Neurotology Practice Questions

Q: Hitselberger's sign is seen in?

Acoustic neuroma. ***Acoustic neuroma*** - Hitselberger's sign is an area of **hypoesthesia** or **anesthesia** in the **posterosuperior portion of the external auditory canal**. - Acoustic neuromas (vestibular schwannomas) arise from the **vestibular portion of CN VIII** in the internal auditory canal. - This sign results from involvement of the **sensory fibers of the nervus intermedius** (sensory branch associated with the facial nerve) due to close anatomical proximity in the cerebellopontine angle. - This symptom, also known as the **"ear canal sign,"** is relatively specific for acoustic neuroma. *Glomus Tumour* - Glomus tumors are **highly vascular benign tumors** of the **middle ear** that present with **pulsatile tinnitus** and conductive hearing loss. - While they can affect cranial nerves, Hitselberger's sign is not a characteristic presentation. *Nasal angiofibroma* - Nasal angiofibromas are **benign, highly vascular tumors** found in the **nasopharynx**, primarily affecting adolescent males. - They typically present with **epistaxis** and **nasal obstruction** and do not cause Hitselberger's sign. *Acute suppurative otitis media* - Acute suppurative otitis media is an **infection of the middle ear** causing earache, fever, and hearing loss. - It does not involve the cerebellopontine angle or sensory innervation of the external auditory canal in a way that would lead to Hitselberger's sign.

Q: What is the classification of a glomus jugulare tumor that invades the vertical part of the carotid canal?

Type C. ***Type C (Fisch Classification)*** - A **Type C glomus jugulare tumor** is defined by its deep invasion into the **carotid canal**, specifically involving the vertical portion (Type C1). - This classification (Fisch Classification) highlights the significant **intracranial extension** and potential for neurological complications due to the invasion of critical vascular and neural structures. - The Fisch Classification is specifically used for **glomus jugulare tumors** to assess surgical approach and prognosis. *Type A* - **Type A glomus tumors** are typically smaller, localized to the **middle ear cavity** and jugular bulb, without bone erosion of the carotid canal. - These tumors are generally confined without extending into the carotid canal or petrous bone. *Type B* - **Type B glomus tumors** show involvement with erosion into the **mastoid** and extensive involvement of the jugular bulb. - While they are more extensive than Type A, they do not involve the **carotid canal**. *Type D* - **Type D glomus tumors** are characterized by extensive intracranial extension beyond the carotid canal, with involvement of the **cavernous sinus** or central skull base. - These tumors represent the most advanced stage with significant intracranial extension.

Q: Site of glomus jugulare tumor?

Hypotympanum. ***Hypotympanum*** - **Glomus jugulare tumor** is a paraganglioma arising from the **paraganglia** (chemoreceptor cells) located in the **adventitia of the jugular bulb** in the **jugular foramen**. - This anatomical location places the tumor in the **hypotympanum** (inferior compartment of the middle ear cavity), which lies directly above the jugular bulb [1]. - These tumors typically present with **pulsatile tinnitus**, **hearing loss**, and a **reddish-blue mass** behind the tympanic membrane (rising sun sign). - The hypotympanum extends from the floor of the middle ear to the level of the inferior margin of the tympanic membrane [1]. *Epitympanum* - The **epitympanum** (attic) is the **superior compartment** of the middle ear, located above the tympanic membrane [1]. - It contains the head of the **malleus** and body of the **incus** [1]. - **Glomus tympanicum tumors** (arising from paraganglia along the tympanic plexus on the promontory) may present here, but glomus jugulare tumors originate inferiorly in the hypotympanum. *Mesotympanum* - The **mesotympanum** is the **middle compartment** of the middle ear, at the level of the tympanic membrane. - It contains the **manubrium of malleus** and **long process of incus**. - While glomus jugulare tumors may extend into this region as they grow, their primary site of origin is the hypotympanum. *Internal ear* - The **internal ear** (inner ear) is located medial to the middle ear and contains the **cochlea**, **vestibule**, and **semicircular canals** [1]. - Advanced glomus jugulare tumors may erode into the inner ear causing **sensorineural hearing loss** and **vertigo**, but this is not their site of origin.

