Otology Practice Questions

Q: A child presents with glue ear, following otitis media two weeks prior. What is the treatment of choice for glue ear?

Myringotomy with ventilation tube insertion. **Explanation:** **Glue Ear (Otitis Media with Effusion - OME)** is characterized by the accumulation of non-purulent, sterile fluid in the middle ear cleft, leading to conductive hearing loss. **1. Why Option C is Correct:** The definitive surgical treatment for persistent or symptomatic glue ear is **Myringotomy with Ventilation Tube (Grommet) insertion**. The grommet serves two primary functions: it bypasses the dysfunctional Eustachian tube to provide continuous ventilation to the middle ear and allows for the drainage/aspiration of the thick "glue-like" secretions. This restores middle ear pressure and improves hearing immediately. **2. Why Other Options are Wrong:** * **Option A & B:** Myringotomy alone (whether by cold knife or laser) provides only temporary relief. Without a ventilation tube, the incision typically heals within 48–72 hours, leading to the re-accumulation of fluid if the underlying Eustachian tube dysfunction persists. * **Option D:** While conservative management (watchful waiting) is often the *initial* step for 3 months, the question asks for the "treatment of choice" for the established condition. Antibiotics are generally ineffective because the fluid in OME is typically sterile and not an active infection. **Clinical Pearls for NEET-PG:** * **Most common cause of hearing loss in children:** Otitis Media with Effusion. * **Tympanogram Finding:** Characteristically shows a **Type B (Flat) curve**. * **Most common site for Myringotomy:** Antero-inferior quadrant (to avoid injury to the ossicles and chorda tympani). * **Indication for Adenoidectomy:** Often performed alongside grommet insertion if the child has adenoid hypertrophy causing Eustachian tube obstruction.

Q: The fistula test stimulates which of the following structures?

Lateral semicircular canal. **Explanation:** The **fistula test** is a clinical procedure used to identify an abnormal communication (fistula) between the inner and middle ear. **Why the Lateral Semicircular Canal is Correct:** The test involves applying positive and negative pressure to the external auditory canal using a Siegle’s speculum. In the presence of a bony erosion (most commonly caused by **cholesteatoma**), this pressure is transmitted to the endolymph of the inner ear. The **Lateral Semicircular Canal (LSCC)** is the most common site for a fistula because of its anatomical proximity to the aditus and antrum, where cholesteatomas typically expand. The pressure change induces endolymph movement, stimulating the crista ampullaris and resulting in vertigo and nystagmus (Hennebert’s sign). **Why Other Options are Incorrect:** * **Posterior and Anterior Semicircular Canals:** While these are part of the vestibular system, they are located deeper within the petrous temporal bone and are rarely involved in chronic suppurative otitis media (CSOM) compared to the LSCC. * **Round Window:** Pressure changes at the round window are physiological (part of normal sound conduction). A "fistula" here usually refers to a perilymph fistula (often post-traumatic), but the classic "fistula test" in ENT exams specifically refers to LSCC erosion by cholesteatoma. **High-Yield Clinical Pearls for NEET-PG:** * **Hennebert’s Sign:** A "false positive" fistula test (nystagmus without a bony fistula). Seen in **Meniere’s disease** (fibrosis between stapes footplate and saccule) and **Congenital Syphilis**. * **False Negative Test:** May occur if the fistula is plugged by cholesteatoma/granulations or if the labyrinth is "dead" (non-functional). * **Management:** A positive fistula test is a surgical indication, usually requiring a Modified Radical Mastoidectomy.

Q: All of the following diseases have a consistent symptom of tinnitus, except?

Mastoiditis. **Explanation:** The correct answer is **Mastoiditis**. **1. Why Mastoiditis is the correct answer:** Mastoiditis is an acute inflammatory process of the mastoid air cells, typically occurring as a complication of Acute Otitis Media (AOM). Its hallmark clinical features are **exudative ear discharge, post-auricular pain, tenderness, and swelling (mastoid flare)**. While a patient may experience a dull sense of hearing loss, **tinnitus is not a consistent or defining symptom** of this acute bacterial infection. The clinical focus is on systemic signs of infection and local abscess formation rather than auditory phantom sounds. **2. Analysis of incorrect options:** * **Meniere’s Disease:** Characterized by the classic triad of episodic vertigo, sensorineural hearing loss, and **low-pitched roaring tinnitus**. Tinnitus is a core diagnostic criterion. * **Otosclerosis:** This condition involves abnormal bone remodeling in the middle ear. It consistently presents with progressive conductive hearing loss and **tinnitus** (often described as a hissing or rushing sound) in about 75% of cases. * **CSOM:** Chronic inflammation of the middle ear and mastoid often presents with persistent ear discharge and hearing loss. **Tinnitus** is a very common secondary symptom due to the chronic irritation of the ossicular chain or inner ear (labyrinthitis). **High-Yield Clinical Pearls for NEET-PG:** * **Pulsatile Tinnitus:** Highly suggestive of vascular tumors like **Glomus Jugulare**. * **Clicking Tinnitus:** Often associated with **Palatal Myoclonus**. * **Schwartze Sign:** A flamingo-pink flush on the promontory seen in active Otosclerosis. * **Bezold’s Abscess:** A complication of mastoiditis where pus tracks down into the sternocleidomastoid muscle.

