Diseases of the Ear Practice Questions

Q: A 35-year-old patient presents with 6 weeks of ear discharge that is not foul-smelling. Which of the following management options is NOT indicated?

Mastoidectomy. ### Explanation The clinical presentation of 6 weeks of **non-foul-smelling** ear discharge suggests a diagnosis of **Chronic Suppurative Otitis Media (CSOM) - Mucosal type** (also known as Tubotympanic or "Safe" type). **1. Why Mastoidectomy is NOT indicated:** Mastoidectomy is primarily indicated for **Squamosal type CSOM** (Atticoantral or "Unsafe" type), which is characterized by bone-eroding cholesteatoma and foul-smelling discharge. In Mucosal CSOM, the pathology is limited to the middle ear mucosa without bone destruction. Therefore, an invasive mastoidectomy is unnecessary unless there is evidence of mastoid reservoir infection or failure of conservative management. **2. Analysis of other options:** * **Topical Antibiotics (A):** These are the first-line treatment for an active mucosal ear discharge to control infection and achieve a "dry ear." * **Systemic Antibiotics (B):** Indicated during acute exacerbations or when topical therapy alone is insufficient to control the infection. * **Tympanoplasty (D):** This is the definitive surgical treatment for Mucosal CSOM. Once the ear is dry, tympanoplasty is performed to reconstruct the hearing mechanism and close the tympanic membrane perforation. **3. Clinical Pearls for NEET-PG:** * **Mucosal (Safe) CSOM:** Central perforation, non-foul-smelling (mucoid) discharge, low risk of complications. Treatment: Medical management followed by **Tympanoplasty**. * **Squamosal (Unsafe) CSOM:** Marginal/Attic perforation, foul-smelling (purulent) discharge, presence of cholesteatoma, high risk of intracranial complications. Treatment: **Mastoidectomy** (Modified Radical or Canal Wall Down). * **Rule of Thumb:** If the discharge is "safe," think reconstruction (Tympanoplasty); if "unsafe," think clearance (Mastoidectomy).

Q: What is the diagnosis?

Exostosis. ***Exostosis*** - Shows characteristic **smooth, hard, bony protrusions** in the external auditory canal on otoscopic examination. - Often called **"surfer's ear"** due to association with chronic cold water exposure, causing reactive bone growth. *Otitis externa* - Would show **inflamed, erythematous skin** with possible discharge and debris in the ear canal. - Patient would typically present with **ear pain** and **tenderness** on manipulation of the pinna. *Keratosis obturans* - Appears as a **white, keratin plug** that completely obstructs the ear canal. - Associated with **conductive hearing loss** and **ear fullness** rather than bony growths. *Cerumen* - Presents as **waxy, yellowish-brown material** that can vary in consistency from soft to hard. - Has a **characteristic waxy appearance** and texture, unlike the smooth bony surface seen in exostosis.

Q: Ototoxic drugs generally affect the hearing of what frequencies of sound?

4000-5000 Hz. **Explanation:** The correct answer is **D (4000-5000 Hz)**. **Medical Concept:** Ototoxicity typically manifests as sensorineural hearing loss (SNHL) that begins at the **basal turn of the cochlea**. According to the tonotopic organization of the cochlea (Place Theory), the base is responsible for processing **high-frequency sounds**, while the apex processes low-frequency sounds. Ototoxic agents (such as Aminoglycosides, Cisplatin, and Loop diuretics) cause damage to the outer hair cells starting at the base; therefore, the earliest clinical sign of toxicity is a dip in hearing at high frequencies, specifically in the **4000-8000 Hz** range. In the context of the provided options, 4000-5000 Hz represents the onset of this high-frequency loss. **Analysis of Incorrect Options:** * **A (500-1000 Hz):** These are low frequencies processed at the apex of the cochlea. These are usually preserved until the late stages of ototoxicity. * **B & C (2000-4000 Hz):** While these are higher frequencies, they are generally affected *after* the initial damage occurs at the extreme basal end (4000 Hz and above). 2000-3000 Hz is considered part of the "speech frequency" range, which is typically spared in early ototoxicity. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice for Monitoring:** **High-frequency Audiometry** (up to 20,000 Hz) or **Otoacoustic Emissions (OAEs)** are the most sensitive tests for early detection of ototoxicity before the patient notices clinical hearing loss. * **Aminoglycosides:** Streptomycin and Gentamicin are more **vestibulotoxic**; Amikacin, Neomycin, and Kanamycin are more **cochleotoxic**. * **Cisplatin:** Causes bilateral, symmetrical, irreversible high-frequency SNHL. * **Loop Diuretics:** (e.g., Furosemide) usually cause reversible hearing loss, unlike Aminoglycosides which are permanent.

