Neurotology Practice Questions

Q: A false positive fistula test is associated with which of the following conditions?

Congenital syphilis. **Explanation:** The **Fistula Test** is used to identify an abnormal communication (fistula) between the inner and middle ear. A positive result occurs when pressure changes in the external auditory canal (via a Siegle’s speculum) induce nystagmus and vertigo. **1. Why Congenital Syphilis is correct:** In **Congenital Syphilis**, a "False Positive" fistula test occurs, also known as **Hennebert’s Sign**. It is considered "false" because there is no actual bony fistula present. Instead, the nystagmus is caused by: * **Fibrous adhesions** between the stapes footplate and the membranous labyrinth. * An abnormally **hypermobile stapes** footplate. Pressure is transmitted directly to the saccule, triggering the vestibular response despite an intact bony labyrinth. **2. Analysis of Incorrect Options:** * **Perilymph Fistula:** This is a **True Positive**. There is an actual breach in the oval or round window membrane, allowing pressure to affect the perilymph. * **Cholesteatoma:** This is the most common cause of a **True Positive** fistula test, typically due to erosion of the **Horizontal Semicircular Canal**. * **Malignant Sclerosis:** This is not a standard clinical term related to fistula testing. (Otosclerosis, however, usually results in a negative test unless complicated by other factors). **3. NEET-PG High-Yield Pearls:** * **Hennebert’s Sign:** Specifically refers to the false-positive fistula test in Congenital Syphilis or Meniere’s disease (due to fibrosis). * **Tullio Phenomenon:** Vertigo/nystagmus induced by **loud sounds**. Seen in Congenital Syphilis, Meniere’s, and Superior Semicircular Canal Dehiscence (SSCD). * **False Negative Test:** Occurs if the fistula is plugged by cholesteatoma/granulations or if the labyrinth is "dead" (non-functional).

Q: A 10-year-old boy presented with sensorineural deafness not benefited with a hearing aid. What is the next treatment?

Cochlear implant. **Explanation:** The patient is a 10-year-old child with **Sensorineural Hearing Loss (SNHL)** who has failed to benefit from conventional hearing aids. In cases of severe-to-profound SNHL where the auditory nerve is intact but the hair cells in the cochlea are non-functional, a **Cochlear Implant** is the gold standard treatment. It bypasses the damaged hair cells and directly stimulates the auditory nerve fibers electrically. **Analysis of Options:** * **A. Cochlear Implant (Correct):** Indicated for bilateral severe-to-profound SNHL when hearing aids provide inadequate benefit. In children, early implantation is crucial for speech and language development. * **B. Fenestromy:** This is an obsolete surgical procedure formerly used for otosclerosis (conductive hearing loss) to create a new window in the labyrinth. It has no role in treating SNHL. * **C. Stapedectomy:** This is the treatment of choice for **Otosclerosis**, which presents as **Conductive Hearing Loss (CHL)** due to stapes fixation. It involves replacing the stapes with a prosthesis and is contraindicated in SNHL. * **D. Stapes Fixation:** This is a pathological condition (clinical finding in otosclerosis), not a treatment modality. **High-Yield Clinical Pearls for NEET-PG:** * **Ideal Age for Implantation:** The earlier, the better (usually >12 months) to utilize the brain's neuroplasticity for language acquisition. * **Prerequisite:** A patent cochlea and a functional **Cochlear Nerve (CN VIII)** must be present (confirmed via MRI). * **Auditory Brainstem Implant (ABI):** Indicated if the cochlear nerve is absent or destroyed (e.g., Bilateral Acoustic Neuroma/NF2). * **Hennebert’s Sign:** False positive fistula test seen in Meniere’s or Congenital Syphilis; do not confuse with surgical indications.

Q: A glomus tumor is invading the visceral part of the carotid canal. It is classified as which type?

Type C2. This question tests your knowledge of the **Fisch Classification** for Glomus tumors (Paragangliomas), which is the gold standard for determining surgical approach based on anatomical extension. ### **Explanation of the Correct Answer** The Fisch classification categorizes tumors based on their involvement of the temporal bone and skull base. **Type C** tumors specifically involve the **infralabyrinthine compartment** and extend along the **carotid canal**. * **Type C1:** Destroys the bone of the carotid foramen but does not involve the carotid artery itself. * **Type C2:** Invades the **vertical (visceral) portion** of the carotid canal. * **Type C3:** Extends along the **horizontal portion** of the carotid canal. Since the question specifies invasion of the visceral (vertical) part of the carotid canal, **Type C2** is the correct classification. ### **Analysis of Incorrect Options** * **Type B:** These tumors are limited to the tympanomastoid area without involvement of the infralabyrinthine compartment or the carotid canal. * **Type C1:** This involves only the entrance (foramen) of the carotid canal, not the canal's vertical segment. * **Type D:** These tumors have **intracranial extension**. D1 involves extension 2cm. ### **Clinical Pearls for NEET-PG** * **Glomus Jugulare:** Arises from the dome of the jugular bulb (Fisch Type C/D). * **Glomus Tympanicum:** Arises from the promontory (Fisch Type A). * **Phelp’s Sign:** Loss of the bony plate between the carotid canal and the jugular foramen on CT (indicative of Glomus Jugulare). * **Brown’s Sign:** Pulsatile blanching of the tympanic membrane on positive pressure with a Siegel’s speculum (Pathognomonic). * **Aquino’s Sign:** Blanching of the mass on carotid artery compression.