Q: What is the distance of the promontory from the tympanic membrane?

2 mm. **Explanation:** The middle ear cavity (tympanic cavity) is shaped like a biconcave disc, being narrowest at its center due to the inward bulging of the tympanic membrane (the umbo) and the outward bulging of the medial wall (the promontory). 1. **Why 2 mm is correct:** The distance between the tympanic membrane and the medial wall (promontory) varies across the cavity. At the **center (mesotympanum)**, the distance is at its minimum, measuring approximately **2 mm**. This is a high-yield anatomical fact often tested to emphasize the narrowness of the middle ear space. 2. **Why the other options are wrong:** * **6 mm:** This is the distance at the **roof (epitympanum)** of the middle ear. * **4 mm:** (Though not an option, it is a common distractor) This is the distance at the **floor (hypotympanum)**. * **5 mm and 7 mm:** These values do not correspond to the standard anatomical dimensions of the middle ear width. **Clinical Pearls & High-Yield Facts for NEET-PG:** * **The Promontory:** It is a rounded projection on the medial wall formed by the **basal turn of the cochlea**. * **Jacobson’s Nerve:** The tympanic branch of the Glossopharyngeal nerve (CN IX) lies in a groove on the surface of the promontory. * **Dimensions of Middle Ear:** Remember the "6-2-4" rule for the width of the tympanic cavity: 6 mm at the top, 2 mm at the center, and 4 mm at the bottom. * **Vertical and Anteroposterior diameters:** Both are approximately 15 mm. * **Clinical Significance:** The narrow 2 mm gap explains why even small middle ear effusions or masses (like a glomus tumor) can easily come into contact with the tympanic membrane.

Q: Which of the following statements about ototoxicity is FALSE?

Low frequency hearing loss occurs initially. Ototoxicity typically presents as **bilateral, symmetrical, sensorineural hearing loss (SNHL)**. The hallmark of ototoxic damage is that it affects the **basal turn of the cochlea** first, which is responsible for processing **high-frequency sounds**. ### Explanation of Options: * **Option B (Correct Answer):** This is false because ototoxicity characteristically begins at high frequencies (8,000–20,000 Hz). Patients often do not notice early damage until it progresses to the lower frequencies involved in speech. * **Option A:** Ototoxicity is a systemic effect; therefore, it almost always causes bilateral and symmetrical hearing loss. * **Option C:** Aminoglycosides (e.g., Gentamicin, Amikacin) cause the death of outer hair cells in the Organ of Corti. Since these cells do not regenerate, the resulting hearing loss is permanent. * **Option D:** Prevention is the primary management strategy. Monitoring drug levels (TDM) and withdrawing or substituting the offending agent at the first sign of toxicity (tinnitus or high-frequency loss on serial audiometry) can prevent further progression. ### High-Yield Clinical Pearls for NEET-PG: * **Aminoglycoside Specificity:** Gentamicin and Streptomycin are more **vestibulotoxic** (causing vertigo/disequilibrium), while Amikacin, Neomycin, and Kanamycin are more **cochleotoxic** (causing hearing loss). * **Loop Diuretics:** (e.g., Furosemide) cause reversible hearing loss by affecting the *stria vascularis*. * **Salicylates:** Cause reversible SNHL and are classically associated with high-pitched tinnitus. * **Cisplatin:** A common chemotherapeutic agent that causes significant, permanent high-frequency SNHL. * **Monitoring:** High-frequency audiometry is the most sensitive tool for early detection.

Q: Which of the following best describes glue ear?

