Diseases of the Ear Practice Questions

Q: In Mastoiditis, tenderness is present at which anatomical landmark?

Mastoid tip. ### Explanation **Correct Answer: C. Mastoid tip** **Medical Concept:** Mastoiditis is an inflammation of the mastoid air cells, usually occurring as a complication of Acute Otitis Media (AOM). The mastoid process is a bony prominence located behind the pinna. In acute mastoiditis, pus accumulates under pressure within the mastoid antrum and air cells, leading to hyperemia and osteitis of the overlying periosteum. This results in **exquisite tenderness** over the **mastoid tip** and the **Macewen’s triangle** (suprameatal triangle), which is the surgical landmark for the mastoid antrum. **Analysis of Incorrect Options:** * **A. Tragus:** Tenderness on pressing the tragus (**Tragus sign**) is a classic feature of **Otitis Externa** (inflammation of the external auditory canal) or furunculosis. It is absent in uncomplicated mastoiditis. * **B. Concha:** The concha is part of the external ear cartilage. While it may be displaced laterally or forward in mastoiditis (causing the "proptosis of the pinna"), direct tenderness of the concha itself is not a diagnostic sign of mastoiditis. * **D. All of the above:** Incorrect because tragal tenderness specifically differentiates external ear pathology from middle ear/mastoid pathology. **High-Yield Clinical Pearls for NEET-PG:** * **Reservoir Sign:** If the ear is mopped dry and pus reappears immediately in the meatus, it indicates a large reservoir of pus in the mastoid (highly suggestive of mastoiditis). * **Ironing out effect:** Due to periosteal thickening, the normal bony contours of the mastoid process feel smooth or "ironed out" on palpation. * **Radiology:** The investigation of choice is **HRCT Temporal Bone**, which shows clouding of air cells and loss of bony trabeculae (coalescent mastoiditis). * **Sagging of the posterosuperior meatal wall:** A pathognomonic sign caused by periosteitis adjacent to the mastoid antrum.

Q: What is the most common mode of inheritance for otosclerosis?

Autosomal Dominant. **Explanation:** **Otosclerosis** is a primary metabolic bone disease of the otic capsule characterized by abnormal bone remodeling, leading to the fixation of the stapes footplate and subsequent conductive hearing loss. **1. Why Autosomal Dominant is correct:** The most common mode of inheritance for clinical otosclerosis is **Autosomal Dominant with incomplete penetrance (approx. 40%) and variable expressivity**. This means that while the gene is dominant, not every individual who inherits the gene will manifest the clinical disease. Approximately 50% of cases have a positive family history. **2. Analysis of Incorrect Options:** * **Autosomal Recessive (A):** While many forms of congenital sensorineural deafness (like GJB2 mutations) follow this pattern, otosclerosis is classically associated with a dominant familial pattern. * **X-linked Recessive (B):** This pattern is rare in ear pathology, though it is seen in conditions like *DFNX2* (associated with stapes gusher). It does not apply to otosclerosis. * **Y-linked (D):** Y-linked inheritance is extremely rare in human genetics and does not play a role in otosclerosis. **3. NEET-PG High-Yield Pearls:** * **Demographics:** Most common in females (2:1 ratio), usually presenting in the 2nd–4th decades of life. * **Clinical Sign:** Hearing loss often worsens during **pregnancy** or menopause due to hormonal changes. * **Schwartze Sign:** A flamingo-pink flush seen on the promontory through the tympanic membrane, indicating active disease (otospongiosis). * **Carhart’s Notch:** A characteristic dip in the bone conduction threshold at **2000 Hz**. * **Treatment of Choice:** Stapedotomy (using a Teflon piston).

Q: On examination of the ear of a patient, you observe that the left ear tympanic membrane is reddish, immobile, and bulging, whilst the right ear tympanic membrane is white, mobile, and translucent. These findings suggest:

