Otology — MCQs

Otology Indian Medical PG Practice Questions and MCQs

Question 191: Which of the following statements about myringotomy is false?

A. It is a surgical opening in the tympanic membrane.
B. It is typically done in the postero-inferior quadrant.
C. It is indicated even if a slight bulge of the tympanic membrane is seen. (Correct Answer)
D. It heals without any scar.

Explanation: **Explanation:** **1. Why Option C is the correct (False) statement:** Myringotomy is not indicated for a "slight bulge." In cases of Acute Otitis Media (AOM), the primary management is medical (antibiotics and decongestants). Myringotomy is a surgical intervention reserved for specific indications: **severe** bulging of the tympanic membrane (impending rupture), excruciating pain, high-grade fever, or complications like facial nerve palsy or mastitis. A slight bulge usually resolves with medical therapy alone. **2. Analysis of other options:** * **Option A:** This is the definition of myringotomy—a deliberate incision made in the tympanic membrane to drain pus or fluid from the middle ear. * **Option B:** The **postero-inferior quadrant** is the preferred site for incision. This area provides the easiest access to the middle ear space while avoiding vital structures like the ossicles (incus and stapes) and the chorda tympani nerve, which are located in the superior quadrants. * **Option D:** When performed with a sharp, clean incision, the tympanic membrane has remarkable regenerative powers and typically heals rapidly without leaving a visible scar or permanent perforation. **Clinical Pearls for NEET-PG:** * **Incision Shape:** A 'J' or 'U' shaped incision is often used for AOM (to facilitate drainage), while a radial incision is preferred for Serous Otitis Media (to insert a ventilation tube/Grommet). * **Grommet Insertion:** The most common site for Grommet insertion is the **antero-inferior quadrant**. * **Main Indication:** The most common indication for myringotomy today is Otitis Media with Effusion (Glue Ear) resistant to medical treatment.

Question 192: Schwartz operation is performed for which condition?

A. Chronic suppurative otitis media (CSOM)
B. Serous otitis media
C. Otosclerosis
D. Acute mastoiditis (Correct Answer)

Explanation: **Explanation:** **Schwartz Operation**, also known as **Simple Mastoiditis** or **Cortical Mastoiditis**, is the surgical procedure of choice for **Acute Mastoiditis** that fails to respond to medical management. 1. **Why it is correct:** The goal of the Schwartz operation is to exenterate all accessible mastoid air cells and remove infected bone/pus while preserving the anatomy of the external auditory canal and the middle ear (ossicles and tympanic membrane). It converts the mastoid into a single cavity to ensure drainage, which is the definitive treatment for coalescent mastoiditis. 2. **Why other options are incorrect:** * **CSOM:** This usually requires a **Radical or Modified Radical Mastoiditis** (MRM) to address cholesteatoma or permanent middle ear damage. * **Serous Otitis Media:** This is managed by **Myringotomy** with or without **Grommet insertion** to ventilate the middle ear. * **Otosclerosis:** The surgical treatment is **Stapedotomy** or Stapedectomy to restore ossicular mobility. (Note: Do not confuse *Schwartz operation* with *Schwartz sign*, which is the flamingo-pink flush seen on the promontory in active otosclerosis). **High-Yield Clinical Pearls for NEET-PG:** * **Indications:** Coalescent mastoiditis, masked mastoiditis, or as a preliminary step in Endolymphatic sac surgery or Cochlear implantation. * **Boundaries of MacEwen’s Triangle (Suprameatal Triangle):** This is the surgical landmark for the mastoid antrum. It is bounded by the Suprameatal crest (superiorly), Posterosuperior segment of the external bony meatus (anteriorly), and a tangent drawn to the meatus (posteriorly). * **Key Landmark:** The **Henle’s spine** is a critical bony landmark located at the anterosuperior margin of the triangle.

Question 193: What is the angle that the tympanic membrane makes with the floor of the external auditory meatus?

