Diseases of the Ear Practice Questions

Q: What is the most common nerve damaged in chronic suppurative otitis media (CSOM)?

Cranial Nerve VII. **Explanation:** **Why Cranial Nerve VII (Facial Nerve) is Correct:** The facial nerve (CN VII) has a long and complex course through the temporal bone, specifically within the bony **Fallopian canal**. In cases of Chronic Suppurative Otitis Media (CSOM), particularly the **atticoantral (unsafe) type** involving cholesteatoma, the bony canal can be eroded by inflammatory enzymes (osteoclasts) and pressure necrosis. This exposes the nerve to infection and inflammation, leading to facial nerve palsy. The most common site of involvement is the **tympanic (horizontal) segment**, just above the oval window, where the bony covering is naturally thin or dehiscent. **Why the Other Options are Incorrect:** * **Cranial Nerve II (Optic Nerve):** This is a purely sensory nerve for vision and is located intraorbitally and intracranially, far from the middle ear cleft. * **Cranial Nerve III (Oculomotor Nerve):** This nerve controls extraocular muscles and is located in the cavernous sinus and midbrain. It is not anatomically related to the middle ear. * **Cranial Nerve VI (Abducens Nerve):** While CN VI can be involved in ear infections (specifically in **Gradenigo’s Syndrome** due to petrositis), it is much less common than CN VII damage. CN VI involvement presents as lateral rectus palsy. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of facial nerve dehiscence:** Tympanic segment. * **Most common complication of CSOM:** Hearing loss (Conductive); however, the Facial Nerve is the most common **cranial nerve** damaged. * **Gradenigo’s Triad:** Otorrhea, retro-orbital pain (CN V involvement), and diplopia (CN VI palsy). * **Management:** If facial palsy occurs in CSOM, it is a surgical emergency requiring urgent mastoidectomy to decompress the nerve and remove the disease.

Q: What is the most common cause of otomycosis?

Aspergillus. **Explanation:** **Otomycosis** (Otitis Externa Mycotica) is a fungal infection of the external auditory canal, typically occurring in humid climates or in patients with predisposing factors like prolonged use of antibiotic ear drops, immunocompromised states, or chronic moisture. **Why Aspergillus is correct:** * **Aspergillus niger** is the most common causative organism identified in otomycosis cases worldwide. It is characterized clinically by the presence of a black, "wet newspaper" or "sooty" appearance due to its black conidiophores. * **Aspergillus fumigatus** is the second most common species, often presenting with pale blue or green spores. **Why other options are incorrect:** * **Candida:** While *Candida albicans* is a significant cause of otomycosis (presenting as a creamy white, curd-like discharge), it is statistically less frequent than Aspergillus. It is more commonly seen in patients with underlying dermatological conditions or diabetes. * **Histoplasma & Cryptococcus:** These are systemic fungal pathogens. While they can cause disseminated disease in immunocompromised individuals, they are not primary or common causes of localized external ear infections. **Clinical Pearls for NEET-PG:** 1. **Symptoms:** Intense itching (pruritus), ear blockage, and a musty odor. 2. **Otoscopy:** Look for the "Wet Newspaper" appearance (A. niger) or "Cotton wool" appearance (Candida). 3. **Treatment:** The mainstay is meticulous **aural toilet** (cleaning) followed by topical antifungal agents like **Clotrimazole** (most common) or Nystatin. 4. **Avoidance:** Patients must be advised to keep the ear dry and stop using steroid/antibiotic drops, which promote fungal overgrowth.

Q: A 3-year-old child presents with fever and earache. On examination, there is a congested tympanic membrane with a slight bulge. What is the recommended treatment?

Antibiotics only. **Explanation:** The clinical presentation of fever, earache, and a congested, bulging tympanic membrane (TM) in a 3-year-old is diagnostic of **Acute Otitis Media (AOM)** in the **Stage of Suppuration**. 1. **Why "Antibiotics only" is correct:** The primary treatment for AOM in the suppurative stage is systemic antibiotics (typically Amoxicillin as the first line). At this stage, pus is under pressure in the middle ear, but it has not yet perforated the TM. Antibiotics effectively control the infection, resolve the inflammation, and prevent complications. In pediatric patients, medical management is the gold standard before considering surgical intervention. 2. **Why other options are incorrect:** * **Myringotomy with penicillin (A):** Myringotomy is reserved for cases with severe pain, impending complications, or failure of medical therapy. It is not the first-line treatment for uncomplicated AOM. * **Myringotomy with grommet (B):** Grommet insertion is indicated for **Otitis Media with Effusion (OME)** or recurrent AOM, not for an acute primary episode. * **Observe and wait (D):** While "watchful waiting" is an option for older children with mild, unilateral symptoms, a 3-year-old with fever and a bulging TM requires active antibiotic treatment to prevent progression to the Stage of Perforation or Mastoiditis. **High-Yield Clinical Pearls for NEET-PG:** * **Most common organism:** *Streptococcus pneumoniae* (followed by *H. influenzae* and *M. catarrhalis*). * **Stages of AOM:** Tubal occlusion → Vascular congestion → Suppuration (bulging TM) → Perforation (discharge) → Resolution. * **Myringotomy Site:** Always performed in the **postero-inferior quadrant** to avoid injury to the ossicles (incus/stapes) and the chorda tympani nerve. * **Cartwheel Appearance:** Seen in the Stage of Congestion due to radiating vessels on the TM.