Q: Which of the following cranial nerves is typically involved in acoustic neuroma?

Facial. ***Facial*** - The **facial nerve (CN VII)** often becomes compressed or irritated by an **acoustic neuroma** due to its close proximity to the vestibulocochlear nerve (CN VIII) within the internal auditory canal. [1] - Symptoms related to facial nerve involvement can include **facial weakness**, **numbness**, or **paralysis** on the affected side. [1] *Vagus* - The **vagus nerve (CN X)** is located in the brainstem and extends to the neck, chest, and abdomen, far from the typical location of an **acoustic neuroma**. - Involvement of the vagus nerve would lead to symptoms such as **dysphagia**, **hoarseness**, or **autonomic dysfunction**, which are not characteristic of acoustic neuroma. *Glossopharyngeal* - The **glossopharyngeal nerve (CN IX)** is responsible for taste in the posterior tongue, swallowing, and sensation from the pharynx, and it exits the skull through the **jugular foramen**, which is not directly affected by an **acoustic neuroma**. - Symptoms of glossopharyngeal involvement include difficulty swallowing or an altered gag reflex, which are uncommon in acoustic neuroma. *Oculomotor* - The **oculomotor nerve (CN III)** controls most **eye movements** and pupillary constriction, originating from the midbrain. - An **acoustic neuroma** is located in the **cerebellopontine angle**, far from the oculomotor nerve's path, so its involvement is not typical.

Q: Which of the following is the MOST characteristic symptom of Gradenigo syndrome?

Diplopia. ***Diplopia*** - **Diplopia** (double vision) due to **abducens nerve (CN VI)** palsy is the **most characteristic** symptom of **Gradenigo syndrome**. - Gradenigo syndrome (apical petrositis) presents with a **classic triad**: otorrhea, retro-orbital pain, and **abducens nerve palsy causing diplopia**. - The abducens nerve is affected as it traverses the **Dorello's canal** adjacent to the inflamed petrous apex. - **Diplopia is the defining neurological sign** that distinguishes Gradenigo syndrome from simple otitis media with mastoiditis. *Retro-orbital pain* - **Retro-orbital pain** is the second component of the classic triad, caused by irritation of the **trigeminal nerve (CN V)**, specifically the ophthalmic division. - While present in Gradenigo syndrome, it is **less specific** than diplopia, as retro-orbital pain can occur in many other conditions (orbital cellulitis, cavernous sinus thrombosis, cluster headache). - Pain is typically **unilateral** and severe. *Persistent ear discharge* - **Persistent ear discharge** (otorrhea) represents the underlying **otitis media** and **mastoiditis** that leads to Gradenigo syndrome. - It is the **first component of the triad** but is not specific to Gradenigo syndrome itself—otorrhea occurs in many cases of chronic otitis media without petrous apex involvement. - Gradenigo syndrome specifically describes the **neurological complications** from infection spreading to the **petrous apex**. *Vertigo* - **Vertigo** is **not part of the classic Gradenigo triad** and is not a characteristic symptom. - While vertigo can occur with inner ear involvement in complicated otitis media, it is inconsistent and non-specific for Gradenigo syndrome. - The hallmark features remain the triad of otorrhea, CN VI palsy (diplopia), and CN V irritation (retro-orbital pain).

Q: Which of the following can cause unilateral sensorineural hearing loss?

Acoustic neuroma. ***Acoustic neuroma*** - An **acoustic neuroma** (vestibular schwannoma) is a benign tumor that grows on the **vestibulocochlear nerve** (cranial nerve VIII), which can compress the nerve and cause progressive unilateral sensorineural hearing loss. - Other associated symptoms often include **tinnitus** and **balance disturbances** (vertigo or unsteadiness). *Coronavirus* - While some reports suggest a rare association between **COVID-19** and sudden sensorineural hearing loss due to viral inflammation or vascular compromise, it is not a common or definitive cause of progressive unilateral hearing loss. - Hearing loss directly due to coronavirus infection is typically acute and bilateral, rather than chronic and unilateral. *Pertussis* - **Pertussis** (whooping cough) is a bacterial respiratory infection that does not typically cause sensorineural hearing loss. - Complications are primarily pulmonary, neurological (e.g., seizures due to hypoxia), or nutritional, not otological. *Rotavirus* - **Rotavirus** causes severe gastroenteritis, particularly in infants and young children. - There is no established link between rotavirus infection and sensorineural hearing loss.

