Otology Practice Questions

Q: A 60-year-old lady presented with mild hearing loss and pulsatile tinnitus of the right ear. Otoscopy revealed specific findings. What is the most probable diagnosis?

Glomus tumor. ***Glomus tumor*** - **Pulsatile tinnitus** is a cardinal feature of glomus tumors, particularly glomus tympanicum, which presents with the classic **"rising sun" sign** on otoscopy. - **Brown's sign** (blanching of the reddish mass behind the tympanic membrane with positive pressure) is pathognomonic for glomus tympanicum. *Acoustic neuroma* - Typically presents with **unilateral sensorineural hearing loss** and **non-pulsatile tinnitus**, not pulsatile tinnitus. - Otoscopic examination is usually **normal** as the tumor arises from the cerebellopontine angle, not the middle ear. *Squamous cell carcinoma* - Presents with **otalgia**, **otorrhea**, and **granulation tissue** rather than pulsatile tinnitus. - Associated with **chronic otitis externa** and shows **ulcerative lesions** on otoscopy, not vascular masses. *Aural polyp* - Typically arises from **chronic otitis media** or **chronic otitis externa** with associated **purulent discharge**. - Appears as **pale, non-pulsatile masses** on otoscopy and does not cause pulsatile tinnitus.

Q: Gradenigo's syndrome is characterized by all except?

Positive Griesinger sign. **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).

Q: 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?

Dislocation of the incudostapedial joint. ### 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).

Q: Gradenigo's syndrome is due to:

Petrositis. **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).

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

Otosclerosis. **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.

Q: Edema over the mastoid is seen in which condition?

Lateral sinus thrombophlebitis. **Explanation:** The correct answer is **Lateral Sinus Thrombophlebitis (LSTP)**. The specific clinical sign described is known as **Griesinger’s Sign**. **1. Why Lateral Sinus Thrombophlebitis is correct:** LSTP is a complication of chronic or acute otitis media where infection spreads to the sigmoid (lateral) sinus. This leads to the formation of an infected thrombus. Griesinger’s sign occurs due to **thrombosis of the mastoid emissary vein**, which normally drains into the sigmoid sinus. When this vein is obstructed, it leads to edema and tenderness over the posterior part of the mastoid process. **2. Why the other options are incorrect:** * **Bell’s Palsy:** This is an idiopathic lower motor neuron facial nerve paralysis. It involves the facial nerve (CN VII) but does not cause mastoid edema or inflammatory changes. * **Chronic Suppurative Otitis Media (CSOM):** While CSOM is the most common *precursor* to LSTP, uncomplicated CSOM presents with ear discharge and hearing loss, not mastoid edema. * **Acute Suppurative Otitis Media (ASOM):** ASOM involves inflammation of the middle ear cleft. While it can lead to **Mastoiditis** (which causes edema over the mastoid due to subperiosteal abscess), the classic association for edema specifically linked to venous congestion in this region is LSTP. **Clinical Pearls for NEET-PG:** * **Griesinger’s Sign:** Edema over the mastoid due to mastoid emissary vein thrombosis (Pathognomonic for LSTP). * **Picket-fence fever:** The characteristic hectic temperature chart seen in LSTP. * **Tobey-Ayer Test / Queckenstedt’s Test:** Used during lumbar puncture to detect lateral sinus obstruction (pressure does not rise when the jugular vein on the affected side is compressed). * **Delta Sign:** Seen on contrast-enhanced CT, representing a thrombus in the sigmoid sinus.

Q: In otosclerosis, tinnitus is most commonly due to which of the following?

Cochlear involvement. ### Explanation **Correct Answer: A. Cochlear involvement** In otosclerosis, tinnitus is a common symptom, often described as a low-pitched, roaring, or hissing sound. While the primary pathology of otosclerosis is the fixation of the stapes footplate (leading to conductive hearing loss), the development of **tinnitus is most strongly associated with cochlear involvement (Sensory Neural component)**. The underlying mechanism involves the release of toxic enzymes (like lysosomal hydrolases) from the active otosclerotic focus into the perilymph. These enzymes cause biochemical changes and damage to the hair cells or the stria vascularis, leading to secondary cochlear degeneration. This sensorineural irritation is the primary driver of persistent tinnitus in these patients. **Why other options are incorrect:** * **B. Increased vascularity:** While an active focus (Schwartze sign) shows increased vascularity, this typically causes *pulsatile* tinnitus, which is much less common than the continuous tinnitus caused by cochlear irritation. * **C. Conductive hearing loss:** CHL makes a patient more aware of internal body sounds (autophony) because the "masking effect" of ambient environmental noise is lost. However, it is not the primary physiological cause of the tinnitus itself in otosclerosis. --- ### High-Yield Clinical Pearls for NEET-PG: * **Schwartze Sign (Flamingo Flush):** Indicates active otosclerosis (Otospongiosis) with increased vascularity over the promontory. * **Carhart’s Notch:** A characteristic dip in the bone conduction threshold at **2000 Hz**. * **Gelle’s Test:** Negative in otosclerosis (indicates a fixed ossicular chain). * **Treatment of Choice:** Stapedotomy (using a Teflon piston). * **Medical Management:** Sodium Fluoride (used to mature an active focus and prevent cochlear progression).