Q: A 3-year-old child presents with bilateral hearing loss and, on examination, has bluish tympanic membranes. What is the most likely diagnosis?

Glue ear. **Explanation:** The correct diagnosis is **Glue Ear**, also known as **Otitis Media with Effusion (OME)**. **1. Why "Glue Ear" is correct:** Glue ear is characterized by the accumulation of non-purulent, sterile, mucoid fluid in the middle ear. In children, this is most commonly due to Eustachian tube dysfunction (often associated with adenoid hypertrophy). The **bluish or dull grey discoloration** of the tympanic membrane occurs due to the presence of thick, tenacious fluid behind the drum and the altered light reflex. Bilateral hearing loss (conductive type) in a toddler is the classic clinical presentation for this condition. **2. Why other options are incorrect:** * **Acute Serous Otitis Media:** This typically follows an upper respiratory tract infection or barotrauma. The tympanic membrane is usually retracted or shows an amber/straw-colored fluid level/bubbles, rather than a thick blue appearance. * **Acute Necrotizing Otitis Media:** This is a severe form of otitis media (often seen in measles or scarlet fever) characterized by rapid destruction of the tympanic membrane and ossicles, leading to a large central perforation, not an intact blue drum. * **Chronic Serous Otitis Media:** While OME is chronic, the term "Glue Ear" specifically describes the thick, mucoid stage that produces the classic blue/grey appearance. In NEET-PG, "Glue Ear" is the preferred clinical term for this specific presentation in children. **High-Yield Clinical Pearls for NEET-PG:** * **Investigation of Choice:** Impedance Audiometry (Tympanometry), which shows a **Type B (Flat) curve**. * **Treatment of Choice:** Myringotomy with **Grommet insertion**. * **Most common cause:** Adenoid hypertrophy (always check the nasopharynx). * **Differential for Blue Drum:** Glomus tumor (rising sun appearance), high jugular bulb, or hemotympanum (trauma).

Q: Surfer's ear differs from osteoma in that it is:

Sessile. ### Explanation The question asks to differentiate **Exostoses (Surfer’s Ear)** from **Osteomas** of the external auditory canal. The correct answer is **Sessile**. #### 1. Why "Sessile" is Correct **Exostoses (Surfer’s Ear)** are benign bony overgrowths of the external auditory canal caused by chronic exposure to cold water or wind. Pathologically, they are characterized by broad-based, **sessile** elevations of lamellar bone. In contrast, an **Osteoma** is a true benign neoplasm that typically presents as a **pedunculated** (stalked) mass. #### 2. Analysis of Incorrect Options * **A & B (Unilateral/Single):** These are features of **Osteomas**. Osteomas are typically solitary and unilateral. Exostoses (Surfer’s Ear) are almost always **bilateral and multiple**, appearing as 3 to 4 smooth mounds in the deep canal. * **D (Seen in cartilaginous canal):** Both exostoses and osteomas occur in the **bony part** of the external auditory canal, not the cartilaginous part. Exostoses specifically arise from the periosteum of the tympanic bone. #### 3. Clinical Pearls for NEET-PG | Feature | Exostoses (Surfer's Ear) | Osteoma | | :--- | :--- | :--- | | **Etiology** | Reactive (Cold water/wind) | Neoplastic (Spontaneous) | | **Number** | Multiple | Solitary | | **Laterality** | Bilateral | Unilateral | | **Shape** | Sessile (Broad-based) | Pedunculated (Stalked) | | **Location** | Deep bony canal | Bony-cartilaginous junction | * **High-Yield Fact:** Exostoses are often asymptomatic but can lead to conductive hearing loss or otitis externa if they obstruct the canal or trap debris (the "wax trap" effect). Surgery (canalplasty) is indicated only if symptomatic.

Q: What is true about Bell's palsy?

There is no role for steroids in its management.. **Explanation:** **Bell’s Palsy** is an acute, lower motor neuron (LMN) facial nerve paralysis of unknown etiology, though it is strongly linked to the reactivation of the Herpes Simplex Virus (HSV) in the geniculate ganglion. **Why the options are evaluated:** * **Option D (Correct Answer):** This option is technically **incorrect** in clinical practice, as **Corticosteroids (Prednisolone)** are the **gold standard** and mainstay of treatment. They reduce nerve edema and improve recovery rates if started within 72 hours. *Note: In the context of this specific MCQ, if "D" is marked as the correct statement by the examiner, it likely represents a factual error in the question key or a "least likely" scenario, as steroids are definitively indicated.* * **Option A:** This is a **true** statement. Bell’s palsy is the most common cause of unilateral facial paralysis worldwide (diagnosis of exclusion). * **Option B:** While mild ear pain is common, significant **tinnitus and vertigo** are characteristic of **Ramsay Hunt Syndrome** (Herpes Zoster Oticus), not typical Bell’s palsy. * **Option C:** Crocodile tears (bogorad syndrome) and synkinesis are complications of **faulty regeneration** of the nerve *after* the acute phase; they are not presenting features of the palsy itself. **Clinical Pearls for NEET-PG:** 1. **House-Brackmann Scale:** Used to grade the severity of facial nerve palsy (Grade I is normal, Grade VI is total paralysis). 2. **Schirmer’s Test:** Used to localise the lesion (at or proximal to the geniculate ganglion if lacrimation is reduced). 3. **Prognosis:** 85% of patients show signs of recovery within 3 weeks. 4. **Bell’s Phenomenon:** Upward and outward rolling of the eyeball when the patient attempts to close the eyelid (a normal protective reflex made visible by the paralysis).

