Diseases of the Ear Practice Questions

Q: The lighthouse sign is characteristic of which stage of inflammation?

Stage of suppuration. **Explanation:** The **Lighthouse Sign** is a classic clinical finding in **Acute Suppurative Otitis Media (ASOM)**. It occurs during the **Stage of Suppuration**, where the pressure of accumulated pus in the middle ear leads to a small pinpoint perforation in the pars tensa of the tympanic membrane. Due to the high pressure and the presence of hyperemic (congested) mucosa, the discharge is seen pulsating through this perforation. The rhythmic reflection of light off the pulsating discharge mimics the revolving light of a lighthouse. **Analysis of Options:** * **Stage of Suppuration (Correct):** This stage is defined by the formation of pus under tension and the subsequent rupture of the tympanic membrane. Pulsatile ear discharge is the hallmark of this stage. * **Stage of Hyperemia:** This is the earliest stage characterized by congestion of the pars flaccida and handle of the malleus (cartwheel appearance). There is no perforation or discharge yet. * **Stage of Pre-suppuration:** Characterized by the formation of inflammatory exudate and a bulging, angry-red tympanic membrane. The membrane is still intact, so no "lighthouse" effect can occur. * **Stage of Resolution:** In this stage, the infection subsides, the perforation heals, and the tympanic membrane returns to normal. **Clinical Pearls for NEET-PG:** * **Cartwheel appearance:** Seen in the Stage of Hyperemia. * **Bulging TM (Donut sign):** Seen in the Stage of Pre-suppuration. * **Treatment of choice for Stage of Suppuration:** Systemic antibiotics and ear toilet. If the membrane is bulging and painful (Pre-suppuration), a **Myringotomy** is indicated to relieve pressure and prevent a jagged spontaneous rupture.

Q: Edema over the mastoid is seen in which condition?

Lateral sinus thrombophlebitis. **Explanation:** The correct answer is **Lateral sinus thrombophlebitis**. Edema over the mastoid process in this condition is known as **Griesinger's sign**. **1. Why Lateral Sinus Thrombophlebitis is correct:** Lateral (Sigmoid) sinus thrombophlebitis is a serious intracranial complication of middle ear infections. The sigmoid sinus drains into the internal jugular vein. When a thrombus forms, it can lead to retrograde congestion of the **mastoid emissary vein**, which connects the sigmoid sinus to the extracranial venous system. This congestion results in edema and tenderness over the posterior part of the mastoid bone (Griesinger's sign). **2. Why the other options are incorrect:** * **Bell’s Palsy:** This is an idiopathic lower motor neuron facial nerve palsy. It presents with facial drooping but does not involve venous congestion or mastoid edema. * **CSOM/ASOM:** While these are the underlying infections that *lead* to complications, uncomplicated CSOM or ASOM typically presents with ear discharge or pain. Mastoid edema only occurs if they progress to **Mastoiditis** (edema in the post-auricular sulcus) or **Lateral Sinus Thrombophlebitis** (edema over the mastoid bone). **3. High-Yield Clinical Pearls for NEET-PG:** * **Griesinger’s Sign:** Edema over the mastoid due to mastoid emissary vein thrombosis. * **Picket-fence Fever:** The characteristic hectic, spiking fever seen in lateral sinus thrombophlebitis. * **Tobey-Ayer Test / Queckenstedt’s Test:** Used to detect lateral sinus obstruction by measuring CSF pressure during jugular vein compression. * **Delta Sign:** Seen on contrast-enhanced CT, representing a thrombus in the sigmoid sinus. * **Greisinger's vs. Mastoiditis:** In Mastoiditis, the edema is usually more anterior, causing the pinna to be displaced "downwards and forwards."

Q: An 18-year-old boy experiences recurrent episodes of otitis externa after swimming. Which of the following preventive measures should be recommended?

Use 2% acetic acid after swimming. **Explanation:** **1. Why Option B is Correct:** Otitis externa (Swimmer’s ear) is often triggered by the retention of moisture in the external auditory canal (EAC), which leads to the maceration of skin and an increase in the local pH. The normal EAC is slightly acidic, which acts as a natural defense mechanism against bacterial (e.g., *Pseudomonas*) and fungal growth. **2% Acetic acid** (or aluminum acetate) acts as an acidifying agent. Applying it after swimming restores the acidic environment of the canal, inhibits microbial proliferation, and helps dry the canal, making it the most effective preventive measure. **2. Why Other Options are Incorrect:** * **Option A:** While avoiding swimming prevents exposure, it is an impractical lifestyle restriction for a recurring issue that can be managed medically. * **Option C:** Antibiotic-steroid drops are the mainstay for **treating** active acute otitis externa. However, they are not recommended for long-term prophylaxis as they can lead to the development of resistant organisms or secondary fungal infections (Otomycosis). * **Option D:** Antifungal drops are used to treat Otomycosis. They do not address the primary pathophysiology of "swimmer's ear," which is usually bacterial or inflammatory due to moisture. **3. Clinical Pearls for NEET-PG:** * **Most common pathogen:** *Pseudomonas aeruginosa* is the most common cause of bacterial otitis externa. * **Pathophysiology:** Loss of protective cerumen + moisture + alkaline pH = Bacterial overgrowth. * **Prophylaxis:** Aside from acidifying drops, patients should be advised to use well-fitting earplugs or dry the ears using a hairdryer on a "cool" setting. * **Tragal tenderness:** This is the hallmark clinical sign of Otitis Externa, distinguishing it from Otitis Media.