Q: What is the most common site for the initiation of otosclerosis?

Fissula antefenestrum. **Explanation:** Otosclerosis is a primary metabolic bone disease of the otic capsule characterized by the replacement of normal dense bone with irregular, vascularized spongy bone. **Why Fissula Antefenestrum is correct:** The **fissula antefenestrum** is a small area of vestigial embryonic cartilage located just **anterior to the oval window**. It is the most common site of origin for otosclerosis (seen in approximately 80-90% of cases). When the disease starts here, it often spreads to the annular ligament and the stapes footplate, leading to "stapedial fixation" and subsequent conductive hearing loss. **Analysis of Incorrect Options:** * **Footplate of stapes:** While the footplate is frequently involved as the disease progresses, it is usually not the primary site of initiation. The disease typically spreads *to* the footplate from the fissula antefenestrum. * **Margins of stapes:** Similar to the footplate, the margins (annular ligament) are involved during the clinical phase of the disease, leading to ankylosis, but they are secondary sites. * **Fissula post fenestram:** This is located posterior to the oval window. While otosclerotic foci can occur here, it is significantly less common than the anterior site. **High-Yield Clinical Pearls for NEET-PG:** * **Schwartze Sign:** A flamingo-pink blush seen through the TM due to increased vascularity of the promontory (active phase). * **Carhart’s Notch:** A characteristic dip in the bone conduction threshold at **2000 Hz**. * **Gelle’s Test:** Negative (indicates fixed ossicular chain). * **Treatment of Choice:** Stapedotomy (using a Teflon piston). * **Bezold’s Triad:** Includes (1) Raised bone conduction threshold, (2) Negative Rinne test, and (3) Prolonged Schwabach test.

Question 1

A 60-year-old lady presented with mild hearing loss and pulsatile tinnitus of the right ear. Otoscopy revealed specific findings. What is the most probable diagnosis?

Accepted Answer

Glomus tumor

Answer

Acoustic neuroma

Answer

Squamous cell carcinoma

Answer

Aural polyp

Question 2

In the pathogenesis of otosclerosis, where does the disease process begin?

Accepted Answer

Bone of the otic capsule which develops from cartilage

Answer

Periosteal layer of the otic capsule

Answer

Endosteal layer of the otic capsule

Answer

Mucoperiosteum of the promontory

Question 3

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

Accepted Answer

Immediate mastoid exploration

Answer

Antibiotics and labyrinthine sedative

Answer

Myringoplasty

Answer

Labyrinthectomy

Question 4

Gradenigo's syndrome is characterized by all except?

Accepted Answer

Positive Griesinger sign

Answer

Retro-orbital pain

Answer

Abducent nerve involvement

Answer

Conductive deafness

Question 5

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?

Accepted Answer

Dislocation of the incudostapedial joint

Answer

Collection of fluid in the middle ear

Answer

Otosclerosis

Answer

Acute suppurative otitis media

Question 6

Gradenigo's syndrome is due to:

Accepted Answer

Petrositis

Answer

Mastoiditis

Answer

Sigmoid sinus thrombophlebitis

Answer

Labyrinthitis

Question 7

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

Accepted Answer

Otosclerosis

Answer

Chronic suppurative otitis media

Answer

Meniere's disease

Answer

Acoustic neuroma

Question 8

Edema over the mastoid is seen in which condition?

Accepted Answer

Lateral sinus thrombophlebitis

Answer

Bell's Palsy

Answer

Chronic suppurative otitis media

Answer

Acute suppurative otitis media

Question 9

In otosclerosis, tinnitus is most commonly due to which of the following?

Accepted Answer

Cochlear involvement

Answer

Increased vascularity in the lesion

Answer

Conductive hearing loss

Answer

All of the above

Question 10

What is the most common site for the initiation of otosclerosis?

Accepted Answer

Fissula antefenestrum

Answer

Footplate of stapes

Answer

Margins of stapes

Answer

Fissula post fenestram

Otology — MCQs

Otology — MCQs

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