Q: Glomus jugulare commonly arises from which location?

Jugular foramen. ***Jugular foramen*** - Glomus jugulare tumors arise from **glomus bodies located in the adventitia of the jugular bulb** at the **jugular foramen**. - These are **paragangliomas** originating from chemoreceptor cells in the dome of the jugular bulb, which then extend superiorly into the middle ear cavity (hypotympanum) and can erode through the jugular foramen inferiorly. - The jugular foramen is the anatomical landmark that defines the **primary site of origin** for glomus jugulare tumors, distinguishing them from glomus tympanicum tumors. *Hypotympanum* - The hypotympanum (floor of the middle ear) is commonly **involved secondarily** when glomus jugulare tumors extend upward from the jugular bulb into the middle ear space. - While glomus jugulare tumors frequently present in this location, it represents **tumor extension** rather than the primary site of origin. - **Glomus tympanicum** tumors can arise within the middle ear from the tympanic plexus on the promontory. *Mesotympanum* - This is the central part of the middle ear cavity, directly medial to the tympanic membrane. - This area contains the **tympanic plexus (Jacobson's nerve)** from which **glomus tympanicum** tumors arise, not glomus jugulare. *Epitympanum* - The epitympanum (attic) is the superior part of the middle ear cavity, above the level of the tympanic membrane. - This is not a typical site for paraganglioma origin in the temporal bone.

Q: Most definitive treatment for large symptomatic acoustic neuroma is

Surgery. ***Surgery*** - **Surgical resection** is the most definitive treatment for **large, symptomatic acoustic neuromas** (typically >3 cm), especially those causing **mass effect** on the brainstem and cerebellum. - It aims for **complete tumor removal** to alleviate symptoms (hearing loss, facial nerve dysfunction, brainstem compression) and prevent further neurological compromise. - Surgical approaches include **translabyrinthine**, **retrosigmoid**, or **middle cranial fossa** approaches depending on tumor size and hearing status. *Steroids* - **Steroids** may be used to manage acute symptoms like **edema** or inflammation associated with the tumor, but they are not a definitive treatment. - They do not address the underlying tumor growth or remove the mass. - Used only as **temporary symptomatic relief** or perioperative adjunct. *Radiotherapy* - **Stereotactic radiosurgery** (Gamma Knife, CyberKnife) is effective for **small to medium-sized tumors** (<3 cm) with good tumor control rates. - For **large tumors**, radiotherapy is **insufficient** as it only aims to **control tumor growth** rather than remove the mass, and cannot provide immediate decompression. - Large tumors with mass effect require **surgical decompression** for definitive management. *Anti-neoplastic drugs* - **Anti-neoplastic drugs** (chemotherapy) are generally **ineffective** against acoustic neuromas, which are **benign vestibular schwannomas**. - They are typically reserved for malignant tumors or specific genetic syndromes (e.g., bevacizumab in NF2-related schwannomas), but not for standard sporadic acoustic neuromas. - Chemotherapy is **not a definitive treatment** for these benign tumors.

Q: Which of the following statements about Glomus jugulare tumors is correct?

