers is fundamental for NEET-PG Otology: 1. **Outer Layer (Cuticular layer):** This layer is continuous with the skin of the external auditory canal. It is composed of **stratified squamous epithelium**. 2. **Middle Layer (Fibrous layer):** Contains outer radial and inner circular fibers that provide structural integrity. 3. **Inner Layer (Mucosal layer):** Continuous with the lining of the middle ear cleft. ### Why the other options are incorrect: * **Simple cuboidal/Ciliated columnar epithelium (Options A & B):** These represent the respiratory-type lining found in the **inner mucosal layer** of the tympanic membrane and the middle ear cavity, not the outer layer. * **Keratinized squamous epithelium (Option D):** While the outer layer is stratified squamous, it is generally considered non-keratinized or minimally keratinized under normal physiological conditions. However, the presence of keratin in the middle ear is a hallmark of **Cholesteatoma**. ### High-Yield Clinical Pearls for NEET-PG: * **Pars Tensa vs. Pars Flaccida:** The Pars Flaccida (Shrapnell’s membrane) lacks the organized fibrous middle layer (specifically the annulus), making it more prone to retraction. * **Nerve Supply:** The outer surface is supplied by the Auriculotemporal nerve (CN V3) and the Auricular branch of the Vagus (Arnold’s nerve). The inner surface is supplied by the Tympanic branch of the Glossopharyngeal nerve (Jacobson’s nerve). * **Cone of Light:** Always points towards the **anterior-inferior** quadrant in a healthy ear.

Question 277: Mastoid reservoir phenomenon is positive in which of the following conditions?

A. Chronic suppurative otitis media (CSOM)
B. Petrositis
C. Coalescent otitis media
D. Coalescent mastoiditis (Correct Answer)

Explanation: **Explanation:** **Mastoid Reservoir Phenomenon** is a classic clinical sign of **Coalescent Mastoiditis**. It occurs when the mastoid air cells break down (coalescence) and form a large, pus-filled cavity. When the ear is mopped dry, the external auditory canal rapidly refills with pus from the mastoid reservoir through a perforation in the tympanic membrane. This happens because the volume of pus in the mastoid cavity is significantly larger than what the middle ear can hold. **Analysis of Options:** * **Coalescent Mastoiditis (Correct):** The destruction of bony septa creates a large "reservoir" of pus. The rapid re-accumulation of discharge after cleaning is pathognomonic for this condition. * **CSOM (Incorrect):** While CSOM presents with ear discharge, the discharge is usually persistent or intermittent but does not typically exhibit the rapid "refilling" characteristic of a large bony reservoir unless complicated by mastoiditis. * **Petrositis (Incorrect):** This involves the petrous apex. While it presents with Gradenigo’s triad (otorrhea, retro-orbital pain, and 6th nerve palsy), it does not specifically produce the reservoir sign. * **Coalescent Otitis Media (Incorrect):** This is a distractor term. "Coalescence" specifically refers to the breakdown of bony trabeculae in the mastoid, not the middle ear itself. **High-Yield Clinical Pearls for NEET-PG:** * **Sagging of the posterosuperior meatal wall:** Another hallmark sign of coalescent mastoiditis due to periostitis. * **Ironed-out appearance:** Loss of the retroauricular sulcus due to edema over the mastoid. * **Radiology:** X-ray Schuller’s view or CT Temporal bone shows "clouding" of air cells and loss of bony septa (coalescence). * **Treatment:** Intravenous antibiotics; if failing, **Cortical Mastoidectomy** (Schwartze operation) is the surgery of choice.

Question 278: Which of the following is true about Glomus-jugulare tumors?

A. Most common in males
B. Arises from non-chromaffin cells
C. Lymph node metastasis is seen (Correct Answer)
D. Multicentric origin

Explanation: **Explanation:** Glomus jugulare (Paraganglioma) is a benign but locally aggressive tumor arising from the paraganglia located in the adventitia of the jugular bulb. **1. Why Option C is Correct:** While Glomus tumors are generally considered benign, they are "locally invasive." Approximately **2–5% of cases** can exhibit malignancy. The hallmark of malignancy in paragangliomas is not cellular atypia, but rather the presence of **lymph node metastasis** or distant spread (most commonly to the lungs or liver). **2. Analysis of Incorrect Options:** * **Option A:** Glomus tumors are significantly **more common in females** (ratio approx. 4:1 to 6:1), typically presenting in the 4th–6th decades of life. * **Option B:** They arise from **non-chromaffin cells** (paraganglion cells) derived from the neural crest. These cells do not stain with chromium salts, unlike the chromaffin cells of the adrenal medulla. * **Option D:** While **multicentricity** can occur (especially in familial cases associated with SDH mutations), it is seen in only about **10% of sporadic cases**. In contrast, lymph node metastasis is a definitive pathological characteristic used to define malignancy in these tumors. **High-Yield Clinical Pearls for NEET-PG:** * **Pulsatile Tinnitus:** The most common presenting symptom (bruit heard by the patient). * **Brown’s Sign:** Pulsation seen on otoscopy that ceases with positive pressure using a Siegle’s speculum. * **Aquino’s Sign:** Blanching of the mass on carotid artery compression. * **Phelps’ Sign:** Loss of the bony crest between the carotid canal and jugular foramen on CT. * **Salt and Pepper Appearance:** Classic MRI finding (T2 sequence) due to high vascularity (flow voids). * **Treatment of Choice:** Surgical excision; preoperative embolization is often used to reduce vascularity.