Q: A 22-year-old man presents with itching, earache, and watery discharge with a musty odor from his ear. Examination reveals a black-headed filamentous growth resembling wet blotting paper. What is the likely diagnosis?

Otomycosis by Aspergillus niger. ### Explanation **Correct Answer: B. Otomycosis by Aspergillus niger** **1. Why it is correct:** The clinical presentation is classic for **Otomycosis**, a fungal infection of the external auditory canal. The diagnosis is confirmed by the specific morphology of the fungal growth. * **Aspergillus niger** is characterized by **black-headed filamentous growth** (conidiophores) that gives the appearance of **"wet blotting paper"** or a "newspaper print" appearance in the ear canal. * The symptoms of intense itching (pruritus), earache, and a watery discharge with a **musty odor** are hallmark features of this fungal colonization. **2. Why other options are incorrect:** * **A. Acute Otitis externa:** This is typically a bacterial infection (often *Pseudomonas*). While it causes pain and discharge, it presents with diffuse canal edema and exquisite tenderness on tragal pressure, without the characteristic filamentous fungal debris. * **C. Aspergillus fumigatus:** While a common cause of otomycosis, it typically presents with **pale blue or greenish** fungal growth rather than black. * **D. Candida:** *Candida albicans* presents as a **white, creamy, or curd-like** discharge (resembling oral thrush) rather than filamentous black heads. **3. NEET-PG High-Yield Pearls:** * **Predisposing factors:** Hot/humid climates, prolonged use of topical antibiotic ear drops (which alters canal flora), and immunocompromised states. * **Key Pathogens:** *Aspergillus niger* (Black), *Aspergillus fumigatus* (Green/Blue), *Aspergillus flavus* (Yellow), and *Candida* (White). * **Treatment:** Thorough **aural toilet** (cleaning) followed by topical antifungal agents like **Clotrimazole** (most common) or Nystatin. Acetic acid drops can be used to restore the acidic pH of the canal. * **Classic Description:** Always look for the keywords "Wet blotting paper" or "Musty odor" to identify Otomycosis in exams.

Q: Direction of water jet while doing syringing of ear should be:

Posterosuperior. **Explanation:** The primary objective of ear syringing is to remove wax or a foreign body using the **"piston effect"** of water pressure. **Why Posterosuperior is Correct:** The external auditory canal (EAC) is not a straight tube; it has a natural curvature. By directing the water jet toward the **posterosuperior wall** of the canal, the water travels along the roof, reaches the tympanic membrane, and reflects back behind the wax bolus. This builds up pressure behind the obstruction, pushing it outward (the "piston effect"). This direction also follows the natural anatomy of the canal when the pinna is pulled upwards and backwards (in adults), minimizing the risk of direct trauma to the tympanic membrane. **Why Other Options are Incorrect:** * **Anteroinferior/Anterosuperior:** The anterior part of the canal has a "recess" (the anterior sulcus) near the drum. Directing water here can trap the wax further or cause the water to strike the drum directly, increasing the risk of perforation or pain. * **Posteroinferior:** This direction is less efficient at creating the necessary back-pressure and may simply push the wax deeper into the bony portion of the canal. **High-Yield Clinical Pearls for NEET-PG:** * **Temperature:** Water must be at **body temperature (37°C)**. If it is too cold or too hot, it induces the **caloric reflex**, leading to vertigo and nystagmus. * **Contraindications:** Never syringe if there is a history of **tympanic membrane perforation**, previous ear surgery, or an organic foreign body (like a seed) that might swell. * **Complications:** The most common complication is **injury to the EAC skin**, followed by tympanic membrane perforation and otitis externa.

Q: Hemorrhagic external otitis media is caused by:

Influenza. ### Explanation **Hemorrhagic External Otitis (Otitis Externa Hemorrhagica)**, also known as **Bullous Myringitis**, is a specific viral infection characterized by the formation of blood-filled vesicles (bullae) on the tympanic membrane and the deep external auditory canal. **Why Influenza is Correct:** The primary causative agent is the **Influenza virus** (most commonly associated with epidemics). The condition often follows an upper respiratory tract infection. The virus causes localized inflammation and serosanguinous fluid accumulation between the layers of the tympanic membrane, leading to severe, throbbing ear pain (otalgia) that subsides once the bullae rupture. **Why Other Options are Incorrect:** * **B, C, and D (Proteus, Staphylococcus, Streptococcus):** These are common **bacterial** pathogens. While they cause typical Acute Otitis Media (AOM) or Otitis Externa (Swimmer's ear), they typically present with purulent (pus-forming) discharge and diffuse inflammation rather than the classic hemorrhagic bullae seen in viral infections. *Staphylococcus aureus* is the most common cause of furunculosis (localized otitis externa), while *Proteus* is often associated with chronic suppurative otitis media (CSOM). **NEET-PG High-Yield Pearls:** * **Clinical Presentation:** Sudden onset of excruciating pain followed by serosanguinous (bloody) ear discharge upon bulla rupture. * **Key Finding:** Hemorrhagic bullae on the tympanic membrane. * **Management:** Treatment is primarily symptomatic (analgesics). Antibiotics are only indicated if a secondary bacterial infection is suspected. * **Differential Diagnosis:** Always rule out **ASOM (Acute Suppurative Otitis Media)**; however, in bullous myringitis, the hearing loss is usually minimal unless the middle ear is also involved. * **Associated Finding:** Occasionally associated with sensorineural hearing loss (SNHL) or facial palsy if the virus affects the inner ear or cranial nerves.