Q: Exostosis due to repetitive exposure to cold water is common in which part of the temporal bone?

Tympanic part. **Explanation:** **Exostosis**, commonly known as **"Surfer’s Ear,"** refers to the formation of benign, broad-based bony outgrowths within the External Auditory Canal (EAC). This condition is a reactive response to chronic irritation, most frequently caused by repetitive exposure to cold water and wind. **Why the Tympanic Part is Correct:** The External Auditory Canal consists of an outer cartilaginous portion and an inner bony portion. The bony portion is primarily formed by the **tympanic part of the temporal bone**. When cold water enters the ear, it triggers osteoblastic activity in the periosteum of the bony canal. Because the tympanic bone forms the floor, anterior wall, and posterior-inferior wall of the bony EAC, this is where exostoses predominantly develop. They are typically bilateral, multiple, and sessile. **Why Other Options are Incorrect:** * **Squamous part:** Forms the roof (superior wall) of the bony EAC and the lateral wall of the middle ear (scutum), but it is not the primary site for cold-water-induced reactive bone growth. * **Petrous part:** This is the densest part of the temporal bone housing the inner ear structures (cochlea and vestibule). It does not form the walls of the external canal. * **Mastoid part:** While it contains the mastoid air cells and forms the posterior boundary of the bony canal, the reactive exostoses specifically arise from the tympanic ring/bone. **High-Yield Clinical Pearls for NEET-PG:** * **Exostosis vs. Osteoma:** Exostoses are usually **multiple and bilateral** (associated with cold water), whereas an Osteoma is typically **solitary, unilateral**, and arises from the tympanosquamous suture. * **Clinical Presentation:** Often asymptomatic but can lead to conductive hearing loss if they cause canal stenosis or trap cerumen/debris (leading to Otitis Externa). * **Management:** Conservative (earplugs) or surgical removal (canalplasty) if symptomatic.

Question 1

What is the most common nerve damaged in chronic suppurative otitis media (CSOM)?

Accepted Answer

Cranial Nerve VII

Answer

Cranial Nerve III

Answer

Cranial Nerve II

Answer

Cranial Nerve VI

Question 2

In a case of acute suppurative otitis media, which quadrant is typically selected for a myringotomy?

Accepted Answer

Posteroinferior

Answer

Anterosuperior

Answer

Anteroinferior

Answer

Posterosuperior

Question 3

What is the most common cause of otomycosis?

Accepted Answer

Aspergillus

Answer

Candida

Answer

Histoplasma

Answer

Cryptococcus

Question 4

A 3-year-old child presents with fever and earache. On examination, there is a congested tympanic membrane with a slight bulge. What is the recommended treatment?

Accepted Answer

Antibiotics only

Answer

Myringotomy with penicillin

Answer

Myringotomy with grommet

Answer

Observe and wait

Question 5

Malignant otitis externa is characterized by which of the following?

Accepted Answer

Granulation tissue is seen in the floor of the external auditory canal

Answer

Caused by Pseudomonas aeruginosa

Answer

Malignancy of the external auditory canal

Answer

Radiotherapy can be given

Question 6

A 3-year-old child presents with bilateral hearing loss and, on examination, has bluish tympanic membranes. What is the most likely diagnosis?

Accepted Answer

Glue ear

Answer

Acute serous otitis media

Answer

Acute necrotizing otitis media

Answer

Chronic serous otitis media

Question 7

Surfer's ear differs from osteoma in that it is:

Accepted Answer

Sessile

Answer

Unilateral

Answer

Single

Answer

Seen in cartilaginous canal

Question 8

What is true about Bell's palsy?

Accepted Answer

There is no role for steroids in its management.

Answer

It is the most common cause of facial palsy.

Answer

It is associated with tinnitus and vertigo.

Answer

It can present with crocodile tears and synkinesis.

Question 9

Exostosis due to repetitive exposure to cold water is common in which part of the temporal bone?

Accepted Answer

Tympanic part

Answer

Squamous part

Answer

Petrous part

Answer

Mastoid part

Question 10

Entry of bacteria through which space could lead to an infection in the mastoid air cells?

Accepted Answer

Nasopharyngeal tube

Answer

Cochlea

Answer

External acoustic meatus

Answer

Internal acoustic meatus

Diseases of the Ear — MCQs

Diseases of the Ear — MCQs

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