Diseases of the Ear Practice Questions

Q: What is the most common cause of lower motor neuron facial palsy?

Bell's palsy. **Explanation:** **1. Why Bell’s Palsy is Correct:** Bell’s palsy is an idiopathic, acute-onset lower motor neuron (LMN) facial nerve paralysis. It is the **most common cause** of isolated facial palsy worldwide, accounting for approximately 60–75% of all cases. Pathophysiologically, it is believed to be caused by viral-induced (often HSV-1) inflammation and edema of the facial nerve within the narrow fallopian canal, leading to nerve compression and ischemia. **2. Analysis of Incorrect Options:** * **A. Cholesteatoma:** While a common cause of facial nerve palsy in patients with Chronic Suppurative Otitis Media (CSOM), it is far less frequent than Bell's palsy. It causes palsy via direct pressure or inflammatory erosion of the bony canal. * **B. Cerebello-pontine (CP) angle tumors:** Tumors like Acoustic Neuroma (Vestibular Schwannoma) can cause LMN facial palsy, but they typically present with associated symptoms like sensorineural hearing loss and tinnitus. They are a much rarer cause than idiopathic palsy. * **C. Postoperative (ear surgery):** Iatrogenic injury is a significant concern during mastoidectomy or stapedectomy, but with modern surgical techniques and monitoring, it remains a complication rather than the leading cause in the general population. **3. Clinical Pearls for NEET-PG:** * **Diagnosis of Exclusion:** Bell’s palsy is diagnosed only after excluding middle ear pathology, trauma, and tumors. * **House-Brackmann Scale:** Used to grade the severity of facial nerve palsy (Grade I is normal; Grade VI is total paralysis). * **Management:** The mainstay of treatment is **Oral Corticosteroids** (e.g., Prednisolone), which should ideally be started within 72 hours of onset. Antivirals (Acyclovir) may be added in severe cases. * **Topognostic Tests:** Schirmer’s test, Stapedial reflex, and Taste sensation help localize the site of the lesion along the nerve's course.

Q: What is the most common benign tumor of the middle ear?

Glomus tumor. **Explanation:** The **Glomus tumor** (also known as Paraganglioma) is the most common benign tumor of the middle ear and the second most common tumor of the temporal bone (after acoustic neuroma). These are highly vascular, slow-growing tumors arising from the paraganglia. In the middle ear, they typically present as **Glomus Tympanicum** (arising from the promontory along Jacobson’s nerve) or **Glomus Jugulare** (arising from the jugular bulb and invading the floor of the middle ear). **Analysis of Options:** * **Adenoid cystic carcinoma (A):** This is a rare, slow-growing but highly invasive **malignant** tumor, more commonly associated with salivary glands or the external auditory canal, not the middle ear. * **Squamous cell carcinoma (B):** This is the most common **malignant** tumor of the middle ear, often associated with chronic suppurative otitis media (CSOM), but it is not benign. * **Acoustic neuroma (D):** Also known as Vestibular Schwannoma, this is the most common benign tumor of the **internal auditory canal/Cerebellopontine (CP) angle**, not the middle ear. **Clinical Pearls for NEET-PG:** * **Classic Presentation:** Pulsatile tinnitus (synchronous with pulse) and conductive hearing loss. * **Otoscopy:** A "Rising Sun" appearance (red/blue mass behind an intact tympanic membrane). * **Phelps Sign:** Loss of the bony plate between the jugular bulb and the middle ear (seen on CT). * **Brown’s Sign:** Pulsations of the tumor cease when the ear canal pressure is raised above systolic pressure using a Siegle’s speculum. * **Aquino’s Sign:** Blanching of the mass upon carotid artery compression.

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).

Question 1

What is the treatment for traumatic rupture of the tympanic membrane?

Accepted Answer

No active treatment

Answer

Aural packing

Answer

Chloromycetin ear drops

Answer

Tympanoplasty

Question 2

Which of the following statements is NOT true regarding the development and reconstruction of the pinna?

Accepted Answer

Reconstruction of the pinna in anotia is optimally performed within 1 year of age.

Answer

The pinna develops from the first pharyngeal arch hillocks of His.

Answer

The tragus is formed from the first pharyngeal arch hillock.

Answer

Costal cartilage is used as a graft in the surgical treatment of anotia.

Question 3

What is the most common cause of lower motor neuron facial palsy?

Accepted Answer

Bell's palsy

Answer

Cholesteatoma

Answer

Cerebello-pontine angle tumors

Answer

Postoperative (ear surgery)

Question 4

What is the most common benign tumor of the middle ear?

Accepted Answer

Glomus tumor

Answer

Adenoid cystic carcinoma

Answer

Squamous cell carcinoma

Answer

Acoustic neuroma

Question 5

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 6

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 7

What is the most common cause of otomycosis?

Accepted Answer

Aspergillus

Answer

Candida

Answer

Histoplasma

Answer

Cryptococcus

Question 8

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 9

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 10

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

Diseases of the Ear — MCQs

Diseases of the Ear — MCQs

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