Q: What is the alternative name for the pars flaccida of the tympanic membrane?

Shrapnel's membrane. ### Explanation The tympanic membrane is divided into two distinct anatomical parts: the **Pars Tensa** and the **Pars Flaccida**. **Why the correct answer is right:** * **Pars Flaccida (Shrapnel’s Membrane):** This is the small, triangular, superior portion of the tympanic membrane located above the anterior and posterior malleolar folds (in the Notch of Rivinus). Unlike the pars tensa, it lacks a well-developed middle fibrous layer (lamina propria), making it "flaccid." It is named after **Henry Jones Shrapnell**, who first described it. **Analysis of Incorrect Options:** * **A. Reissner's Membrane:** Also known as the vestibular membrane, it is a thin layer inside the cochlea that separates the Scala Media from the Scala Vestibuli. * **C. Basilar Membrane:** A structural element within the cochlea that separates the Scala Media from the Scala Tympani and supports the Organ of Corti. * **D. Secondary Tympanic Membrane:** This is the membrane that covers the **round window** (fenestra rotunda), separating the middle ear from the Scala Tympani of the inner ear. **High-Yield Clinical Pearls for NEET-PG:** 1. **Layers:** The Pars Flaccida lacks the organized circular and radial fibrous layers found in the Pars Tensa. 2. **Cholesteatoma:** The Pars Flaccida is the most common site for the formation of **retraction pockets**, which are the precursors to primary acquired cholesteatoma. 3. **Prussak’s Space:** This is a small recess located medial to the Pars Flaccida; it is the initial site of cholesteatoma development in most cases. 4. **Blood Supply:** It is more vascular than the pars tensa, which is why it may appear slightly pinker during otoscopy.

Question 1

The lighthouse sign is characteristic of which stage of inflammation?

Accepted Answer

Stage of suppuration

Answer

Stage of hyperemia

Answer

Stage of resolution

Answer

Stage of pre-suppuration

Question 2

Edema over the mastoid is seen in which condition?

Accepted Answer

Lateral sinus thrombophlebitis

Answer

Bell's Palsy

Answer

Chronic suppurative otitis media (CSOM)

Answer

Acute suppurative otitis media (ASOM)

Question 3

Otic barotrauma results due to -

Accepted Answer

Descent in air

Answer

Ascent in air

Answer

Linear acceleration

Answer

Sudden acceleration

Question 4

An 18-year-old boy experiences recurrent episodes of otitis externa after swimming. Which of the following preventive measures should be recommended?

Accepted Answer

Use 2% acetic acid after swimming

Answer

Avoid swimming

Answer

Use ear drops containing an antibiotic and steroid

Answer

Use antifungal ear drops after swimming

Question 5

A 22-year-old man presents with itching, earache, and watery discharge with a musty odor from his ear. Examination reveals a black-headed filamentous growth resembling wet blotting paper. What is the likely diagnosis?

Accepted Answer

Otomycosis by Aspergillus niger

Answer

Acute Otitis externa

Answer

Otomycosis by Aspergillus fumigatus

Answer

Otomycosis by Candida

Question 6

Direction of water jet while doing syringing of ear should be:

Accepted Answer

Posterosuperior

Answer

Anteroinferior

Answer

Anterosuperior

Answer

Posteroinferior

Question 7

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

Accepted Answer

Syringing is used for the removal of vegetative foreign bodies.

Answer

Objects located medial to the isthmus of the ear canal are difficult to remove.

Answer

Syringing uses room temperature water.

Answer

A blunt hook is used to remove rounded foreign bodies.

Question 8

Hemorrhagic external otitis media is caused by:

Accepted Answer

Influenza

Answer

Proteus

Answer

Staphylococcus

Answer

Streptococcus

Question 9

What is the alternative name for the pars flaccida of the tympanic membrane?

Accepted Answer

Shrapnel's membrane

Answer

Reissner's membrane

Answer

Basilar membrane

Answer

Secondary tympanic membrane

Question 10

A child presents with barotrauma pain. There is no inflammation of the middle ear. What is the appropriate management?

Accepted Answer

Suppurative management

Answer

Antibiotics

Answer

Paracetamol

Answer

Grommet tube insertion

Diseases of the Ear — MCQs

Diseases of the Ear — MCQs

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