Question 279: CSOM with Picket fence fever is seen in which of the following conditions?

A. Meningitis
B. Sigmoid Sinus Thrombosis (Correct Answer)
C. Brain Abscess
D. Extradural Abscess

Explanation: **Explanation:** **Sigmoid Sinus Thrombosis (SST)** is a common intracranial complication of Chronic Suppurative Otitis Media (CSOM), particularly the squamosal type. The characteristic clinical feature is **"Picket Fence Fever"** (also known as Hectic Tremor). This occurs due to the periodic release of septic emboli into the systemic circulation from the infected thrombus within the sigmoid sinus. The fever is characterized by high-grade spikes (often with chills and rigors) followed by a rapid return to normal or subnormal levels, resembling the sharp peaks of a picket fence. **Analysis of Incorrect Options:** * **Meningitis:** Presents with high-grade continuous fever, neck rigidity, and positive Kernig’s/Brudzinski’s signs. It does not show the "hectic" spikes seen in SST. * **Brain Abscess:** Typically presents with features of raised intracranial pressure (headache, vomiting, papilledema) and focal neurological deficits. The fever is often low-grade or even absent in the latent stage. * **Extradural Abscess:** Often clinically silent and discovered per-operatively. If symptomatic, it presents with persistent earache and pulsatile discharge, but not systemic septic fever. **High-Yield Clinical Pearls for NEET-PG:** * **Griesinger’s Sign:** Edema over the mastoid process due to thrombosis of the mastoid emissary vein (Pathognomonic for SST). * **Tobey-Ayer Test:** Used to detect SST during manometry; compression of the internal jugular vein on the affected side shows no rise in CSF pressure. * **Crowe-Beck Test:** Engorgement of retinal veins on compressing the jugular vein of the healthy side. * **Investigation of Choice:** Contrast-enhanced MRI (MR Venogram) showing the **"Empty Delta Sign."**

Question 280: What is true in case of perforation of the pars flaccida?

A. Chronic suppurative otitis media is a rare cause.
B. It is associated with cholesteatoma. (Correct Answer)
C. It is usually due to trauma.
D. All of the above.

Explanation: **Explanation:** Perforations of the tympanic membrane are clinically divided based on their location: **Pars Tensa** (associated with mucosal disease) and **Pars Flaccida** (associated with squamosal disease). **1. Why Option B is Correct:** The pars flaccida (Shrapnell’s membrane) lacks a robust fibrous middle layer (the *annulus tympanicus* is absent here). This makes it more prone to retraction when there is negative middle ear pressure. A retraction pocket in the pars flaccida is the most common site for the development of **Primary Acquired Cholesteatoma**. As keratin debris accumulates within this pocket, it forms a cholesteatoma, which can erode the scutum and the ossicles (specifically the head of the malleus and body of the incus). **2. Why other options are incorrect:** * **Option A:** Chronic Suppurative Otitis Media (CSOM) is actually the **primary cause** of pars flaccida perforations. Specifically, the "Attico-antral" or "Unsafe" type of CSOM is characterized by disease in the attic/pars flaccida region. * **Option C:** Traumatic perforations (due to a slap, water sports, or instrumentation) almost exclusively involve the **pars tensa**, as it constitutes the largest surface area of the drum. Pars flaccida perforations are nearly always pathological (inflammatory/cholesteatomatous) rather than traumatic. **Clinical Pearls for NEET-PG:** * **Safe vs. Unsafe:** Pars tensa perforations (Central) are "Safe" (low risk of bone erosion); Pars flaccida/Marginal perforations are "Unsafe" (high risk of cholesteatoma). * **Prussak’s Space:** This is the most common initial site for cholesteatoma formation, located lateral to the neck of the malleus and medial to the pars flaccida. * **Management:** Unlike central perforations which may be managed medically, pars flaccida disease usually requires surgical intervention (Mastoidectomy).

Practice by Chapter

Tympanic Membrane Perforation

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Cholesteatoma

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Tympanoplasty Techniques

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Ossicular Chain Reconstruction

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Mastoidectomy

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Stapedectomy

Practice Questions

Implantable Hearing Devices

Practice Questions

Congenital Aural Atresia

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Otologic Trauma

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Glomus Tumors

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Facial Nerve Decompression

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Rehabilitative Audiology

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Otology — MCQs

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