Diseases of the Ear Practice Questions

Q: What is the consequence of prolonged blockade of the Eustachian tube?

All of the above. ### Explanation The Eustachian tube (ET) is essential for middle ear ventilation, protection, and drainage. Prolonged blockade leads to a sequence of pathological changes known as **Eustachian Tube Dysfunction (ETD)**. **1. Why "All of the above" is correct:** The underlying mechanism is the development of **negative middle ear pressure**. According to Boyle’s Law, when the ET fails to open, oxygen in the middle ear is absorbed by the mucosal vessels, creating a vacuum. * **Atelectatic Ear:** The negative pressure causes the tympanic membrane (TM) to be sucked inward (retraction). Over time, the fibrous layer of the TM weakens, leading to a collapsed or "atelectatic" ear. * **Cholesteatoma:** Prolonged retraction (especially in the pars flaccida) creates a **retraction pocket**. As keratin debris accumulates within this pocket and cannot be cleared, it forms a primary acquired cholesteatoma. * **Perforation:** Chronic negative pressure and recurrent inflammation (Otitis Media with Effusion) can lead to atrophy of the TM. This thinned membrane is highly susceptible to spontaneous rupture or necrosis, resulting in a permanent perforation. **2. Clinical Pearls for NEET-PG:** * **Toynbee Phenomenon:** Swallowing when the nose is obstructed leads to negative middle ear pressure. * **Earliest Sign of ETD:** Retraction of the tympanic membrane (short process of malleus becomes prominent). * **Management:** Valsalva maneuver, decongestants, or surgical intervention like Myringotomy with Grommet insertion to equalize pressure. **Conclusion:** Prolonged ET blockade is the "starting point" for a spectrum of chronic ear diseases, ranging from simple retraction to bone-eroding cholesteatoma and permanent perforation.

Q: Scanty, foul-smelling, painless discharge from the ear is a characteristic feature of which of the following lesions?

Cholesteatoma. ### Explanation The correct answer is **Cholesteatoma (Option B)**. **1. Why Cholesteatoma is Correct:** Cholesteatoma is a hallmark of **Attico-antral type** (unsafe) Chronic Suppurative Otitis Media (CSOM). The discharge is characteristically **scanty, foul-smelling, and painless**. * **Scanty:** Because the discharge arises from bone erosion and desquamated keratin rather than active mucosal secretion. * **Foul-smelling:** Due to the presence of anaerobic organisms and the osteitic (bone-eroding) nature of the disease. * **Painless:** Chronic ear disease is typically painless unless complications like mastoiditis or intracranial abscess occur. **2. Why the Other Options are Incorrect:** * **A. ASOM:** Presents with **severe earache** (otalgia) and fever. If the drum ruptures, the discharge is typically **profuse and blood-stained** initially, followed by mucopurulent discharge. * **C. Central Perforation:** This is seen in **Tubotympanic type** (safe) CSOM. The discharge is typically **profuse, mucoid/mucopurulent, and odorless**. It is not associated with bone erosion. * **D. Otitis Externa:** Usually presents with **severe pain** (especially on moving the pinna or tragus) and itching. The discharge is watery or serous, not typically "scanty and foul-smelling" in a chronic sense. **3. High-Yield Clinical Pearls for NEET-PG:** * **Safe vs. Unsafe CSOM:** Safe (Tubotympanic) involves the pars tensa and has mucoid discharge; Unsafe (Attico-antral) involves the pars flaccida/posterosuperior quadrant and has purulent, foul discharge. * **Bone Erosion:** Cholesteatoma produces enzymes like **collagenases and acid phosphatases** that destroy bone. * **The "Painless" Rule:** In ENT, a painless, foul-smelling ear discharge should always raise suspicion of Cholesteatoma or Malignancy. * **Microscopy:** The presence of "flakes of white" (keratin) in the discharge is pathognomonic for Cholesteatoma.

Q: External auditory canal exostosis occurs due to what?

Recurrent prolonged cold water exposure. **Explanation:** **External Auditory Canal (EAC) Exostosis**, also known as **"Surfer’s Ear,"** is a benign condition characterized by the formation of multiple, bilateral, sessile bony outgrowths in the bony portion of the external auditory canal. 1. **Why Option D is Correct:** The primary etiology is **recurrent and prolonged exposure to cold water** (and occasionally cold wind). This thermal stimulus triggers a reactive osteoblastic activity in the periosteum of the bony canal, leading to the formation of new lamellar bone. It is most commonly seen in surfers, divers, and swimmers. 2. **Why Other Options are Incorrect:** * **A & B:** Repeated instrumentation or chronic inflammation (Otitis Externa) typically leads to skin thickening, stenosis, or scarring (fibrosis), but does not stimulate the deep-seated periosteal bone growth characteristic of exostosis. * **C:** A wide meatus is a structural variation and does not have a causal relationship with bony overgrowth. **High-Yield Clinical Pearls for NEET-PG:** * **Morphology:** Exostoses are usually **multiple, bilateral, and sessile** (broad-based). They are typically found in the deeper (bony) part of the EAC. * **Osteoma vs. Exostosis:** This is a frequent point of confusion. * **Osteoma:** Usually **solitary, unilateral, and pedunculated**. It is a true benign neoplasm. * **Exostosis:** Usually **multiple, bilateral, and sessile**. It is a reactive hyperplasia. * **Clinical Presentation:** Often asymptomatic but can lead to conductive hearing loss or recurrent otitis externa due to the "trapping" of wax and water behind the bony protrusions. * **Management:** Conservative (earplugs) for mild cases; **Canalplasty** (surgical removal) if there is significant hearing loss or persistent infection.

