Diseases of the Ear Practice Questions

Q: A 7-year-old boy with severe otitis media and mastoiditis underwent surgery. Postoperatively, he developed right corner of the mouth drooping, inability to close his right eye, and food collection in his right oral vestibule. Which nerve was most likely injured during the surgery?

Facial nerve. ### Explanation **Correct Option: C. Facial Nerve** The clinical presentation describes a classic case of **Lower Motor Neuron (LMN) Facial Nerve Palsy**. The facial nerve (CN VII) has a long and tortuous course through the temporal bone, specifically within the bony Fallopian canal. During mastoid surgery (like mastoidectomy for mastoiditis), the nerve is highly vulnerable to injury, particularly in its **tympanic (horizontal)** and **mastoid (vertical)** segments. * **Inability to close the eye:** Due to paralysis of the *Orbicularis oculi*. * **Drooping of the corner of the mouth:** Due to paralysis of the *Zygomaticus* and *Risorius* muscles. * **Food collection in the vestibule:** Due to paralysis of the *Buccinator* muscle, which normally maintains cheek tension to prevent food stasis. **Why Incorrect Options are Wrong:** * **A & B (Glossopharyngeal & Vagus):** These nerves exit the skull via the jugular foramen. Injury would result in dysphagia, loss of gag reflex, or vocal cord palsy, not facial asymmetry. * **D (Maxillary nerve):** This is a sensory branch of the Trigeminal nerve (CN V2). Injury would cause mid-face anesthesia but would not affect the muscles of facial expression. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of injury:** The **horizontal segment** (just above the oval window) is the most common site of surgical trauma, especially if the bone is dehiscent. * **Second Genu:** The nerve is also at risk at the "pyramidal bend" where it turns from horizontal to vertical. * **Landmark for identification:** The **Short process of the Incus** and the **Horizontal Semicircular Canal** are the most reliable surgical landmarks to locate the facial nerve during mastoidectomy. * **Bell’s Phenomenon:** The upward and outward rolling of the eyeball when the patient attempts to close the paralyzed eyelid.

Q: What is a characteristic feature of tuberculous otitis media?

Multiple perforations in the tympanic membrane. **Explanation:** Tuberculous Otitis Media (TOM) is a chronic granulomatous infection of the middle ear, usually secondary to pulmonary tuberculosis. **Why Option A is correct:** The hallmark of TOM is the presence of **multiple "sieve-like" perforations** in the tympanic membrane. This occurs because multiple tubercles form on the drum, which then undergo caseous necrosis and break down. Over time, these small perforations may coalesce to form a single, large total perforation. **Analysis of Incorrect Options:** * **B. Mastoiditis:** While mastoid involvement occurs in TOM, it is usually characterized by extensive bone destruction and "painless" sequestration rather than the acute, painful mastoiditis seen in pyogenic infections. * **C. Middle ear effusion:** Effusion is typical of Serous Otitis Media (Eustachian tube dysfunction). TOM is characterized by pale granulation tissue and cheesy (caseous) discharge rather than simple sterile fluid. * **D. Ear discharge:** While ear discharge is present in TOM, it is not a *characteristic* feature because it is common to almost all forms of Otitis Media. In TOM, the discharge is specifically described as **painless, odorless, and watery/scanty.** **High-Yield Clinical Pearls for NEET-PG:** 1. **Classic Triad:** Painless ear discharge + Multiple perforations + Profound hearing loss (out of proportion to clinical findings). 2. **Facial Nerve Paralysis:** TOM is a common cause of facial nerve palsy in chronic ear infections. 3. **Diagnosis:** Confirmed by identifying *Mycobacterium tuberculosis* on Ziehl-Neelsen (ZN) stain or culture of the discharge/granulation tissue. 4. **Appearance:** The tympanic membrane and middle ear mucosa often appear pale and "cadaveric."