Q: Common presenting manifestations of Meniere's disease are all except?

Loss of consciousness. **Explanation:** Meniere’s disease (Endolymphatic Hydrops) is a disorder of the inner ear characterized by an increase in the volume of endolymph. The classic presentation involves a specific **diagnostic triad** of symptoms. **Why "Loss of Consciousness" is the correct answer:** Meniere’s disease affects the peripheral vestibular system and the cochlea. While the vertigo can be severe enough to cause a "drop attack" (Tumarkin’s otolithic crisis) where the patient falls suddenly without warning, **consciousness is always preserved.** Loss of consciousness (syncope) suggests a central nervous system pathology or a cardiovascular issue, rather than a peripheral inner ear disorder. **Analysis of other options:** * **Vertigo (Option B):** Episodic, true objective vertigo is a hallmark. Attacks typically last 20 minutes to several hours and are often accompanied by nausea and vomiting. * **Sensorineural Deafness (Option C):** Characteristically **fluctuating** and **low-frequency** SNHL. In early stages, hearing returns to normal between attacks, but eventually becomes permanent. * **Tinnitus (Option A):** Usually low-pitched and described as "roaring" or "seashell" sound. It often worsens during acute attacks. **High-Yield Clinical Pearls for NEET-PG:** * **Pathology:** Distension of the endolymphatic system (Endolymphatic Hydrops), most commonly affecting the **scala media** and saccule. * **Audiometry:** Shows low-frequency SNHL; **Recruitment phenomenon** is positive (indicates cochlear pathology). * **Glycerol Test:** Used for diagnosis; oral glycerol (osmotic diuretic) temporarily improves hearing by reducing endolymphatic pressure. * **Management:** Low salt diet, diuretics (Acetazolamide), and Betahistine for maintenance; Intratympanic Gentamicin or Labyrinthectomy for refractory cases.

Q: A 28-year-old female presents with a history of bilateral hearing loss and tinnitus. She reports hearing better in noisy environments. Examination reveals intact ear drums bilaterally, and the Rinne test is negative bilaterally. Pure tone audiometry findings are provided below. What is the most probable diagnosis?

Stapedial otosclerosis. ***Stapedial otosclerosis*** - **Paracusis Willisii** (hearing better in noisy environments) is pathognomonic for otosclerosis, caused by **stapes fixation** preventing normal sound transmission. - **Negative Rinne test** bilaterally indicates **conductive hearing loss** with intact tympanic membranes, showing **middle ear pathology** without external canal involvement. *Meniere's Disease* - Typically presents with **sensorineural hearing loss**, **episodic vertigo**, and **aural fullness**, not the conductive pattern seen here. - **Rinne test would be positive** in Meniere's disease due to **inner ear involvement**, not middle ear pathology. *Endolymphatic fistula* - Usually follows **barotrauma** or **head injury** and presents with **sensorineural hearing loss** and **vestibular symptoms**. - Would show **positive Rinne test** as it affects the **inner ear**, not causing conductive hearing loss. *Vestibular schwannoma* - Presents with **unilateral sensorineural hearing loss**, **tinnitus**, and possible **facial nerve involvement** in advanced cases. - **Rinne test would be positive** and hearing loss is typically **unilateral**, not bilateral as described in this case.

Question 1

A false positive fistula test is associated with which of the following conditions?

Accepted Answer

Congenital syphilis

Answer

Perilymph fistula

Answer

Malignant sclerosis

Answer

Cholesteatoma

Question 2

A 10-year-old boy presented with sensorineural deafness not benefited with a hearing aid. What is the next treatment?

Accepted Answer

Cochlear implant

Answer

Fenestromy

Answer

Stapedectomy

Answer

Stapes fixation

Question 3

A glomus tumor is invading the visceral part of the carotid canal. It is classified as which type?

Accepted Answer

Type C2

Answer

Type B

Answer

Type C1

Answer

Type C3

Question 4

Common presenting manifestations of Meniere's disease are all except?

Accepted Answer

Loss of consciousness

Answer

Tinnitus

Answer

Vertigo

Answer

Sensorineural deafness

Question 5

A 28-year-old female presents with a history of bilateral hearing loss and tinnitus. She reports hearing better in noisy environments. Examination reveals intact ear drums bilaterally, and the Rinne test is negative bilaterally. Pure tone audiometry findings are provided below. What is the most probable diagnosis?

Accepted Answer

Stapedial otosclerosis

Answer

Meniere's Disease

Answer

Endolymphatic fistula

Answer

Vestibular schwannoma

Neurotology — MCQs

Neurotology — MCQs

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