Diseases of the Ear Practice Questions

Q: External auditory canal atresia has been associated with all of the following except?

Polyhydramnios. **Explanation:** Congenital External Auditory Canal (EAC) Atresia occurs due to a failure in the canalization of the first branchial cleft during the 7th month of intrauterine life. It is frequently associated with microtia and ossicular malformations. **Why Polyhydramnios is the Correct Answer:** Polyhydramnios (excessive amniotic fluid) is **not** a known risk factor for EAC atresia. In fact, EAC atresia and associated renal anomalies (as seen in syndromes like Townes-Brocks) are more frequently linked with **Oligohydramnios** (deficient amniotic fluid) due to decreased fetal urine production. Polyhydramnios is typically associated with fetal gastrointestinal obstructions or CNS anomalies that interfere with swallowing. **Analysis of Incorrect Options:** * **Low Birth Weight:** Prematurity and low birth weight are statistically significant risk factors for various congenital craniofacial anomalies, including aural atresia. * **Intrauterine Infections:** TORCH infections (especially **Rubella**) are well-documented causes of congenital ear malformations and sensorineural hearing loss. * **Intrauterine Toxins:** Teratogenic exposure during the first trimester is a major cause. Classic examples include **Thalidomide**, Isotretinoin (Vitamin A derivatives), and maternal alcohol consumption. **High-Yield Clinical Pearls for NEET-PG:** * **Embryology:** The EAC develops from the **1st Branchial Cleft**; the Pinna develops from **6 Hillocks of His** (1st and 2nd arches). * **Syndromic Associations:** EAC atresia is commonly seen in **Treacher Collins Syndrome**, **Goldenhar Syndrome**, and **Branchio-Oto-Renal (BOR) Syndrome**. * **Management:** The gold standard for evaluation is a **High-Resolution CT (HRCT) of the Temporal Bone** to assess the Jahrsdoerfer scale score before surgical reconstruction.

Q: The pressure difference that can cause atmosphere and middle ear barotrauma is:

> 90 mmHg. **Explanation:** **1. The Correct Answer: D (> 90 mmHg)** Barotrauma occurs due to a failure of the Eustachian tube (ET) to equalize pressure between the middle ear and the external environment, most commonly during rapid descent in flights or diving. * When the negative pressure in the middle ear reaches **90 mmHg** relative to the atmosphere, it creates a "locking" effect. * At this critical pressure gradient, the tensor veli palatini muscle is unable to overcome the vacuum to open the ET. This is known as **Eustachian Tube Locking**. If the pressure difference exceeds this limit, the tympanic membrane may retract severely, leading to mucosal edema, transudate (serous otitis), or hemorrhage. **2. Why Other Options are Incorrect:** * **A, B, and C (60–80 mmHg):** While these pressure differences cause significant discomfort, ear fullness, and pain (otalgia), they are generally below the threshold of the "locking" phenomenon. At these levels, the patient can still potentially equalize pressure using the **Valsalva maneuver**. The physiological "point of no return" where the tube is physically held shut by suction is specifically cited in medical literature as > 90 mmHg. **3. Clinical Pearls for NEET-PG:** * **Most common cause:** Descent in an aircraft (negative middle ear pressure). * **Eustachian Tube Locking:** Occurs at > 90 mmHg; at this stage, Valsalva will fail and may actually worsen the condition. * **Teed’s Classification:** Used to grade the severity of middle ear barotrauma (Grade 0 to 5). * **Prevention:** Chewing gum, swallowing, or performing the Toynbee/Valsalva maneuver during descent. * **Treatment:** Decongestants (nasal and oral) to reduce ET edema; myringotomy is reserved for severe cases with persistent fluid or hemotympanum.

