Diseases of the Ear — MCQs

An 8-year-old boy presented with a severe infection of the right middle ear. Within a week, the infection spread to the mastoid antrum and mastoid air cells. Despite antibiotic treatment, the organisms did not respond, leading the surgeon to perform a radical mastoid operation. Postoperatively, the boy's face became distorted: his mouth was drawn upward to the left, and he was unable to close his right eye. Saliva accumulated in his right cheek and dribbled from the corner of his mouth. What structure was most likely damaged during the operation?

Diseases of the Ear Indian Medical PG Practice Questions and MCQs

Question 141: A blue tympanic membrane is indicative of which of the following conditions?

A. Serous otitis media (Correct Answer)
B. Chronic suppurative otitis media
C. Tympanic membrane perforation
D. None of the above

Explanation: ### Explanation The appearance of a **blue tympanic membrane (TM)** is a classic clinical sign in ENT, typically resulting from the presence of fluid or blood behind an intact membrane. **1. Why Serous Otitis Media (SOM) is correct:** In Serous Otitis Media (also known as Otitis Media with Effusion), the eustachian tube dysfunction leads to negative middle ear pressure and the accumulation of sterile, non-purulent fluid. While the TM often appears amber or straw-colored, in chronic or long-standing cases, the fluid can become thick and dark, or there may be associated mucosal vascular changes. This gives the TM a characteristic **dull, bluish, or slate-gray hue**. **2. Why other options are incorrect:** * **Chronic Suppurative Otitis Media (CSOM):** This condition is characterized by a **permanent perforation** of the TM and active discharge. A blue TM requires an intact membrane to reflect the color of the contents within the middle ear. * **Tympanic Membrane Perforation:** A perforated membrane allows direct visualization of the middle ear mucosa (which is usually pink/red) or reveals a dark "hole," but does not present as a solid blue membrane. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Differential Diagnosis of Blue TM:** * **Hemotympanum:** Blood in the middle ear (common after longitudinal temporal bone fractures or barotrauma). * **Glomus Tumor (Glomus Jugulare/Tympanicum):** Presents as a "rising sun" appearance; a red-blue fleshy mass behind the TM. * **High Riding Jugular Bulb:** A vascular anomaly where the jugular bulb extends into the middle ear. * **Cholesteatoma (rarely):** If associated with significant hemorrhage or specific biochemical changes. * **SOM Key Findings:** Retracted TM, restricted mobility on pneumatic otoscopy, and a **Type B (flat) tympanogram**. * **Management of SOM:** Myringotomy with Grommet insertion is the treatment of choice for persistent cases.

Question 142: All of the following are true about Meniere's disease except:

A. Triad of recurrent vertigo, fluctuating sensorineural hearing loss, and tinnitus are found.
B. Treatment consists of the use of thiazides.
C. Drop attacks can occur.
D. Onset only occurs after 50 years of age. (Correct Answer)

Explanation: **Explanation:** Meniere’s disease (Endolymphatic Hydrops) is characterized by an abnormal accumulation of endolymph within the inner ear, leading to distension of the membranous labyrinth. **Why Option D is the Correct Answer (The False Statement):** Meniere’s disease typically manifests in adults between **20 and 50 years of age**. While it can occur in older populations, the statement that it "only occurs after 50" is clinically incorrect. There is no gender predilection, and it is usually unilateral initially, though it can become bilateral in 25-50% of cases. **Analysis of Other Options:** * **Option A:** This describes the **classic clinical triad**. The hearing loss is characteristically a **fluctuating, low-frequency sensorineural hearing loss (SNHL)**. Tinnitus is often described as "roaring" or "seashell" in nature. * **Option B:** Medical management focuses on reducing endolymphatic pressure. **Thiazide diuretics** (e.g., Chlorthalidone) and a low-salt diet are mainstay treatments to prevent fluid retention. * **Option C:** **Tumarkin’s Otolithic Crisis** (drop attacks) occurs in advanced stages due to sudden mechanical deformation of the utricle and saccule, causing a sudden loss of postural tone without loss of consciousness. **High-Yield Clinical Pearls for NEET-PG:** * **Lermoyez Phenomenon:** A variant where hearing improves during a vertigo attack ("reverse Meniere’s"). * **Glycerol Test:** Used for diagnosis; oral glycerol (osmotic diuretic) temporarily improves hearing thresholds. * **Audiometry:** Shows a "rising curve" in early stages (low-frequency loss) and a "flat curve" in late stages. * **Recruitment Phenomenon:** Positive (indicates cochlear pathology). * **Surgical Management:** Endolymphatic sac decompression (conservative) or Labyrinthectomy (destructive).