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

Antero-inferior. ### Explanation In **Acute Suppurative Otitis Media (ASOM)**, the middle ear becomes filled with purulent exudate. As the pressure from this pus increases, it leads to pressure necrosis of the tympanic membrane (TM). The **Antero-inferior quadrant** is the most common site for this perforation because it is the most vascular part of the pars tensa. Increased pressure leads to hyperemia followed by ischemia and subsequent necrosis at this specific site. **Analysis of Options:** * **Antero-inferior (Correct):** This is the classic site for perforation in ASOM. Clinically, this is also the preferred site for **Myringotomy** (specifically the postero-inferior or antero-inferior quadrants) to avoid injury to the ossicles. * **Postero-inferior:** While a common site for safe (mucosal) chronic otitis media perforations, it is not the primary site for the initial rupture in acute stages. * **Antero-superior:** This area is less commonly involved in spontaneous ruptures due to the anatomical orientation of the Eustachian tube and middle ear pressure distribution. * **Postero-superior:** This is a "danger zone." Perforations here are typically associated with **Attico-antral disease (Cholesteatoma)** rather than ASOM. Rupture here risks damage to the incudostapedial joint. **Clinical Pearls for NEET-PG:** * **Pulsatile Otorrhoea:** Known as the **"Lighthouse sign,"** it is seen when pus exudes through a small perforation in the ASOM stage of suppuration. * **Myringotomy Site:** Always performed in the **inferior quadrants** (Antero-inferior or Postero-inferior) to avoid the incus and stapes. * **Cartwheel Appearance:** Seen in the Stage of Hyperemia in ASOM due to radiating vessels over the TM.

Q: Most common site for the initiation of otosclerosis is?

Fissula ante fenestrum. **Explanation:** Otosclerosis is a primary metabolic bone disease of the otic capsule characterized by abnormal bone resorption and deposition. **1. Why Fissula Ante Fenestrum is correct:** The **fissula ante fenestrum** is a small area of vestigial embryonic cartilage located just anterior to the oval window. It is the most common site for the initiation of otosclerotic lesions (found in approximately 80-90% of cases). This area is highly susceptible to remodeling, leading to the formation of a "fossa" of spongy bone which eventually spreads to involve the stapes footplate, causing conductive hearing loss. **2. Why other options are incorrect:** * **Footplate of stapes:** While the footplate is frequently involved as the disease progresses (leading to stapedial fixation), it is usually a secondary site of involvement rather than the point of origin. * **Margins of stapes:** The disease involves the annular ligament and the margins of the oval window, but the pathological process typically starts in the otic capsule bone (fissula) and spreads toward these margins. * **Fissula post fenestrum:** This is located posterior to the oval window. While otosclerosis can occur here, it is significantly less common than involvement of the fissula ante fenestrum. **Clinical Pearls for NEET-PG:** * **Schwartze Sign:** A reddish hue seen behind the tympanic membrane due to increased vascularity in active otosclerosis (promontory). * **Carhart’s Notch:** A characteristic dip in the bone conduction threshold at **2000 Hz**. * **Gelle’s Test:** Negative (indicates stapedial fixation). * **Treatment of Choice:** Stapedotomy (most preferred) or Stapedectomy. * **Medical Management:** Sodium fluoride (used to mature active/spongy lesions).

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: 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.

Question 1

A 7-year-old boy with severe otitis media and mastoiditis underwent surgery. Postoperatively, he developed right corner of the mouth drooping, inability to close his right eye, and food collection in his right oral vestibule. Which nerve was most likely injured during the surgery?

Accepted Answer

Facial nerve

Answer

Glossopharyngeal nerve

Answer

Vagus nerve

Answer

Maxillary division of the trigeminal nerve

Question 2

What is a characteristic feature of tuberculous otitis media?

Accepted Answer

Multiple perforations in the tympanic membrane

Answer

Mastoiditis

Answer

Middle ear effusion

Answer

Ear discharge

Question 3

What is the most common perforation site in the tympanic membrane in acute suppurative otitis media?

Accepted Answer

Antero-inferior

Answer

Postero-inferior

Answer

Antero-superior

Answer

Postero-superior

Question 4

Most common site for the initiation of otosclerosis is?

Accepted Answer

Fissula ante fenestrum

Answer

Food plate of stapes

Answer

Margins of stapes

Answer

Fissula post fenestrum

Question 5

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 6

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 7

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 8

Hemorrhagic external otitis media is caused by:

Accepted Answer

Influenza

Answer

Proteus

Answer

Staphylococcus

Answer

Streptococcus

Question 9

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

Question 10

An elderly diabetic patient presents with excruciating ear pain, granulation tissue in the ear canal, and signs of skull base infection including facial paralysis. What is the recommended treatment?

Accepted Answer

Penicillin

Answer

Ciprofloxacin

Answer

Second-generation cephalosporin

Answer

Erythromycin

Diseases of the Ear — MCQs

Diseases of the Ear — MCQs

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