It is typically painless.. **Explanation:** **Glue ear**, medically known as **Otitis Media with Effusion (OME)**, is characterized by the accumulation of non-purulent, mucoid, or serous fluid in the middle ear cleft without signs of acute infection. 1. **Why Option B is correct:** Unlike Acute Otitis Media (AOM), glue ear is **typically painless**. The primary symptom is **conductive hearing loss** (the most common cause of hearing loss in children). Because there is no active bacterial suppuration or pressure from pus, patients do not experience otalgia or fever. 2. **Why the other options are incorrect:** * **Option A:** Pain is a hallmark of Acute Otitis Media or Otitis Externa, not OME. * **Option C:** Radical mastoidectomy is an aggressive surgery for cholesteatoma. The primary surgical treatment for glue ear is **Myringotomy with Grommet (ventilation tube) insertion**, often combined with an adenoidectomy if indicated. * **Option D:** Sodium fluoride is used to stabilize active bony resorption in **Otosclerosis** (Schwartze sign), not for middle ear effusions. **High-Yield Clinical Pearls for NEET-PG:** * **Etiology:** Often associated with **Eustachian tube dysfunction** or adenoid hypertrophy. * **Diagnosis:** The gold standard for diagnosis is **Tympanometry**, which typically shows a **Type B (flat) curve**. * **Otoscopy:** Findings include a dull, retracted tympanic membrane with restricted mobility (assessed via pneumatic otoscopy). An "amber-colored" drum or air-fluid bubbles may be seen. * **Management:** Initial management is usually observation (watchful waiting for 3 months) as many cases resolve spontaneously. If persistent, Myringotomy is performed in the **antero-inferior quadrant**.

Question 1

What is true about the Eustachian tube?

Accepted Answer

It has a higher elastin content in adults.

Answer

Its length is 36 mm in adults and 1.6 mm to 3 mm in children.

Answer

The ventilatory function of the ear is better developed in infants.

Answer

It is more horizontal in adults.

Question 2

A child presents with glue ear, following otitis media two weeks prior. What is the treatment of choice for glue ear?

Accepted Answer

Myringotomy with ventilation tube insertion

Answer

Myringotomy with cold knife

Answer

Myringotomy with diode laser

Answer

Conservative treatment with analgesics and antibiotics

Question 3

The fistula test stimulates which of the following structures?

Accepted Answer

Lateral semicircular canal

Answer

Posterior semicircular canal

Answer

Round window

Answer

Anterior semicircular canal

Question 4

All of the following diseases have a consistent symptom of tinnitus, except?

Accepted Answer

Mastoiditis

Answer

Meniere's disease

Answer

Chronic suppurative otitis media (CSOM)

Answer

Otosclerosis

Question 5

What is the distance of the promontory from the tympanic membrane?

Accepted Answer

2 mm

Answer

5 mm

Answer

6 mm

Answer

7 mm

Question 6

Radical mastoidectomy is indicated in:

Accepted Answer

Coalescent mastoiditis

Answer

Cholesteatoma without complication

Answer

Chronic suppurative otitis media with brain abscess

Answer

Perforation in Pars flaccida

Question 7

Which of the following statements about ototoxicity is FALSE?

Accepted Answer

Low frequency hearing loss occurs initially

Answer

Causes bilateral hearing loss

Answer

Aminoglycosides cause permanent hearing loss

Answer

Can be prevented by withdrawing the drug

Question 8

A 70-year-old male with long-standing type 2 diabetes mellitus presents with a complaint of left ear pain and purulent drainage. Examination reveals a tender pinna of the left ear, with a swollen and edematous external auditory canal. The patient is afebrile and has a normal white blood cell count. What is the most likely organism to grow from the ear drainage?

Accepted Answer

P. aeruginosa

Answer

Staphylococcus aureus

Answer

Candida albicans

Answer

Haemophilus influenzae

Question 9

Which of the following best describes glue ear?

Accepted Answer

It is typically painless.

Answer

It is typically painful.

Answer

Radical mastoidectomy is the primary treatment.

Answer

Sodium fluoride is a useful treatment.

Question 10

A girl presented with chronic ear discharge, pain on ocular movements, and vertigo, and underwent mastoidectomy. Postoperatively, there was no relief and continuous purulent ear discharge persisted. The patient also had sensorineural hearing loss. What is the most probable diagnosis?

Accepted Answer

Apical petrositis

Answer

Suppurative labyrinthitis

Answer

Serous labyrinthitis

Answer

Lateral sinus thrombophlebitis

Otology — MCQs

Otology — MCQs

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