Question 143: The glycerol test is used for the diagnosis of which condition?

A. Meniere's disease (Correct Answer)
B. Otosclerosis
C. Acute suppurative otitis media
D. Malignant otitis externa

Explanation: **Explanation:** The **Glycerol Test** is a diagnostic tool used specifically for **Meniere’s disease** (Endolymphatic Hydrops). The underlying pathophysiology of Meniere’s is an accumulation of endolymph within the inner ear. Glycerol is an osmotic diuretic; when administered orally, it increases the osmolality of the blood, creating an osmotic gradient that draws excess fluid out of the endolymphatic space. A "positive" test is indicated if there is a significant improvement in hearing (at least 10 dB improvement in two or more frequencies or a 10% improvement in speech discrimination scores) 2–3 hours after ingestion. This confirms the presence of reversible endolymphatic hydrops. **Analysis of Incorrect Options:** * **Otosclerosis:** This is a metabolic bone disease of the otic capsule causing stapes fixation. Diagnosis is primarily via pure tone audiometry (Carhart’s notch) and tympanometry (As type curve). * **Acute Suppurative Otitis Media (ASOM):** This is a bacterial infection of the middle ear. Diagnosis is clinical, based on otoscopic findings of a bulging, congested tympanic membrane. * **Malignant Otitis Externa:** This is a severe necrotizing infection of the external ear canal (usually *Pseudomonas* in diabetics). Diagnosis relies on clinical presentation, CT/MRI for bone erosion, and Technetium-99m or Gallium-67 scans. **NEET-PG High-Yield Pearls:** * **Electrocochleography (ECoG):** The most sensitive objective test for Meniere’s; look for an increased **SP/AP ratio (>0.3)**. * **Caloric Test:** Shows **canal paresis** on the affected side in 75% of Meniere's cases. * **Lermoyez Syndrome:** A variant of Meniere’s where hearing *improves* during a vertigo attack. * **Burnout Phenomenon:** Late-stage Meniere’s where vertigo ceases but hearing loss becomes permanent and profound.

Question 144: What is the commonest cause for grommet insertion?

A. Secretory otitis media (Correct Answer)
B. Otosclerosis
C. Chronic suppurative otitis media (CSOM)
D. Cholesteatoma

Explanation: **Explanation:** **1. Why Secretory Otitis Media (SOM) is correct:** Secretory Otitis Media (also known as Otitis Media with Effusion - OME) is characterized by the accumulation of non-purulent fluid in the middle ear cleft. The primary pathophysiology involves **Eustachian tube dysfunction**, leading to negative middle ear pressure. A **Grommet (Myringotomy with Ventilation Tube)** is the surgical treatment of choice when medical management fails. It serves two purposes: it provides an alternative route for ventilation of the middle ear and allows for the continuous drainage of fluid, thereby restoring hearing and preventing complications like retraction pockets. **2. Why other options are incorrect:** * **Otosclerosis:** This is a disease of the bony labyrinth causing stapes fixation. The treatment is primarily medical (Sodium Fluoride), surgical (**Stapedotomy/Stapedectomy**), or hearing aids. Grommets have no role here as there is no fluid or pressure issue. * **CSOM:** Chronic Suppurative Otitis Media involves a permanent perforation of the TM. Since the drum is already open, a grommet is redundant. Treatment involves **Tympanoplasty** or **Mastoidectomy**. * **Cholesteatoma:** This is a destructive keratinizing squamous epithelium in the middle ear. It requires surgical excision via **Mastoidectomy** to prevent intracranial complications. **Clinical Pearls for NEET-PG:** * **Most common site for Myringotomy:** Postero-inferior quadrant (to avoid injury to the ossicles and chorda tympani). * **Indications for Grommet:** Recurrent SOM (>3 months), Reversion of retraction pockets, and Barotrauma. * **Commonest complication of Grommet:** Otorrhoea; long-term complication includes Tympanosclerosis. * **Hearing loss in SOM:** Usually a Conductive Hearing Loss of 20-40 dB; the audiogram shows a **Type B (Flat) Tympanogram**.