A. 15 degrees
B. 25 degrees
C. 45 degrees
D. 55 degrees (Correct Answer)

Explanation: ### Explanation **1. Understanding the Correct Answer (D: 55 degrees)** The tympanic membrane (TM) is not positioned vertically within the ear canal. Instead, it is set obliquely at an angle of approximately **55 degrees** with the floor of the external auditory meatus (EAM). This anatomical tilt is significant because it increases the surface area of the membrane available for sound collection compared to a strictly vertical orientation. Because of this obliquity, the anterior and inferior walls of the EAM are longer than the posterior and superior walls. **2. Analysis of Incorrect Options** * **A, B, and C:** These values are significantly lower than the anatomical standard. While the angle may vary slightly between individuals or in different developmental stages (it is much more horizontal in neonates), 55 degrees is the established textbook value for the adult human ear. An angle of 45 degrees is a common distractor, but it underestimates the actual tilt. **3. Clinical Pearls & High-Yield Facts for NEET-PG** * **Neonatal Anatomy:** In newborns, the tympanic membrane is almost horizontal. This is a high-yield distinction; as the bony canal develops, the membrane assumes its more vertical (55°) adult position. * **The Cone of Light:** Due to the obliquity of the TM and its concavity (at the umbo), light from an otoscope is reflected antero-inferiorly. * **Anterior Recess:** The acute angle formed between the TM and the floor of the EAM creates a "recess" where small foreign bodies or debris can become lodged, making them difficult to visualize or remove. * **Dimensions:** The TM is roughly oval, measuring about 9–10 mm tall and 8–9 mm wide, with a thickness of approximately 0.1 mm.

Question 194: What is the earliest sign seen in Acoustic neuroma?

A. Facial weakness
B. Unilateral deafness
C. Reduced corneal reflex (Correct Answer)
D. Cerebellar signs

Explanation: ### Explanation **1. Why "Reduced corneal reflex" is correct:** Acoustic neuroma (Vestibular Schwannoma) typically arises from the vestibular portion of the **VIIIth cranial nerve** within the internal auditory canal. As the tumor expands into the cerebellopontine (CP) angle, it first encounters the **Vth cranial nerve (Trigeminal)**. The Trigeminal nerve is highly sensitive to pressure. Loss or reduction of the corneal reflex (mediated by the ophthalmic division of CN V) is clinically recognized as the **earliest objective clinical sign** of acoustic neuroma, often occurring before the patient notices significant sensory loss on the face. **2. Why other options are incorrect:** * **Facial weakness (CN VII):** Although the VIIth nerve is anatomically adjacent to the VIIIth nerve, it is remarkably resistant to pressure. Facial weakness is usually a **late sign**, occurring only when the tumor is very large. * **Unilateral deafness:** While progressive sensorineural hearing loss is often the **earliest symptom** reported by the patient, "Reduced corneal reflex" is considered the earliest **sign** (objective finding on examination) as the tumor exits the internal meatus. * **Cerebellar signs:** These (e.g., ataxia, dysmetria) occur much later in the disease progression once the tumor is large enough to compress the cerebellum or brainstem. **3. Clinical Pearls for NEET-PG:** * **Earliest Symptom:** Progressive, unilateral sensorineural hearing loss (SNHL) and high-pitched tinnitus. * **Earliest Sign:** Reduced corneal reflex. * **Gold Standard Investigation:** Gadolinium-enhanced MRI (shows "ice-cream cone" appearance). * **Hitselberger’s Sign:** Hypesthesia of the posterior meatal wall (due to CN VII sensory fiber compression); also an early sign. * **Audiometry:** Characterized by "Roll-over phenomenon" and poor speech discrimination scores out of proportion to pure tone loss.

Question 195: What is not true about auricular hematoma?

A. All cases should receive antibiotics.
B. Commonly seen in rugby players.
C. Resolves spontaneously. (Correct Answer)
D. All of the above.