Q: Which of the following viruses does NOT cause hearing loss?

Rotavirus. **Explanation:** The correct answer is **Rotavirus**. Hearing loss caused by viral infections is typically due to direct damage to the inner ear structures (cochlea or auditory nerve) or an inflammatory response within the labyrinth. **Why Rotavirus is the correct answer:** Rotavirus is a double-stranded RNA virus that primarily infects the enterocytes of the small intestine, leading to severe gastroenteritis. It does not exhibit neurotropism or the ability to invade the inner ear; therefore, it is not associated with sensorineural hearing loss (SNHL). **Analysis of incorrect options:** * **Measles (Rubeola):** Causes severe bilateral SNHL. The virus reaches the inner ear via the bloodstream, leading to permanent damage to the Organ of Corti. * **Mumps:** Historically one of the most common causes of **unilateral** Sausalito SNHL in children. It causes endolymphatic labyrinthitis. The hearing loss is often sudden and profound. * **Rubella:** A classic cause of congenital SNHL. If a mother is infected during the first trimester, the virus interferes with the development of the cochlea (Scheibe dysplasia), leading to the "Cookie-bite" audiogram pattern. **High-Yield Clinical Pearls for NEET-PG:** * **Most common viral cause of congenital SNHL:** Cytomegalovirus (CMV). * **Most common viral cause of acquired unilateral SNHL:** Mumps. * **Labyrinthitis vs. Neuronitis:** Viral labyrinthitis presents with both hearing loss and vertigo, whereas vestibular neuronitis presents with vertigo only (hearing is preserved). * **Ramsay Hunt Syndrome:** Caused by Herpes Zoster Oticus; presents with facial palsy, vesicles on the auricle, and SNHL/vertigo.

Q: Which of the following is NOT true about glue ear?

Myringotomy with curvilinear incision. **Explanation:** **Glue Ear**, clinically known as **Otitis Media with Effusion (OME)**, is characterized by the accumulation of non-purulent mucoid fluid in the middle ear cleft. **Why Option A is the correct answer (The False Statement):** In Glue Ear, the fluid is thick and tenacious. A **radial incision** (not curvilinear) is preferred for myringotomy. A radial incision is less traumatic to the circular fibers of the tympanic membrane, heals faster, and allows for better evacuation of the thick "glue." Curvilinear (circumferential) incisions are generally avoided as they can lead to wider scarring or permanent perforation. **Analysis of other options:** * **Option B:** **Grommet insertion** (ventilation tube) is the definitive surgical treatment. It bypasses the Eustachian tube to provide long-term ventilation and drainage. * **Option C:** **Otitis media with effusion** is the standard medical synonym for glue ear. * **Option D:** Myringotomy is performed in the **anteroinferior quadrant**. This is the safest site as it avoids injury to the ossicular chain (incudostapedial joint) and the chorda tympani nerve, which are located in the posterior quadrants. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of hearing loss in children:** Glue Ear. * **Audiometry:** Shows Conductive Hearing Loss (CHL) with a characteristic **B-type (flat) tympanogram**. * **Otoscopy:** Appearance of a dull, retracted tympanic membrane with restricted mobility; "air bubbles" or an amber-colored fluid level may be seen. * **Associated conditions:** Often linked to adenoid hypertrophy, cleft palate, or Eustachian tube dysfunction. In an adult with unilateral glue ear, always rule out **Nasopharyngeal Carcinoma**.

Q: Which statement about deafness in Alport syndrome is true?

