Otology — MCQs

Otology Indian Medical PG Practice Questions and MCQs

Question 111: Radical mastoidectomy includes all except:

A. Closure of the auditory tube
B. Ossicles removed
C. Cochlea removed (Correct Answer)
D. Exteriorisation of mastoid

Explanation: **Explanation:** Radical Mastoidectomy is a surgical procedure performed for extensive cholesteatoma or neoplasms where the goal is to create a common cavity involving the external auditory canal, middle ear, and mastoid antrum. **Why "Cochlea removed" is the correct answer:** The primary objective of a radical mastoidectomy is to eliminate disease while **preserving the inner ear structures** (cochlea and labyrinth) to prevent total sensorineural deafness and vertigo. Removing the cochlea (Labyrinthine ablation) is not part of a standard mastoidectomy; it is only done in specific procedures like a Labyrinthectomy for intractable Meniere’s disease or during certain skull base surgeries. **Analysis of Incorrect Options:** * **Closure of the auditory tube (Eustachian tube):** In a radical mastoidectomy, the middle ear mucosa and the Eustachian tube orifice are obliterated to prevent persistent mucus discharge from the nasopharynx into the mastoid cavity. * **Ossicles removed:** All remnants of the tympanic membrane and ossicles (except the stapes footplate, which is left to protect the oval window) are removed to ensure all disease is cleared. * **Exteriorisation of mastoid:** This is the core principle of the procedure. The posterior meatal wall is removed (canal wall down), converting the mastoid air cells, antrum, and middle ear into a single, easily accessible exteriorized cavity. **Clinical Pearls for NEET-PG:** * **Structures Preserved:** Stapes footplate, Facial nerve canal, and the Inner ear (Cochlea/Labyrinth). * **Indication:** Usually reserved for cases where hearing reconstruction is impossible or in malignant tumors of the middle ear. * **Modified Radical Mastoidectomy (Bondy’s):** Unlike the radical version, this procedure aims to **preserve hearing** by leaving the tympanic membrane and ossicular remnants intact.

Question 112: A patient with chronic suppurative otitis media (CSOM) has cholesteatoma and presents with vertigo. What is the treatment of choice?

A. Antibiotics and labyrinthine sedative
B. Myringoplasty
C. Immediate mastoid exploration (Correct Answer)
D. Labyrinthectomy

Explanation: **Explanation:** The presence of vertigo in a patient with **Cholesteatoma (Attico-antral CSOM)** is a clinical red flag indicating a complication, most commonly a **Labyrinthine Fistula** (usually involving the lateral semicircular canal). **1. Why "Immediate Mastoid Exploration" is correct:** Cholesteatoma is an osteolytic process. When it erodes the bony labyrinth, it exposes the underlying endosteum, leading to vertigo (especially with pressure changes). This is a surgical emergency because the fistula acts as a gateway for infection to spread from the middle ear to the inner ear (causing permanent sensorineural hearing loss) or intracranial structures (causing meningitis or brain abscess). The primary goal is to surgically remove the disease, exteriorize the fistula, and prevent life-threatening complications. **2. Why other options are incorrect:** * **Antibiotics and labyrinthine sedatives:** These are supportive measures. They may mask symptoms but do not address the underlying bone-eroding pathology. * **Myringoplasty:** This is a simple repair of the tympanic membrane, usually performed for mucosal (safe) CSOM. It is insufficient for cholesteatoma or its complications. * **Labyrinthectomy:** This is a destructive procedure that results in total loss of hearing and vestibular function. It is reserved for non-serviceable ears with intractable vertigo or dead labyrinths, not as a primary treatment for a fistula. **High-Yield Clinical Pearls for NEET-PG:** * **Fistula Test:** A clinical test where pressure is applied to the tragus or via a Siegle’s speculum. A positive test (nystagmus/vertigo) confirms a labyrinthine fistula. * **Most Common Site:** The **Lateral (Horizontal) Semicircular Canal** is the most common site for a fistula due to its proximity to the aditus and antrum. * **Management:** Modified Radical Mastoidectomy (MRM) is the standard procedure to ensure all cholesteatoma matrix is removed while preserving as much function as possible.