Explanation: **Explanation:** **Auricular Hematoma** (also known as Othematoma) is a collection of blood between the perichondrium and the auricular cartilage, typically resulting from blunt trauma. **Why Option C is the correct answer (What is NOT true):** Auricular hematomas **do not resolve spontaneously**. Because the cartilage depends on the overlying perichondrium for its blood supply, an untreated hematoma creates a barrier that leads to ischemic necrosis of the cartilage. If left alone, the hematoma undergoes organization and fibrosis, resulting in the permanent deformity known as **"Cauliflower Ear."** Therefore, active surgical intervention (aspiration or incision and drainage) is mandatory. **Analysis of other options:** * **Option A (True):** Antibiotics are routinely prescribed to prevent **Perichondritis**, a serious complication that can lead to further cartilage destruction. * **Option B (True):** It is an occupational hazard for athletes involved in contact sports like **rugby, wrestling, and boxing** due to repeated shearing trauma to the pinna. **High-Yield Clinical Pearls for NEET-PG:** 1. **Management:** Small hematomas can be aspirated with a wide-bore needle; large or recurrent ones require **Incision and Drainage (I&D)** followed by a pressure dressing (to prevent re-accumulation). 2. **Complication:** The most common late complication of an untreated hematoma is **Cauliflower Ear** (Boxer’s ear). 3. **Site:** It most commonly occurs on the anterior (lateral) surface of the pinna where the skin is tightly bound to the perichondrium.

Question 196: Which of the following is NOT a characteristic of Gradenigo's syndrome?

A. Retroorbital pain
B. Profuse discharge from the ear
C. VII nerve palsy (Correct Answer)
D. Diplopia

Explanation: **Gradenigo’s Syndrome** (also known as Gradenigo-Lannois syndrome) is a classic clinical triad resulting from **Petrositis**—the extension of infection from the middle ear/mastoid into the air cells of the petrous apex. ### **Explanation of the Correct Answer** * **C. VII nerve palsy:** This is the correct answer because the facial nerve (CN VII) is **not** part of the classic Gradenigo’s triad. While facial nerve palsy can occur in chronic suppurative otitis media (CSOM) or malignant otitis externa, it is not a defining feature of petrositis. The syndrome specifically involves structures near the **petrous apex** (Dorello’s canal and the trigeminal ganglion). ### **Analysis of Incorrect Options (The Triad)** * **A. Retroorbital pain:** Caused by irritation of the **Trigeminal nerve (CN V)**, specifically the ophthalmic division, as it sits in Meckel’s cave near the petrous apex. * **B. Profuse discharge from the ear:** Persistent **otorrhea** is a hallmark of the underlying suppurative clinically active ear infection (mastoiditis/petrositis). * **D. Diplopia:** This occurs due to **Abducens nerve (CN VI) palsy**. The 6th nerve is vulnerable as it passes through **Dorello’s canal**, a narrow space beneath the petrosphenoid ligament. This leads to paralysis of the lateral rectus muscle and subsequent horizontal diplopia. ### **High-Yield Clinical Pearls for NEET-PG** * **The Triad:** 1. Otorrhea, 2. Retroorbital pain (CN V), 3. Diplopia (CN VI). * **Anatomy:** The abducens nerve is the most commonly affected cranial nerve in petrositis due to its long intracranial course and confinement in Dorello’s canal. * **Imaging:** Contrast-enhanced CT or MRI of the temporal bone is the gold standard to visualize opacification or bone destruction of the petrous apex. * **Management:** Intensive IV antibiotics and surgical drainage (e.g., cortical mastoidectomy with petrous apicectomy).

Question 197: What is the ideal site for myringotomy and grommet insertion?