Right ear normal with left acute otitis media. ### Explanation **1. Why Option A is Correct:** The clinical description of the left ear—**reddish (hyperemic), immobile, and bulging**—is the classic triad for **Acute Otitis Media (AOM)** in the stage of suppuration. * **Redness:** Caused by intense vascular congestion of the tympanic membrane (TM). * **Bulging:** Occurs due to the accumulation of pus in the middle ear space, which increases pressure and pushes the TM outward (loss of landmarks). * **Immobility:** Pneumatic otoscopy would show no movement because the middle ear is filled with fluid/pus rather than air. Conversely, the right ear is described as **white (pearly gray), mobile, and translucent**. These are the hallmarks of a **normal tympanic membrane**. The translucency allows for the visualization of the long process of the incus and the cone of light, while mobility confirms a well-ventilated middle ear via the Eustachian tube. **2. Why Other Options are Incorrect:** * **Option B:** Reverses the findings; a white, mobile TM cannot be acutely infected. * **Option C:** The left ear findings (bulging and redness) are pathological and indicate an inflammatory process. * **Option D:** The right ear lacks any signs of inflammation (erythema) or effusion (immobility), ruling out bilateral involvement. **3. NEET-PG Clinical Pearls:** * **Stages of AOM:** 1. *Tubal Occlusion:* Retracted TM. 2. *Presuppuration:* Cartwheel appearance (vessels radiating from the handle of malleus). 3. *Suppuration:* Bulging TM (Lighthouse sign may be seen if a small perforation exists). 4. *Resolution/Coalescence.* * **Myringotomy Incision:** In AOM, it is performed in the **postero-inferior quadrant** to avoid injury to the ossicles (incus/stapes) and the chorda tympani nerve. * **Most Common Organism:** *Streptococcus pneumoniae* is the most common cause of AOM.

Q: In otoscopy, the presence of a fluid level and an air bubble typically indicates which of the following conditions?

Middle ear effusion. **Explanation:** The presence of a **fluid level** and **air bubbles** behind an intact tympanic membrane is a pathognomonic sign of **Middle Ear Effusion (Otitis Media with Effusion - OME)**. This occurs when the Eustachian tube is dysfunctional, creating negative pressure that draws transudate into the middle ear. When air enters the fluid-filled cavity (often during a Valsalva maneuver or yawning), it creates visible bubbles or a meniscus (fluid level). **Analysis of Options:** * **Middle Ear Effusion (Correct):** Characterized by a retracted or neutral drum with amber-colored fluid. The "hairline" fluid level or bubbles are classic findings. * **Chronic Suppurative Otitis Media (CSOM):** Typically presents with a **permanent perforation** of the tympanic membrane and ear discharge (otorrhea). Fluid levels cannot form if the drum is perforated. * **Acute Suppurative Otitis Media (ASOM):** Presents with signs of acute inflammation, such as a bulging, congested, and erythematous (red) tympanic membrane, usually accompanied by severe pain and fever. * **Otosclerosis:** This is a bony pathology of the otic capsule. The tympanic membrane usually appears completely **normal** (pearly white), though a "Schwartze sign" (flamingo pink flush) may be seen in active cases. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Tympanometry, which shows a **Type B (flat) curve**. * **Hearing Loss:** OME is the most common cause of conductive hearing loss in children. * **Management:** Initial observation (watchful waiting); if persistent, Myringotomy with **Grommet insertion** is the treatment of choice. * **Bialateral OME in adults:** Always rule out **Nasopharyngeal Carcinoma** by examining the Fossa of Rosenmüller.

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.

Question 1

In Mastoiditis, tenderness is present at which anatomical landmark?

Accepted Answer

Mastoid tip

Answer

Tragus

Answer

Concha

Answer

All of the above

Question 2

Which of the following statements are true about idiopathic sudden sensorineural hearing loss?

Accepted Answer

Hearing loss occurs within 24 hours.

Answer

Vertigo is always present.

Answer

Carbogen (5% CO2 + 95% O2) is beneficial.

Answer

Hearing loss occurs within 72 hours.

Question 3

What is the most common mode of inheritance for otosclerosis?

Accepted Answer

Autosomal Dominant

Answer

Autosomal Recessive

Answer

X-linked Recessive

Answer

Y-linked

Question 4

On examination of the ear of a patient, you observe that the left ear tympanic membrane is reddish, immobile, and bulging, whilst the right ear tympanic membrane is white, mobile, and translucent. These findings suggest:

Accepted Answer

Right ear normal with left acute otitis media

Answer

Left ear normal with right acute otitis media

Answer

Bilateral ear normal

Answer

Bilateral acute otitis media

Question 5

In otoscopy, the presence of a fluid level and an air bubble typically indicates which of the following conditions?

Accepted Answer

Middle ear effusion

Answer

Chronic suppurative otitis media

Answer

Acute suppurative otitis media

Answer

Otosclerosis

Question 6

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 7

What type of eardrum perforation is considered unsafe?

Accepted Answer

Marginal

Answer

Central

Answer

Paracentral

Answer

Multiple central

Question 8

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 9

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 10

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

Diseases of the Ear — MCQs

Diseases of the Ear — MCQs

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