Question 145: Which of the following is false regarding Gradenigo's syndrome?

A. Retrobulbar pain
B. Otitis media
C. Facial palsy (Correct Answer)
D. Petrositis

Explanation: **Explanation** Gradenigo’s syndrome is a classic clinical triad resulting from **Petrositis** (inflammation of the petrous apex), typically occurring as a complication of chronic or acute suppurative otitis media. **Why "Facial palsy" is the correct answer (The False Statement):** The classic Gradenigo’s triad consists of: 1. **Abducens nerve (VI) palsy:** Leading to diplopia and lateral rectus paralysis. 2. **Retrobulbar/Trigeminal pain:** Due to involvement of the Trigeminal (V) ganglion (Gasserian ganglion) in Meckel’s cave. 3. **Otorrhea:** Resulting from the underlying Otitis Media. While the facial nerve (VII) passes through the temporal bone, it is **not** part of the defining triad of Gradenigo’s syndrome. Facial palsy may occur in advanced temporal bone infections, but it is not a diagnostic component of this specific syndrome. **Analysis of Incorrect Options:** * **Petrositis (D) & Otitis media (B):** These are the primary pathological drivers. Infection spreads from the middle ear/mastoid air cells to the petrous apex via cell tracts. * **Retrobulbar pain (A):** This is a hallmark symptom caused by irritation of the ophthalmic division of the Trigeminal nerve near the petrous tip. **NEET-PG High-Yield Pearls:** * **Anatomical Landmark:** The VI nerve and V nerve are involved because they pass near the petrous apex in **Dorello’s Canal**. * **Investigation of Choice:** **Contrast-enhanced MRI** is superior for visualizing petrous apex lesions, though CT shows bone destruction. * **Treatment:** Aggressive intravenous antibiotics and surgical drainage (e.g., cortical mastoidectomy with petrous apicectomy).

Question 146: A 23-year-old patient presents with a 7-8 day history of fever, chills, and headache. The patient also reports intermittent purulent ear discharge and retro-orbital pain. On examination, mild ptosis is noted. What is the likely diagnosis?

A. Gradenigo's syndrome (Correct Answer)
B. Gressinger's syndrome
C. Styloid syndrome
D. Peritonsilar abscess

Explanation: ### Explanation **Gradenigo’s Syndrome** is a classic complication of apical petrositis (infection of the petrous apex of the temporal bone), usually arising from chronic suppurative otitis media (CSOM). The diagnosis is based on the **Gradenigo’s Triad**: 1. **Persistent Ear Discharge:** Evidence of middle ear infection/petrositis. 2. **Retro-orbital Pain:** Due to irritation of the **Trigeminal nerve (CN V)** ganglion (Gasserian ganglion) in Meckel’s cave. 3. **Abducens Nerve Palsy (CN VI):** Occurs as the nerve passes through Dorello’s canal. This leads to diplopia and lateral rectus weakness. *Note:* While the triad specifies CN VI palsy, associated inflammation can occasionally involve the sympathetic plexus around the carotid, leading to **mild ptosis** (Horner’s syndrome features), as seen in this clinical vignette. #### Why the other options are incorrect: * **Gressinger’s Syndrome:** Refers to edema over the mastoid process due to thrombosis of the mastoid emissary vein, a sign of **Lateral Sinus Thrombosis**. * **Styloid Syndrome (Eagle’s Syndrome):** Characterized by an elongated styloid process causing recurrent throat pain, dysphagia, and facial pain, typically following a tonsillectomy. It does not present with fever or ear discharge. * **Peritonsillar Abscess (Quinsy):** A complication of tonsillitis presenting with "hot potato" voice, trismus, and uvular deviation. It does not cause retro-orbital pain or cranial nerve palsies. #### High-Yield Clinical Pearls for NEET-PG: * **Dorello’s Canal:** The anatomical site where the 6th cranial nerve is compressed in petrositis. * **Investigation of Choice:** Contrast-enhanced CT (CECT) or MRI of the temporal bone to visualize petrous apex opacification. * **Management:** High-dose intravenous antibiotics and surgical drainage (Petrosectomy) if medical management fails.

Question 147: Which of the following is NOT a typical feature of malignant otitis externa?