Question 113: Citelli's angle is defined as:

A. Solid angle
B. CP angle
C. Sinodural angle (Correct Answer)
D. Part of Mac Evans triangle

Explanation: **Explanation:** **Citelli’s Angle (Sinodural Angle)** is a critical surgical landmark in otology, specifically during a cortical mastoidectomy. It is the angle formed by the junction of the **dural plate** (roof of the mastoid/middle fossa dura) and the **sinus plate** (covering the sigmoid sinus). 1. **Why Option C is correct:** Citelli’s angle represents the most posterosuperior limit of the mastoid exenteration. Identifying this angle is essential for the complete removal of air cells in the sinodural area and for safely exposing the superior bulb of the sigmoid sinus and the posterior fossa dura. 2. **Why other options are incorrect:** * **Option A (Solid Angle):** This is the angle formed by the junction of the three semicircular canals. It consists of dense bone and is located medial to the antrum. * **Option B (CP Angle):** The Cerebellopontine (CP) angle is a space in the posterior cranial fossa containing the CN VII and VIII. It is a site for tumors like Vestibular Schwannomas, not a mastoid surgical landmark. * **Option D (MacEwen’s Triangle):** Also known as the suprameatal triangle, this is the external surface landmark on the temporal bone used to locate the mastoid antrum. Citelli's angle is an internal deep landmark. **Clinical Pearls for NEET-PG:** * **Donaldson’s Line:** An imaginary line used to locate the endolymphatic sac; it passes posteriorly from the horizontal semicircular canal. * **Trautmann’s Triangle:** Bound by the sigmoid sinus, bony labyrinth, and superior petrosal sinus/dura. It is a gateway to the posterior cranial fossa. * **Körner’s Septum:** A persistent petrosquamosal suture that can mislead a surgeon into thinking the antrum has been reached.

Question 114: Gradenigo's syndrome is characterized by all except?

A. Retro-orbital pain
B. Abducent nerve involvement
C. Conductive deafness
D. Positive Griesinger sign (Correct Answer)

Explanation: **Gradenigo’s Syndrome** is a classic clinical triad resulting from **Petrositis** (infection of the petrous apex), usually occurring as a complication of chronic suppurative otitis media (CSOM). ### Why "Positive Griesinger sign" is the Correct Answer **Griesinger’s sign** refers to edema and tenderness over the mastoid process due to thrombosis of the **mastoid emissary vein**. It is a pathognomonic clinical feature of **Lateral (Sigmoid) Sinus Thrombosis**, not Gradenigo’s syndrome. Therefore, it is the "except" in this list. ### Explanation of the Triad (Incorrect Options) Gradenigo’s syndrome is defined by the following triad, making options A, B, and C incorrect as they are standard features: 1. **Retro-orbital pain (Option A):** Caused by irritation of the **Trigeminal nerve (CN V)**, specifically the gasserian ganglion located in Meckel’s cave near the petrous apex. 2. **Abducent nerve involvement (Option B):** The **6th Cranial Nerve** passes through **Dorello’s canal** (under the petrosphenoid ligament). Inflammation at the petrous apex compresses this nerve, leading to lateral rectus palsy and diplopia. 3. **Otorrhoea/Conductive Deafness (Option C):** Since the syndrome arises from middle ear infections (Otitis Media), persistent ear discharge and conductive hearing loss are inherent to the clinical presentation. ### High-Yield Clinical Pearls for NEET-PG * **Anatomy:** Dorello’s canal is the most vulnerable site for the 6th nerve in petrositis. * **Imaging:** Contrast-enhanced CT or MRI is the investigation of choice to visualize bone destruction or abscess at the petrous apex. * **Management:** Aggressive intravenous antibiotics and surgical drainage (e.g., cortical or radical mastoidectomy with petrous apicectomy). * **Differential:** Do not confuse Griesinger’s sign (Sigmoid Sinus) with **Bezold’s abscess** (pus in the sternocleidomastoid muscle).