Q: The given appearance of the pinna is suggestive of which of the following conditions?

Post-traumatic. ***Post-traumatic*** - The appearance shows **cauliflower ear**, a classic deformity resulting from **repeated trauma** causing hematoma formation between cartilage and perichondrium. - **Fibrosis** and **cartilage necrosis** develop when blood supply is compromised, leading to the characteristic **thickened, irregular contour**. *Pseudomonas infection* - **Perichondritis** from Pseudomonas typically presents with **acute pain**, **erythema**, and **swelling** of the pinna. - The cartilage remains **smooth** initially, with **purulent discharge** and systemic symptoms, unlike the chronic deformity seen here. *Aspergillus infection* - **Otomycosis** caused by Aspergillus primarily affects the **external auditory canal**, not the pinna structure. - Presents with **black or green discharge**, **itching**, and **hearing loss**, without pinna deformity. *Tuberculosis* - **TB of the pinna** is rare and presents as **chronic ulcerative lesions** or **lupus vulgaris** with reddish-brown plaques. - Causes **tissue destruction** and scarring but not the specific **cauliflower-like thickening** seen in trauma cases.

Q: Conductive hearing loss is seen in all of the following conditions EXCEPT:

Presbycusis. **Explanation:** The core concept in this question is differentiating between **Conductive Hearing Loss (CHL)** and **Sensorineural Hearing Loss (SNHL)**. CHL occurs when sound waves are blocked from reaching the inner ear due to pathology in the external or middle ear. SNHL occurs due to damage to the cochlea (hair cells) or the vestibulocochlear nerve (CN VIII). **Why Presbycusis is the Correct Answer:** **Presbycusis** is age-related hearing loss. It is a progressive, bilateral, symmetrical **Sensorineural Hearing Loss** caused by the degeneration of hair cells in the Organ of Corti, stria vascularis, or spiral ganglion cells. Since it involves the inner ear/neural pathway, it does not cause conductive loss. **Analysis of Incorrect Options (Causes of CHL):** * **CSOM (Chronic Suppurative Otitis Media):** Involves a permanent perforation of the tympanic membrane and/or ossicular chain destruction, preventing efficient sound conduction to the oval window. * **ASOM (Acute Suppurative Otitis Media):** The accumulation of inflammatory pus in the middle ear increases the stiffness of the tympanic membrane and ossicles, leading to CHL. * **Middle Ear Effusion (Otitis Media with Effusion):** The presence of sterile fluid in the middle ear (common in children) creates a "glue ear" effect, significantly dampening sound vibration. **NEET-PG High-Yield Pearls:** 1. **Presbycusis** typically starts with high-frequency sounds (difficulty hearing in noisy environments). 2. **Otosclerosis** is a classic cause of CHL where the stapes footplate becomes fixed; look for **Carhart’s Notch** (dip at 2000 Hz in bone conduction) on audiometry. 3. In CHL, **Rinne’s test** is negative (BC > AC) and **Weber’s test** lateralizes to the poorer ear. 4. In SNHL, **Rinne’s test** is positive (AC > BC) and **Weber’s test** lateralizes to the better ear.

Q: What is the most common extra-cranial complication of acute suppurative otitis media (ASOM)?

Subperiosteal abscess. **Explanation:** The correct answer is **Subperiosteal abscess**. **Why it is correct:** Complications of Otitis Media are divided into intra-cranial and extra-cranial (intra-temporal). Among the extra-cranial complications of Acute Suppurative Otitis Media (ASOM), the most frequent is a **subperiosteal abscess**, specifically a **Post-auricular abscess**. This occurs when the infection spreads from the mastoid air cells through the lateral mastoid cortex, collecting between the bone and the periosteum. In children, this is particularly common due to the thinness of the mastoid cortex and open sutures. **Analysis of incorrect options:** * **A. Facial nerve paralysis:** While a common intra-temporal complication of *chronic* otitis media (cholesteatoma), it is less frequent than a subperiosteal abscess in the setting of *acute* infection. * **B. Lateral sinus thrombosis:** This is an **intra-cranial** vascular complication. While serious, it occurs less frequently than localized abscess formation. * **C. Brain abscess:** This is the most common **intra-cranial** complication of otitis media overall, but it is not an extra-cranial complication. **High-Yield Clinical Pearls for NEET-PG:** * **Most common extra-cranial complication (ASOM/CSOM):** Subperiosteal (Post-auricular) abscess. * **Most common intra-cranial complication:** Brain abscess (specifically in the temporal lobe or cerebellum). * **Most common route of spread:** Decalification (retrograde thrombophlebitis) in ASOM; Bone erosion in CSOM. * **Bezold’s Abscess:** A rare extra-cranial complication where pus tracks into the sternocleidomastoid muscle. * **Citelli’s Abscess:** Pus tracks into the posterior belly of the digastric muscle.