Deafness always accompanied by evidence of renal disease. ### Explanation **Alport Syndrome** is a hereditary disorder caused by mutations in the genes encoding **Type IV collagen** (specifically the $\alpha3$, $\alpha4$, and $\alpha5$ chains). Since Type IV collagen is a structural component of basement membranes in the kidney (glomerulus), eye, and cochlea, the clinical manifestations are multisystemic. #### Why Option C is Correct: The auditory involvement in Alport syndrome is a **progressive sensorineural hearing loss (SNHL)**. Crucially, the hearing loss never occurs in isolation; it is **always accompanied by renal manifestations**, such as hematuria or proteinuria, which typically precede the deafness. The defect lies in the stria vascularis of the cochlea, which shares similar basement membrane characteristics with the renal glomerulus. #### Why Other Options are Incorrect: * **Option A:** The deafness is **Sensorineural**, not conductive. It typically affects high frequencies (2000–8000 Hz) initially. * **Option B:** It is **not congenital**. Hearing is usually normal at birth; the deficit typically manifests during late childhood or adolescence (usually before age 20). * **Option C:** The progression is generally **gradual**, not "fast progressing," though it can lead to significant impairment by early adulthood. #### NEET-PG High-Yield Pearls: * **Inheritance:** Most common is **X-linked Dominant** (COL4A5 mutation). * **Classic Triad:** 1. **Renal:** Progressive hematuria leading to End-Stage Renal Disease (ESRD). 2. **Ocular:** **Anterior Lenticonus** (pathognomonic) and "dot-and-fleck" retinopathy. 3. **Auditory:** Bilateral high-frequency SNHL. * **Diagnosis:** Electron microscopy of renal biopsy shows a characteristic **"Basket-weave" appearance** of the Glomerular Basement Membrane (GBM).

Q: How is Eustachian tube patency assessed?

All of the above. The Eustachian tube (ET) serves three primary functions: ventilation, protection, and clearance of the middle ear. Assessing its patency is crucial in diagnosing middle ear pathologies. **Explanation of Options:** * **Valsalva Maneuver:** This is an **active** test of ET patency. The patient forcibly exhales against a closed glottis, nose, and mouth. This increases nasopharyngeal pressure, forcing air into the ET. Success is confirmed by seeing the tympanic membrane (TM) move outward on otoscopy or hearing a "pop." * **Toynbee Test:** This is considered more physiological than Valsalva. The patient swallows while the nose is pinched shut. This creates negative pressure in the nasopharynx, drawing air out of the middle ear and causing inward movement of the TM. * **Methylene Blue Test:** This is a test of the **mucociliary clearance** function of the ET. A dye (like methylene blue or saccharin) is instilled into the middle ear through a perforation or grommet. If the ET is patent, the dye will appear in the nasopharynx (seen on posterior rhinoscopy) or the patient will report a metallic/sweet taste. **Clinical Pearls for NEET-PG:** 1. **Politzerization:** A method of inflating the middle ear using a Politzer bag; useful in children who cannot perform Valsalva. 2. **Tympanometry:** The most objective way to assess ET function. A **Type C tympanogram** (negative pressure) indicates ET dysfunction. 3. **Patulous Eustachian Tube:** A condition where the tube remains abnormally open. Patients complain of **autophony** (hearing their own voice/breath sounds). 4. **Siegle’s Speculum:** Can be used to observe TM mobility during Valsalva/Toynbee maneuvers.

Question 1

What type of eardrum perforation is considered unsafe?

Accepted Answer

Marginal

Answer

Central

Answer

Paracentral

Answer

Multiple central

Question 2

The 'delta sign' observed on a CT scan is characteristic of which condition?

Accepted Answer

Lateral sinus thrombophlebitis

Answer

Petrositis

Answer

Otogenic brain abscess

Answer

Otosclerosis

Question 3

What is the consequence of prolonged blockade of the Eustachian tube?

Accepted Answer

All of the above

Answer

Atelectatic ear

Answer

Cholesteatoma

Answer

Perforation

Question 4

Scanty, foul-smelling, painless discharge from the ear is a characteristic feature of which of the following lesions?

Accepted Answer

Cholesteatoma

Answer

Acute suppurative otitis media (ASOM)

Answer

Central perforation

Answer

Otitis externa

Question 5

External auditory canal exostosis occurs due to what?

Accepted Answer

Recurrent prolonged cold water exposure

Answer

Repeated instrumentation

Answer

Recurrent otitis externa

Answer

Wide external auditory meatus

Question 6

Which of the following viruses does NOT cause hearing loss?

Accepted Answer

Rotavirus

Answer

Measles

Answer

Mumps

Answer

Rubella

Question 7

Which of the following is NOT true about glue ear?

Accepted Answer

Myringotomy with curvilinear incision

Answer

Grommet insertion is the treatment

Answer

Also known as otitis media with effusion

Answer

Myringotomy performed in the anteroinferior quadrant

Question 8

The Tobey-Ayer test is positive in which of the following conditions?

Accepted Answer

Lateral sinus thrombosis

Answer

Petrositis

Answer

Cerebral abscess

Answer

Subarachnoid haemorrhage

Question 9

Which statement about deafness in Alport syndrome is true?

Accepted Answer

Deafness always accompanied by evidence of renal disease

Answer

High-tone conductive deafness

Answer

Congenital deafness

Answer

Deafness is fast progressing

Question 10

How is Eustachian tube patency assessed?

Accepted Answer

All of the above

Answer

Valsalva maneuver

Answer

Methylene blue test

Answer

Toynbee test

Diseases of the Ear — MCQs

Diseases of the Ear — MCQs

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