A. Anterior superior quadrant
B. Anterior inferior quadrant (Correct Answer)
C. Posterior superior quadrant
D. Posterior inferior quadrant

Explanation: ### Explanation The ideal site for myringotomy and grommet insertion is the **Anterior Inferior Quadrant** of the tympanic membrane. #### Why the Anterior Inferior Quadrant? 1. **Safety:** This quadrant is the farthest from vital middle ear structures. The ossicular chain (incus and stapes) and the round window are located posteriorly. Placing a tube here minimizes the risk of accidental trauma to these structures. 2. **Eustachian Tube Alignment:** This site is closest to the opening of the Eustachian tube, facilitating better ventilation and drainage. 3. **Stability:** The grommet is less likely to be prematurely extruded by the migratory patterns of the tympanic membrane epithelium in this region compared to the posterior quadrants. #### Analysis of Incorrect Options: * **Posterior Superior Quadrant:** This is the most dangerous site. The incudostapedial joint and the stapes are located directly medial to this area. Injury here can cause ossicular dislocation or sensorineural hearing loss. * **Posterior Inferior Quadrant:** While sometimes used for simple myringotomy (e.g., for acute otitis media to allow drainage), it is avoided for grommet insertion because it lies over the round window niche. * **Anterior Superior Quadrant:** This area is technically difficult to access due to the overhang of the anterior meatal wall and is in close proximity to the Eustachian tube orifice, which may lead to earlier blockage of the tube. #### NEET-PG High-Yield Pearls: * **Indication:** The most common indication for grommet insertion is **Otitis Media with Effusion (Glue Ear)** that is non-responsive to medical management for 3 months. * **Incision Type:** A **radial incision** is preferred for grommet insertion (less bleeding, heals better), while a **circumferential (curved) incision** is traditionally used for simple myringotomy to allow wide drainage. * **Complication:** The most common long-term complication of grommet insertion is **tympanosclerosis** or a persistent perforation.

Question 198: A 10-year-old boy presents with torticollis, a tender swelling behind the angle of the mandible, and fever. He has a history of ear discharge for the past 6 years. Examination of the ear shows purulent discharge and granulations in the ear canal. What is the most probable diagnosis?

A. Acute lymphadenitis secondary to otitis externa
B. Masked mastoiditis
C. Bezold abscess (Correct Answer)
D. Parotitis

Explanation: **Explanation:** The clinical presentation of a long-standing ear discharge (6 years) and granulations in the ear canal suggests **Chronic Suppurative Otitis Media (CSOM)**, likely of the squamosal type. The development of fever, torticollis, and a tender swelling below the mastoid process indicates an extracranial complication. **Why Bezold Abscess is correct:** A Bezold abscess occurs when mastoiditis leads to pus eroding through the thin inner table of the **mastoid tip** at the notch of the digastric muscle. The pus tracks down into the **sternocleidomastoid (SCM) sheath**. This causes a deep neck swelling behind the angle of the mandible and triggers irritation of the SCM muscle, leading to **torticollis** (wry neck). **Why the other options are incorrect:** * **Acute lymphadenitis:** While it causes neck swelling, it would not typically present with a 6-year history of ear discharge and granulations, which point toward a deeper mastoid complication. * **Masked mastoiditis:** This refers to a latent infection of the mastoid air cells where symptoms are suppressed (often by inadequate antibiotics), but the tympanic membrane remains relatively normal. It does not typically present with a neck mass and torticollis. * **Parotitis:** This involves swelling of the parotid gland (anterior to the ear/mandible) and would not be caused by chronic middle ear pathology or result in torticollis. **NEET-PG High-Yield Pearls:** * **Bezold Abscess:** Pus tracks into the SCM sheath. * **Citelli’s Abscess:** Pus tracks into the posterior belly of the digastric muscle (swelling in the digastric triangle). * **Luc’s Abscess:** Subperiosteal abscess related to the external auditory canal wall. * **Gruber’s Test:** Used to differentiate between a Bezold abscess and other neck swellings (pressure on the abscess may cause ear discharge).

Question 199: Which of the following surgical procedures is performed in cases of otosclerosis?