Arises from non-chromaffin cells.. ***Arises from non-chromaffin cells.*** - Glomus jugulare tumors are paragangliomas, which originate from **neuroectodermal cells** of the paraganglia system. - These cells are **non-chromaffin**, meaning they do not stain with chromium salts, unlike chromaffin cells found in the adrenal medulla. - This is a key distinguishing feature of glomus tumors. *Incorrect: More common in males than in females.* - This is **incorrect** - glomus jugulare tumors show a **strong female predominance** with a female-to-male ratio of approximately **4-6:1**. - This female predilection is a well-established epidemiological characteristic of these tumors. *Incorrect: Metastasize to lymph nodes.* - Glomus jugulare tumors are generally considered **benign** but locally aggressive, with a very **low metastatic potential** (~5%). - When metastasis does occur (rare), it typically involves distant sites like bone, lung, or liver, rather than regional lymph nodes. - Lymph node metastasis is not a characteristic feature. *Incorrect: None of the options.* - This option is incorrect because the statement "Arises from non-chromaffin cells" is a factually correct characteristic of glomus jugulare tumors. - Glomus tumors are derived from glomus cells, which are part of the non-chromaffin paraganglia system.

Q: Phelps sign is seen in:

Glomus jugulare. ***Glomus jugulare*** - **Phelps sign** (also known as the **“J” sign** or **jugular foramen sign**) on imaging is characteristic of **glomus jugulare tumors**, indicating erosion of the jugular foramen. - This sign refers to the destruction of the **jugular spine**, which is the bony ridge separating the jugular foramen from the carotid canal. *Vestibular Schwannoma* - **Vestibular schwannomas** typically arise from the **vestibulocochlear nerve** within the internal auditory canal and cerebellopontine angle, not the jugular foramen. - While they can cause hearing loss and balance issues, their characteristic imaging findings are **enhancement within the internal auditory canal** and expansion of the canal itself. *Meniere's disease* - **Meniere's disease** is an inner ear disorder characterized by episodes of vertigo, fluctuating hearing loss, tinnitus, and aural fullness. - It is diagnosed clinically and does not present with specific imaging signs like Phelps sign, as it is related to **endolymphatic hydrops**. *Neurofibromatosis* - **Neurofibromatosis** is a genetic disorder associated with the growth of tumors on nerves throughout the body. While it can involve the head and neck (e.g., bilateral vestibular schwannomas in NF2), Phelps sign is not a characteristic imaging finding. - Imaging in neurofibromatosis would show **multiple neurofibromas** or specific nerve sheath tumors depending on the type (NF1 or NF2).

Question 1

Hitselberger's sign is seen in?

Accepted Answer

Acoustic neuroma

Answer

Glomus Tumour

Answer

Nasal angiofibroma

Answer

Acute suppurative otitis media

Question 2

What is the classification of a glomus jugulare tumor that invades the vertical part of the carotid canal?

Accepted Answer

Type C

Answer

Type A

Answer

Type B

Answer

Type D

Question 3

Site of glomus jugulare tumor?

Accepted Answer

Hypotympanum

Answer

Epitympanum

Answer

Mesotympanum

Answer

Internal ear

Question 4

Which of the following cranial nerves is typically involved in acoustic neuroma?

Accepted Answer

Facial

Answer

Oculomotor

Answer

Glossopharyngeal

Answer

Vagus

Question 5

Which of the following is the MOST characteristic symptom of Gradenigo syndrome?

Accepted Answer

Diplopia

Answer

Retro-orbital pain

Answer

Persistent ear discharge

Answer

Vertigo

Question 6

Which of the following can cause unilateral sensorineural hearing loss?

Accepted Answer

Acoustic neuroma

Answer

Coronavirus

Answer

Pertussis

Answer

Rotavirus

Question 7

Glomus jugulare commonly arises from which location?

Accepted Answer

Jugular foramen

Answer

Mesotympanum

Answer

Epitympanum

Answer

Hypotympanum

Question 8

Most definitive treatment for large symptomatic acoustic neuroma is

Accepted Answer

Surgery

Answer

Steroids

Answer

Radiotherapy

Answer

Anti-neoplastic drugs

Question 9

Which of the following statements about Glomus jugulare tumors is correct?

Accepted Answer

Arises from non-chromaffin cells.

Answer

Metastasize to lymph nodes.

Answer

None of the options.

Answer

More common in males than in females.

Question 10

Phelps sign is seen in:

Accepted Answer

Glomus jugulare

Answer

Neurofibromatosis

Answer

Meniere's disease

Answer

Vestibular Schwannoma

Neurotology — MCQs

Neurotology — MCQs

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