Question 115: Which of the following operations are performed in cases of otosclerosis?

A. Stapedectomy and Fenestration
B. Fenestration and Stapedotomy
C. Stapedectomy, Fenestration, and Stapedotomy (Correct Answer)
D. Fenestration, Stapedotomy, and Sacculotomy

Explanation: **Explanation:** Otosclerosis is a primary metabolic bone disease of the otic capsule characterized by abnormal bone remodeling, leading to fixation of the stapes footplate and resulting in conductive hearing loss. The surgical management aims to bypass this fixation to restore sound conduction to the inner ear. **Why Option C is Correct:** Historically and currently, three main surgical procedures have been used for otosclerosis: 1. **Fenestration:** The earliest successful procedure (pioneered by Lempert), where a new window was created in the lateral semicircular canal to bypass the fixed stapes. 2. **Stapedectomy:** Introduced by Shea, this involves the total or partial removal of the fixed stapes footplate and replacing it with a prosthesis. 3. **Stapedotomy:** The modern "gold standard," where a small hole is created in the footplate (using a drill or laser) to insert a piston. This is preferred over stapedectomy as it carries a lower risk of sensorineural hearing loss and vertigo. **Analysis of Other Options:** * **Options A and B** are incomplete as they omit one of the three established surgical modalities. * **Option D** is incorrect because **Sacculotomy** (Fick’s operation) is a procedure used for the management of **Meniere’s disease** (endolymphatic hydrops), not otosclerosis. **High-Yield Clinical Pearls for NEET-PG:** * **Schwartze Sign (Flamingo Flush):** Indicates active otosclerosis (otospongiosis) due to increased vascularity over the promontory. * **Carhart’s Notch:** A characteristic dip in the bone conduction threshold at **2000 Hz**, which disappears after successful stapes surgery. * **Gelle’s Test:** Negative in otosclerosis (no change in hearing with increased ear canal pressure). * **Contraindication:** Surgery should generally not be performed in the only hearing ear or in the presence of active infection.

Question 116: A patient with a history of head injury presents with unilateral conductive hearing loss. Examination reveals a normal and mobile tympanic membrane. What is the most likely cause for the deafness?

A. Collection of fluid in the middle ear
B. Otosclerosis
C. Dislocation of the incudostapedial joint (Correct Answer)
D. Acute suppurative otitis media

Explanation: ### Explanation The correct answer is **C. Dislocation of the incudostapedial joint.** **1. Why it is correct:** In a patient with a history of **head trauma** presenting with **unilateral conductive hearing loss (CHL)** and a **normal, mobile tympanic membrane**, ossicular chain disruption is the most probable diagnosis. The **incudostapedial joint** is the most vulnerable part of the ossicular chain because the incus is suspended between the firmly attached malleus and the stapes (which is fixed in the oval window). A traumatic blow can easily cause inertia-driven displacement of the incus, leading to joint separation. **2. Why the other options are incorrect:** * **A. Collection of fluid (Serous Otitis Media):** While this causes CHL, the tympanic membrane would typically appear retracted, dull, or show an air-fluid level/bubbles. It is rarely a direct consequence of head trauma. * **B. Otosclerosis:** This is a progressive, usually bilateral, hereditary metabolic bone disease. While it presents with CHL and a normal TM, it is not associated with trauma. * **D. Acute Suppurative Otitis Media (ASOM):** This presents with ear pain, fever, and an inflamed, bulging, or perforated tympanic membrane, which contradicts the "normal and mobile" finding in the question. **Clinical Pearls for NEET-PG:** * **Most common ossicular injury:** Incudostapedial joint dislocation. * **Second most common:** Dislocation of the incus (total). * **Audiometry Finding:** Traumatic ossicular disruption typically shows a large "Air-Bone Gap" (often >40-50 dB). * **Tympanometry:** Usually shows an **$A_d$ type curve** (high compliance) due to the loss of stiffness in the ossicular chain. * **Management:** Surgical reconstruction (Ossiculoplasty).