A. Caused by Pseudomonas aeruginosa
B. Patients are usually elderly
C. Mitotic figures are high (Correct Answer)
D. Patient is immunocompromised

Explanation: **Malignant Otitis Externa (MOE)**, also known as Necrotizing Otitis Externa, is a severe, life-threatening infection of the external auditory canal that spreads to the skull base (osteomyelitis). ### **Explanation of the Correct Answer** **Option C (Mitotic figures are high)** is the correct answer because it is **NOT** a feature of MOE. High mitotic figures are a hallmark of **malignancy (cancer)**. Despite its name, "Malignant" Otitis Externa is an **infectious/inflammatory process**, not a neoplastic one. While it behaves "malignantly" by invading bone and surrounding tissues, a biopsy would show inflammatory cells and granulation tissue, not cancerous cells or increased mitosis. ### **Analysis of Incorrect Options** * **Option A:** **Pseudomonas aeruginosa** is the causative organism in more than 95% of cases. It produces exotoxins that cause tissue necrosis and vasculitis. * **Option B & D:** MOE characteristically affects **elderly patients** (usually >60 years) who are **immunocompromised**, most commonly due to poorly controlled **Diabetes Mellitus**. The microangiopathy of diabetes impairs perfusion, facilitating the spread of infection. ### **Clinical Pearls for NEET-PG** * **Pathognomonic Sign:** Presence of **granulation tissue** at the junction of the cartilaginous and bony part of the external auditory canal. * **Earliest Cranial Nerve Involved:** Facial nerve (VII), followed by IX, X, and XI as it spreads to the jugular foramen. * **Diagnosis:** **Technetium-99m scan** is the most sensitive for initial diagnosis (detects osteoblastic activity). * **Monitoring:** **Gallium-67 scan** or **Indium-111 labeled WBC scan** is used to monitor response to treatment and confirm resolution (as Technetium remains positive for months). * **Treatment:** Long-term IV antipseudomonal antibiotics (e.g., Ciprofloxacin, Ceftazidime) and strict glycemic control.

Question 148: Which of the following organisms does NOT cause otitis externa?

A. Escherichia coli
B. Candida albicans
C. Streptococcus pyogenes (Correct Answer)
D. Staphylococcus aureus

Explanation: **Explanation:** Otitis externa (OE) is an inflammation of the external auditory canal, typically caused by a breach in the skin-cerumen barrier. The correct answer is **Streptococcus pyogenes** because it is primarily associated with infections of the middle ear (Acute Otitis Media) and the throat, rather than the external ear canal. **Why the other options are incorrect:** * **Staphylococcus aureus:** This is one of the most common bacterial causes of localized otitis externa (furunculosis), infecting the hair follicles in the outer cartilaginous part of the canal. * **Escherichia coli:** Gram-negative bacilli like *E. coli*, *Proteus*, and *Klebsiella* are frequently isolated in diffuse otitis externa, often due to contaminated water exposure or chronic moisture. * **Candida albicans:** This is a common fungal pathogen causing **Otomycosis**. It typically presents with a "wet newspaper" appearance (white sebaceous debris) and is common in humid climates or after prolonged antibiotic use. **Clinical Pearls for NEET-PG:** 1. **Most Common Cause:** *Pseudomonas aeruginosa* is the most common overall cause of diffuse otitis externa (Swimmer’s ear). 2. **Malignant Otitis Externa:** This is a life-threatening extension of OE into the skull base, seen in diabetics/immunocompromised patients, almost exclusively caused by *Pseudomonas*. 3. **Otomycosis:** Aside from *Candida*, *Aspergillus niger* is a high-yield pathogen, characterized by black "conidiophores" (black-headed filamentous growth). 4. **Furunculosis:** Always remember that furuncles occur only in the **outer 1/3rd** of the canal because that is the only site containing hair follicles.

Question 149: Which of the following is NOT an extracranial complication of chronic suppurative otitis media?