A. Stapedectomy
B. Fenestration
C. Stapedotomy
D. All of the above (Correct Answer)

Explanation: **Explanation:** Otosclerosis is a localized disease of the otic capsule characterized by abnormal bone remodeling, most commonly leading to fixation of the stapes footplate and resulting in progressive conductive hearing loss. The primary goal of surgery is to bypass this fixation to restore sound conduction to the inner ear. **Why "All of the above" is correct:** Historically and currently, several procedures have been developed to address stapes fixation: * **Fenestration:** This was the historical procedure (pioneered by Lempert) where a new window was created in the lateral semicircular canal to bypass the fixed stapes. While largely obsolete today due to the cavity problems it created, it remains a surgically valid procedure for otosclerosis in specific anatomical variations. * **Stapedectomy:** Introduced by Shea, this involves the total or partial removal of the fixed stapes footplate and replacing it with a prosthesis. * **Stapedotomy:** The modern "gold standard." It involves creating a small hole (fenestra) in the footplate using a drill or laser and placing a piston-style prosthesis. It is preferred over stapedectomy as it carries a lower risk of inner ear trauma and better high-frequency sound preservation. **Clinical Pearls for NEET-PG:** * **Schwartze Sign (Flamingo Flush):** An active focus of otosclerosis seen as a reddish hue over the promontory. * **Carhart’s Notch:** A characteristic dip in the bone conduction threshold at **2000 Hz**, which disappears after successful surgery. * **Gelle’s Test:** Negative in otosclerosis (indicates fixed ossicular chain). * **Contraindication:** Surgery should not be performed if there is an active infection, in the only hearing ear, or during active Schwartze sign (relative contraindication).

Question 200: A 60-year-old man presented with left-sided ear discharge for 7 years accompanied by dull earache. On examination, the tympanic membrane is intact on both sides, and a mass is seen on the posterior canal wall on the left side. What is the most likely diagnosis?

A. Keratosis obturans (Correct Answer)
B. Chronic suppurative otitis media (CSOM)
C. External otitis
D. Carcinoma of the external auditory canal

Explanation: **Explanation:** The clinical presentation of long-standing ear discharge, dull pain, an **intact tympanic membrane (TM)**, and a **mass on the posterior canal wall** in an older patient is classic for **Keratosis Obturans**. **Why Keratosis Obturans is correct:** Keratosis obturans is caused by the accumulation of desquamated keratin scales in the external auditory canal (EAC). Unlike Cholesteatoma, it typically presents with an intact TM. The "mass" described is the keratin plug. Over time, the pressure from this accumulation causes **ballooning of the bony canal** and pressure necrosis, leading to a dull, deep-seated ache and chronic discharge. **Why the other options are incorrect:** * **CSOM:** This diagnosis requires a **perforated tympanic membrane**. The question explicitly states the TM is intact, ruling out CSOM. * **External Otitis:** This is usually an acute, painful inflammatory condition. While it causes discharge, it does not typically present as a localized mass on the posterior wall or persist for 7 years without acute exacerbations. * **Carcinoma of the EAC:** While it can present with pain and discharge in older patients, it usually presents as a friable, bleeding mass or ulcer rather than a keratinous plug, and is often associated with rapid progression and cranial nerve palsies. **High-Yield Clinical Pearls for NEET-PG:** * **Keratosis Obturans vs. Canal Cholesteatoma:** Keratosis obturans involves **circumferential** keratin accumulation and canal widening, often associated with bronchiectasis or sinusitis. Canal Cholesteatoma involves **localized** bone erosion (usually the floor) with a sequestration of bone. * **Triad of Keratosis Obturans:** Severe pain, conductive hearing loss, and a widened bony EAC. * **Management:** Repeated syringing or manual removal of the keratin plug under microscopy.

Practice by Chapter

Tympanic Membrane Perforation

Practice Questions

Cholesteatoma

Practice Questions

Tympanoplasty Techniques

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Ossicular Chain Reconstruction

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Mastoidectomy

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Stapedectomy

Practice Questions

Implantable Hearing Devices

Practice Questions

Congenital Aural Atresia

Practice Questions

Otologic Trauma

Practice Questions

Glomus Tumors

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Facial Nerve Decompression

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Rehabilitative Audiology

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Otology — MCQs

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