Question 117: Gradenigo's syndrome is due to:

A. Mastoiditis
B. Petrositis (Correct Answer)
C. Sigmoid sinus thrombophlebitis
D. Labyrinthitis

Explanation: **Explanation:** **Gradenigo’s Syndrome** is a classic clinical triad resulting from **Petrositis** (inflammation/infection of the petrous apex of the temporal bone). It typically occurs as a complication of chronic or acute otitis media where the infection spreads medially into the air cells of the petrous part of the temporal bone. The syndrome is defined by the following triad: 1. **Otorrhea:** Persistent ear discharge. 2. **Retro-orbital pain:** Due to irritation of the **Trigeminal nerve (CN V)** ganglion (Gasserian ganglion) in Meckel’s cave. 3. **Diplopia (Abducens palsy):** Due to involvement of the **Sixth cranial nerve (CN VI)** as it passes through **Dorello’s canal**, which lies in close proximity to the petrous apex. **Why other options are incorrect:** * **Mastoiditis:** While it is a common complication of otitis media, it involves the mastoid air cells and presents with post-auricular pain and swelling, not cranial nerve palsies. * **Sigmoid sinus thrombophlebitis:** Presents with "picket-fence" fever and features of raised intracranial pressure, but not the specific Gradenigo triad. * **Labyrinthitis:** Characterized by vertigo, nystagmus, and sensorineural hearing loss, but does not involve the V or VI cranial nerves. **High-Yield Clinical Pearls for NEET-PG:** * **Dorello’s Canal:** The anatomical site where the VI nerve is compressed in Petrositis. * **Investigation of Choice:** Contrast-enhanced MRI is superior for visualizing petrous apex lesions, though CT shows bone destruction. * **Treatment:** Aggressive intravenous antibiotics and surgical drainage (e.g., cortical mastoidectomy with petrous apicectomy).

Question 118: Grommet tube is used in which of the following conditions?

A. Secretory otitis media
B. Mucoid otitis media
C. Serous otitis media
D. All of the above (Correct Answer)

Explanation: ### Explanation The correct answer is **D. All of the above.** A **Grommet (Ventilation Tube)** is a tiny, hourglass-shaped tube inserted into the tympanic membrane via a myringotomy. Its primary function is to bypass a dysfunctional Eustachian tube, providing continuous ventilation to the middle ear and allowing for the drainage of accumulated fluids. **Why "All of the above" is correct:** The terms **Secretory Otitis Media (SOM)**, **Serous Otitis Media**, and **Mucoid Otitis Media** are often used interchangeably to describe **Otitis Media with Effusion (OME)**. While they represent a spectrum of the same disease process, they differ slightly in the consistency of the fluid: * **Serous:** Thin, watery, straw-colored fluid. * **Mucoid:** Thick, viscid, "glue-like" fluid (often called "Glue Ear"). * **Secretory:** A general term for any non-purulent fluid produced by the middle ear mucosa. Since a Grommet is the definitive surgical treatment for persistent OME regardless of the fluid's viscosity, it is indicated in all three conditions. **Clinical Pearls for NEET-PG:** * **Most common site for Myringotomy/Grommet:** Antero-inferior quadrant of the tympanic membrane (to avoid injury to the ossicular chain and the chorda tympani). * **Indications:** Persistent OME (>3 months), retracted tympanic membrane, or recurrent barotrauma. * **Complications:** The most common complication after grommet insertion is **post-operative otorrhea**. Long-term complications include tympanosclerosis or a persistent perforation. * **Mechanism:** It does not "drain" fluid by gravity; rather, it equalizes pressure, allowing the Eustachian tube to function and the middle ear mucosa to return to normal.

Question 119: The superior malleolar ligament connects which structures?