A. Citelli abscess
B. Bezold abscess
C. Perisinus abscess (Correct Answer)
D. Lüch-type abscess

Explanation: **Explanation:** Complications of Chronic Suppurative Otitis Media (CSOM) are broadly classified into two categories: **Intracranial** (within the cranial cavity) and **Extracranial** (outside the cranial cavity). **Why Perisinus Abscess is the correct answer:** A **Perisinus abscess** is an **intracranial complication**. It occurs when pus collects between the dural wall of the lateral sinus (sigmoid sinus) and the overlying mastoid bone. Since it involves the space within the skull and is often a precursor to lateral sinus thrombophlebitis, it is categorized as intracranial. **Analysis of Incorrect Options (Extracranial Complications):** * **Bezold’s Abscess:** A neck abscess formed when pus breaks through the thin inner table of the mastoid tip, tracking down into the **sternocleidomastoid muscle** sheath. * **Citelli’s Abscess:** Occurs when pus tracks through the mastoid tip or digastric fossa, following the posterior belly of the **digastric muscle** to the digastric triangle. * **Luc’s Abscess:** A subperiosteal abscess of the **external auditory canal** wall, resulting from pus tracking through the notch of Rivinus or a defect in the meatal bone. **High-Yield Clinical Pearls for NEET-PG:** * **Most common intracranial complication:** Meningitis (though some texts cite Extradural abscess). * **Most common extracranial complication:** Mastoiditis. * **Griesinger’s Sign:** Edema over the mastoid bone due to thrombosis of the mastoid emissary vein (seen in lateral sinus thrombosis). * **Zygomatic Abscess:** Pus tracks into the root of the zygoma, causing swelling in front of and above the pinna.

Question 150: An 8-year-old boy presented with a severe infection of the right middle ear. Within a week, the infection spread to the mastoid antrum and mastoid air cells. Despite antibiotic treatment, the organisms did not respond, leading the surgeon to perform a radical mastoid operation. Postoperatively, the boy's face became distorted: his mouth was drawn upward to the left, and he was unable to close his right eye. Saliva accumulated in his right cheek and dribbled from the corner of his mouth. What structure was most likely damaged during the operation?

A. Mandibular nerve
B. Parotid duct
C. Vagus nerve
D. Facial nerve (Correct Answer)

Explanation: ### Explanation **1. Why the Correct Answer is Right:** The patient is presenting with classic signs of **Lower Motor Neuron (LMN) Facial Nerve (CN VII) Palsy**. The facial nerve has a long and tortuous course through the temporal bone, specifically within the **Fallopian canal**. During a radical mastoidectomy, the nerve is highly vulnerable to injury, particularly in its **tympanic (horizontal)** and **mastoid (vertical)** segments. * **Clinical Correlation:** The inability to close the right eye (paralysis of *orbicularis oculi*), the mouth being drawn to the healthy (left) side due to unopposed muscle action, and the accumulation of saliva/food in the cheek (paralysis of *buccinator*) are hallmark signs of facial nerve damage. **2. Why the Incorrect Options are Wrong:** * **A. Mandibular Nerve (V3):** This nerve supplies the muscles of mastication. While it controls jaw movement, it does not control facial expression or eye closure. * **B. Parotid Duct:** Injury to the Stensen’s duct would lead to a salivary fistula or swelling, but it would not cause motor paralysis of the facial muscles. * **C. Vagus Nerve (X):** Damage to the vagus nerve would result in dysphagia, hoarseness (vocal cord paralysis), or loss of the gag reflex, none of which are present here. **3. NEET-PG High-Yield Pearls:** * **Most common site of facial nerve injury** during mastoid surgery is the **second genu**, just distal to the horizontal semicircular canal. * **Dehiscence of the Fallopian canal** (most common in the tympanic segment) increases the risk of nerve injury during middle ear surgery. * **Bell’s Phenomenon:** The upward and outward rolling of the eyeball when the patient attempts to close the eyelid (seen in LMN facial palsy). * **House-Brackmann Scale:** Used to grade the severity of facial nerve paralysis (Grade I is normal; Grade VI is total paralysis).

Practice by Chapter

Otitis Externa

Practice Questions

Acute Otitis Media

Practice Questions

Chronic Otitis Media

Practice Questions

Complications of Otitis Media

Practice Questions

Otosclerosis

Practice Questions

Presbycusis

Practice Questions

Sudden Sensorineural Hearing Loss

Practice Questions

Noise-Induced Hearing Loss

Practice Questions

Ménière's Disease

Practice Questions

Benign Paroxysmal Positional Vertigo

Practice Questions

Vestibular Neuritis

Practice Questions

Tumors of the Ear and Temporal Bone

Practice Questions

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