Q: Lateral sinus thrombosis is associated with all of the following except:

Gradenigo triad. **Explanation:** **Lateral Sinus Thrombosis (LST)**, also known as Sigmoid Sinus Thrombosis, is a serious intracranial complication of chronic suppurative otitis media (CSOM). It occurs when infection spreads to the venous sinus, leading to thrombus formation. **Why Gradenigo Triad is the Correct Answer:** Gradenigo triad is the hallmark of **Petrositis** (infection of the petrous apex), not lateral sinus thrombosis. It consists of: 1. **Abducens (VI) nerve palsy** (causing diplopia). 2. **Deep-seated retro-orbital pain** (due to Trigeminal/V nerve involvement). 3. **Persistent ear discharge.** **Analysis of Other Options (Associated with LST):** * **Griesinger’s Sign:** Edema and tenderness over the mastoid process due to thrombosis of the **mastoid emissary vein**. * **Crowe-Beck Sign:** Engorgement of retinal veins and supraorbital veins upon manual compression of the internal jugular vein (IJV) on the healthy side. * **Tobey-Ayer Test:** A manometric test during lumbar puncture. Compression of the IJV on the diseased side causes no rise in CSF pressure, whereas compression on the healthy side causes a rapid rise. **High-Yield Clinical Pearls for NEET-PG:** * **Picket-fence fever:** The characteristic clinical presentation of LST (hectic spikes with chills and rigors). * **Greisinger's sign** is a classic physical exam finding for LST. * **Investigation of Choice:** MR Venogram (shows the "Empty Delta Sign"). * **Management:** Intravenous antibiotics, anticoagulants, and mastoidectomy with clot removal if necessary.

Q: What is the most common cause of bilateral conductive deafness in a child?

Otitis media with effusion (OME). **Explanation:** **1. Why Otitis Media with Effusion (OME) is correct:** Otitis media with effusion (also known as "Glue Ear") is the most common cause of hearing impairment in children worldwide. It is characterized by the presence of non-purulent fluid in the middle ear space without signs of acute infection. In children, the Eustachian tube is shorter, wider, and more horizontal, making it prone to dysfunction (often due to adenoid hypertrophy). This leads to negative middle ear pressure and fluid accumulation, resulting in a **bilateral conductive hearing loss (CHL)** typically ranging from 20–40 dB. **2. Why other options are incorrect:** * **Otosclerosis:** This is a common cause of CHL in **adults** (usually 20–40 years), characterized by stapes fixation. It is rare in the pediatric population. * **Acute Otitis Media (AOM):** While AOM causes CHL, it is an acute inflammatory condition presenting with pain and fever. OME is the more common cause of *persistent* bilateral deafness. * **Congenital Cholesteatoma:** This is usually a **unilateral** condition presenting as a white mass behind an intact tympanic membrane. It is far less common than OME. **3. High-Yield Clinical Pearls for NEET-PG:** * **Investigation of Choice:** Impedance Audiometry (Tympanometry). * **Classic Finding:** **Type B (Flat) Tympanogram** with normal ear canal volume. * **Otoscopy:** Dull, retracted tympanic membrane with loss of light reflex; "air-bubbles" or an air-fluid level may be visible. * **Treatment of Choice:** Initially medical (observation/nasal decongestants); if persistent (>3 months) or causing speech delay, **Myringotomy with Grommet insertion** is indicated. * **Most common site for Grommet:** Antero-inferior quadrant of the tympanic membrane.

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.

Question 1

External auditory canal atresia has been associated with all of the following except?

Accepted Answer

Polyhydramnios

Answer

Low birth weight

Answer

Intrauterine infections

Answer

Intrauterine toxins

Question 2

The pressure difference that can cause atmosphere and middle ear barotrauma is:

Accepted Answer

> 90 mmHg

Answer

60 mmHg

Answer

60 - 70 mmHg

Answer

70-80 mmHg

Question 3

Lateral sinus thrombosis is associated with all of the following except:

Accepted Answer

Gradenigo triad

Answer

Griesinger's sign

Answer

Crowe-Beck sign

Answer

Tobey-Ayer test

Question 4

What is the most common cause of bilateral conductive deafness in a child?

Accepted Answer

Otitis media with effusion (OME)

Answer

Otosclerosis

Answer

Acute otitis media

Answer

Congenital cholesteatoma

Question 5

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 6

What is the diagnosis?

Accepted Answer

Exostosis

Answer

Otitis externa

Answer

Keratosis obturans

Answer

Cerumen

Question 7

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 8

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 9

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 10

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

Diseases of the Ear — MCQs

Diseases of the Ear — MCQs

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