A. Malleus to incus
B. Head of malleus to the roof of the epitympanum (Correct Answer)
C. Incus to the fossa incudis
D. Malleus to the fossa incudis

Explanation: **Explanation:** The **Superior Malleolar Ligament** is one of the three ligaments that suspend the malleus within the middle ear cavity. It is a delicate band of fibers that extends from the **head of the malleus** to the **roof of the epitympanic recess** (tegmen tympani). Its primary function is to provide vertical stability to the ossicular chain. **Analysis of Options:** * **Option B (Correct):** This accurately describes the anatomical attachments. The ligament anchors the superior aspect of the malleus head to the bony roof of the middle ear. * **Option A:** The connection between the malleus and incus is the **incudomalleolar joint**, which is a synovial diarthrodial (saddle) joint, not a ligamentous connection. * **Option C:** The **posterior ligament of the incus** connects the short process of the incus to the **fossa incudis** (located in the posteroinferior part of the epitympanic recess). * **Option D:** There is no direct ligamentous connection between the malleus and the fossa incudis; the fossa incudis is specifically associated with the incus. **High-Yield NEET-PG Pearls:** 1. **Anterior Malleolar Ligament:** Connects the neck of the malleus to the petrotympanic fissure; it is the strongest malleolar ligament. 2. **Lateral Malleolar Ligament:** Connects the neck of the malleus to the notch of Rivinus. 3. **Axis of Rotation:** The ossicular chain rotates around an axis passing through the anterior ligament of the malleus and the posterior ligament of the incus. 4. **Clinical Significance:** These ligaments are crucial in maintaining the "lever action" of the ossicles, which contributes to the impedance matching mechanism of the middle ear.

Question 120: Pure-tone audiometry of a 30-year-old field worker shows Carhart's notch. What is the likely underlying condition?

A. Otosclerosis (Correct Answer)
B. Chronic suppurative otitis media
C. Meniere's disease
D. Acoustic neuroma

Explanation: **Explanation:** **Carhart’s Notch** is a classic audiometric finding characterized by a dip in the bone conduction threshold, most prominent at **2000 Hz**. This is a hallmark sign of **Otosclerosis**, a condition involving abnormal bone remodeling of the otic capsule, leading to stapes fixation. **Why Otosclerosis is correct:** In a normal ear, bone conduction (BC) results from both direct stimulation of the cochlea and the inertial vibration of the ossicular chain. When the stapes becomes fixed (as in otosclerosis), the normal resonance of the ossicular chain (which peaks around 2 kHz) is lost. This results in a "mechanical" drop in the BC threshold at 2000 Hz. Importantly, this is a **false sensorineural loss**; the notch often disappears after a successful stapedotomy. **Why other options are incorrect:** * **Chronic Suppurative Otitis Media (CSOM):** Typically presents with a conductive hearing loss (CHL) due to tympanic membrane perforation or ossicular necrosis, but it does not produce a specific notch at 2000 Hz. * **Meniere’s Disease:** Characterized by fluctuating sensorineural hearing loss (SNHL) that primarily affects **low frequencies** (rising audiogram) and is associated with vertigo and tinnitus. * **Acoustic Neuroma:** Presents with unilateral, high-frequency SNHL and poor speech discrimination scores. **NEET-PG High-Yield Pearls:** * **Schwartz Sign:** A "flamingo pink" flush on the promontory seen through the TM, indicating active otosclerosis (Otospongiosis). * **Gelle’s Test:** Negative in otosclerosis (indicates a fixed ossicular chain). * **Stapedial Reflex:** Typically absent or shows an "on-off" effect in early stages. * **Treatment of Choice:** Stapedotomy (using a Teflon piston). Sodium fluoride can be used to medically manage active otospongiosis.

Practice by Chapter

Tympanic Membrane Perforation

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Cholesteatoma

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Tympanoplasty Techniques

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Ossicular Chain Reconstruction

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Mastoidectomy

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Stapedectomy

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Implantable Hearing Devices

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Congenital Aural Atresia

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Otologic Trauma

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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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