Q: What is the most common cause of congenital sensorineural hearing loss?

Cytomegalovirus (CMV). **Explanation:** **Cytomegalovirus (CMV)** is the most common cause of non-hereditary (acquired) congenital sensorineural hearing loss (SNHL) worldwide. While most infants with congenital CMV are asymptomatic at birth (90%), approximately 10–15% of these "asymptomatic" infants will eventually develop SNHL. In symptomatic cases, the incidence of SNHL rises to over 50%. The hearing loss is often progressive, can be unilateral or bilateral, and may have a delayed onset, making CMV a critical diagnosis to consider in pediatric audiology. **Analysis of Incorrect Options:** * **Parvovirus B19 (A):** Primarily associated with hydrops fetalis due to severe fetal anemia and aplastic crisis; it is not a recognized cause of congenital hearing loss. * **Rubella (C):** Historically, Congenital Rubella Syndrome (CRS) was a leading cause of SNHL (presenting with the classic triad of cataracts, PDA, and deafness). However, due to widespread MMR vaccination, its incidence has drastically declined, making CMV more prevalent. * **Toxoplasmosis (D):** Part of the TORCH spectrum, it typically presents with the triad of chorioretinitis, hydrocephalus, and intracranial calcifications. While it can cause SNHL, it is significantly less common than CMV. **High-Yield Clinical Pearls for NEET-PG:** * **Imaging:** CMV typically shows **periventricular calcifications**, whereas Toxoplasmosis shows **diffuse** intracranial calcifications. * **Diagnosis:** The gold standard for congenital CMV is detecting the virus in **urine or saliva via PCR** within the first 3 weeks of life. * **Treatment:** Oral **Valganciclovir** (or IV Ganciclovir) for 6 months is indicated for symptomatic neonates to improve hearing and neurodevelopmental outcomes. * **Overall Cause:** While CMV is the most common *infectious* cause, **GJB2 gene mutations** (Connexin 26) are the most common *genetic* cause of congenital SNHL.

Q: What is the true statement about Acute Suppurative Otitis Media (ASOM)?

It most frequently resolves without sequelae.. **Explanation:** **Acute Suppurative Otitis Media (ASOM)** is an acute pyogenic inflammation of the middle ear cleft, typically following an upper respiratory tract infection (URTI) via the Eustachian tube. **1. Why Option A is Correct:** The natural history of ASOM involves stages (Hyperemia, Exudation, Suppuration, Resolution, and Complication). With the advent of modern antibiotics and timely intervention, the vast majority of cases enter the **Stage of Resolution**, where the tympanic membrane heals, hearing returns to normal, and the infection clears without leaving any permanent damage or sequelae. **2. Why Other Options are Incorrect:** * **Option B:** ASOM typically follows **viral URTI** (like the common cold, influenza, or measles) or adenoiditis, not parotitis. Parotitis (mumps) is more commonly associated with sudden sensorineural hearing loss (SNHL), not suppurative middle ear infection. * **Option C:** Treatment is primarily **medical**, consisting of antibiotics (Amoxicillin is the drug of choice), nasal decongestants, and analgesics. Surgery is reserved for complications; even then, a **Myringotomy** is the procedure of choice for severe pain or bulging. Radical mastoidectomy is used for Chronic Suppurative Otitis Media (CSOM) with cholesteatoma. * **Option D:** The most common causative organism in ASOM is ***Streptococcus pneumoniae***, followed by *Haemophilus influenzae* and *Moraxella catarrhalis*. *Pseudomonas aeruginosa* is the hallmark of CSOM (Safe/Tubotympanic type). **High-Yield Clinical Pearls for NEET-PG:** * **Most common route of infection:** Eustachian tube. * **Earliest sign:** Cartwheel appearance of the tympanic membrane (vessels radiating from the handle of malleus). * **Pulsatile Otorrhea:** Known as the **"Lighthouse sign,"** seen in the Stage of Suppuration. * **Drug of Choice:** Amoxicillin (or Amoxicillin-Clavulanate).

Q: A blue eardrum is typically seen in which of the following conditions?

Secretory otitis media. **Explanation:** The color of the tympanic membrane (TM) is a vital diagnostic clue in ENT. A **blue eardrum** (idiopathic hemotympanum) in **Secretory Otitis Media (SOM)** occurs due to the presence of sterile, brownish-yellow fluid in the middle ear. When this fluid is viewed through the translucent TM, the light reflection and the underlying vascular congestion create a characteristic bluish or slate-grey appearance. In chronic cases, the breakdown of hemoglobin into hemosiderin within the middle ear effusion further contributes to this "blue" discoloration. **Analysis of Options:** * **Tympanosclerosis:** Characterized by hyalinization and calcification of the TM, appearing as **chalky white patches** (horseshoe-shaped). * **Otosclerosis:** Usually presents with a normal TM. However, in active phases (Schwartze sign), a **flamingo pink** hue is seen due to increased vascularity over the promontory. * **Myringitis Bullosa:** Presents with **serosanguinous bullae** (blisters) on the TM surface, typically following a viral infection. **High-Yield Clinical Pearls for NEET-PG:** 1. **Golden Yellow/Amber TM:** Also seen in Secretory Otitis Media (early stages). 2. **Red/Bulging TM:** Classic sign of Acute Suppurative Otitis Media (ASOM) – "Cartwheel appearance." 3. **Brown/Black TM:** Suggests a fungal infection (Otomycosis) or a foreign body. 4. **Differential Diagnosis for Blue TM:** Apart from SOM, always consider a **High Jugular Bulb** or a **Glomus Tumor** (Rising sun appearance).

Question 1

A 35-year-old patient presents with 6 weeks of ear discharge that is not foul-smelling. Which of the following management options is NOT indicated?

Accepted Answer

Mastoidectomy

Answer

Topical antibiotics

Answer

Systemic antibiotics

Answer

Tympanoplasty

Question 2

What is the diagnosis?

Accepted Answer

Exostosis

Answer

Otitis externa

Answer

Keratosis obturans

Answer

Cerumen

Question 3

Ototoxic drugs generally affect the hearing of what frequencies of sound?

Accepted Answer

4000-5000 Hz

Answer

500-1000 Hz

Answer

2000-3000 Hz

Answer

3000-4000 Hz

Question 4

A 32-year-old teacher presents complaining of hearing loss in her right ear. Physical examination reveals cerumen completely obstructing the ear canal. Which of the following methods is recommended for ear wax removal?

Accepted Answer

3% hydrogen peroxide ear drops

Answer

Jet irrigation (Water Pik)

Answer

Irrigation of the eardrum if perforated

Answer

Aqueous irrigation if a bean is present

Question 5

The given appearance of the pinna is suggestive of which of the following conditions?

Accepted Answer

Post-traumatic

Answer

Pseudomonas infection

Answer

Aspergillus infection

Answer

Tuberculosis

Question 6

Conductive hearing loss is seen in all of the following conditions EXCEPT:

Accepted Answer

Presbycusis

Answer

Chronic suppurative otitis media (CSOM)

Answer

Acute suppurative otitis media (ASOM)

Answer

Middle ear effusion

Question 7

What is the most common extra-cranial complication of acute suppurative otitis media (ASOM)?

Accepted Answer

Subperiosteal abscess

Answer

Facial nerve paralysis

Answer

Lateral sinus thrombosis

Answer

Brain abscess

Question 8

What is the most common cause of congenital sensorineural hearing loss?

Accepted Answer

Cytomegalovirus (CMV)

Answer

Parvovirus

Answer

Rubella

Answer

Toxoplasmosis

Question 9

What is the true statement about Acute Suppurative Otitis Media (ASOM)?

Accepted Answer

It most frequently resolves without sequelae.

Answer

It commonly follows painful parotitis.

Answer

Radical mastoidectomy is required for treatment.

Answer

The most common organism is Pseudomonas.

Question 10

A blue eardrum is typically seen in which of the following conditions?

Accepted Answer

Secretory otitis media

Answer

Tympanosclerosis

Answer

Otosclerosis

Answer

Myringitis bullosa

Diseases of the Ear — MCQs

Diseases of the Ear — MCQs

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