Tumors of the Ear and Temporal Bone — MCQs

10 questions

Which cancers can cause referred otalgia (referred pain in the ear)? Select the most comprehensive answer.

A 68-year-old man has many months history of progressive hearing loss, unsteady gait, tinnitus, and facial pain. An MRI scan reveals a tumor at the cerebellopontine angle. Which of the following cranial nerves is this tumor most likely to affect?

A 35-year-old patient presents with hearing loss and discomfort in the right ear. Examination reveals keratin accumulation in the ear canal. What is the most likely diagnosis?

All of the following are true about glomus-jugulare tumor except:

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

The diagnosis in a patient with 6th nerve palsy, retro-orbital pain and persistent ear discharge is -

35 years old female presents with tinnitus, vertigo and aural fullness. Likely diagnosis:

Mainstay of treatment of glue ear -

The usual location of glomus jugulare tumor is -

Q10

In which condition is light reflex distortion typically observed?

Tumors of the Ear and Temporal Bone Indian Medical PG Practice Questions and MCQs

Question 1: Which cancers can cause referred otalgia (referred pain in the ear)? Select the most comprehensive answer.

A. Cancer of the pharynx
B. Cancer of the oral cavity
C. Cancer of the pharynx, oral cavity, and larynx (Correct Answer)
D. Cancer of the larynx

Explanation: ***Cancer of the pharynx, oral cavity, and larynx*** - Cancers in these locations can cause **referred otalgia** due to shared innervation of the ear by cranial nerves that also supply these areas. - Specifically, the **glossopharyngeal nerve (IX)**, **vagus nerve (X)**, and **trigeminal nerve (V3)** are involved in both sensation from these head and neck regions and the ear. *Cancer of the pharynx* - While pharyngeal cancer can cause **referred otalgia** through cranial nerves IX and X, it is not the most comprehensive answer as other sites are also involved. - This option exclusively mentions the pharynx, missing other important anatomical locations that can also refer pain to the ear. *Cancer of the oral cavity* - Cancer here can cause **referred otalgia**, primarily through the **trigeminal nerve (V3)**, which innervates parts of the oral cavity and the ear. - However, similar to pharyngeal cancer, this option is not comprehensive as it omits other regions related to referred ear pain. *Cancer of the larynx* - Laryngeal cancer can cause **referred otalgia** via the **vagus nerve (X)**, specifically its superior laryngeal branch. - This option is also incomplete as it does not include cancers of the pharynx or oral cavity, which are equally important causes of referred ear pain.

Question 2: A 68-year-old man has many months history of progressive hearing loss, unsteady gait, tinnitus, and facial pain. An MRI scan reveals a tumor at the cerebellopontine angle. Which of the following cranial nerves is this tumor most likely to affect?

A. sixth cranial nerve
B. eighth cranial nerve (Correct Answer)
C. tenth cranial nerve
D. fourth cranial nerve

Explanation: ***eighth cranial nerve*** - The **eighth cranial nerve (vestibulocochlear nerve)** is located in the **cerebellopontine angle** and is responsible for **hearing and balance**. [1], [2] - Symptoms like **progressive hearing loss, tinnitus, and unsteady gait (vertigo)** are classic signs of compression or damage to this nerve, often caused by an **acoustic neuroma (vestibular schwannoma)** in this region. [2], [3] - **CN VIII is the FIRST and MOST COMMONLY affected nerve** in cerebellopontine angle tumors, making it the correct answer. - The **facial pain** mentioned suggests compression of the **trigeminal nerve (CN V)** by a large tumor, which can occur as the tumor expands, but CN VIII remains the primary nerve affected. *sixth cranial nerve* - The **sixth cranial nerve (abducens nerve)** innervates the **lateral rectus muscle**, responsible for **abduction of the eye**. - Damage would typically result in **diplopia** and an inability to move the eye laterally, which is not described. - This nerve is **rarely affected** by CPA tumors due to its anatomical location. *tenth cranial nerve* - The **tenth cranial nerve (vagus nerve)** controls **pharyngeal and laryngeal muscles**, as well as **parasympathetic innervation to many organs**. - Damage would typically cause **dysphagia**, **hoarseness**, or autonomic dysfunction, none of which are presented. - The vagus nerve is **not typically affected** by CPA tumors. *fourth cranial nerve* - The **fourth cranial nerve (trochlear nerve)** innervates the **superior oblique muscle**, aiding in **eye movement**. - Damage would primarily lead to **vertical diplopia**, particularly when looking down and in, which is not mentioned as a symptom. - This nerve is **not affected** by CPA tumors due to its location.

Question 3: A 35-year-old patient presents with hearing loss and discomfort in the right ear. Examination reveals keratin accumulation in the ear canal. What is the most likely diagnosis?

A. Keratosis obturans (Correct Answer)
B. Exostosis
C. Cerumen
D. Otitis externa

Explanation: ***Keratosis obturans*** - This condition is characterized by an **accumulation of desquamated keratin** and epithelial debris in the bony external auditory canal, leading to earache, conductive hearing loss, and sometimes widening of the ear canal. - The patient's presentation of **hearing loss**, **discomfort in the right ear**, and **keratin accumulation** aligns directly with the description of keratosis obturans. *Exostosis* - Exostoses are **bony growths** in the ear canal, often associated with cold water exposure. - While they can cause hearing loss and earwax impaction, they do not involve primary **keratin accumulation** as described. *Cerumen* - **Cerumen** is normal earwax, which is a mix of secretions and desquamated cells. - While excessive cerumen can cause hearing loss, the description of **keratin accumulation** suggests a more organized, dense plug than typical cerumen impaction. *Otitis externa* - **Otitis externa** is an inflammation or infection of the ear canal, presenting with pain, redness, swelling, and discharge. - While it can cause discomfort and sometimes lead to debris, the primary finding is **inflammation**, not specifically a large accumulation of keratin.

Question 4: All of the following are true about glomus-jugulare tumor except:

A. Are paragangliomas
B. Arises from the adventitia of jugular bulb
C. Pulsatile tinnitus and conductive deafness seen
D. Most commonly affects male (Correct Answer)

Explanation: ***Most commonly affects male*** - **Glomus jugulare tumors** are more common in **females** (3:1 to 5:1 ratio), making this statement **incorrect**. - This tumor type is related to **paragangliomas** and typically affects middle-aged individuals, with a clear predilection for the female sex. *Are paragangliomas* - **Glomus jugulare tumors** are indeed **paragangliomas**, arising from neuroendocrine cells (chemoreceptor cells) of the jugular bulb. - These are **chemodectomas**, originating from neural crest cells associated with the parasympathetic nervous system. *Arises from the adventitia of jugular bulb* - **Glomus jugulare tumors** arise from the **paraganglia in the adventitia of the jugular bulb**. - These are **glomus bodies** (chemoreceptor tissue) located in the temporal bone, specifically in the jugular foramen region. *Pulsatile tinnitus and conductive deafness seen* - **Pulsatile tinnitus** is a classic symptom due to the tumor's highly vascular nature and proximity to the ear. - **Conductive hearing loss** can result from the tumor encroaching on the middle ear ossicles or filling the tympanic cavity.

Question 5: Which of the following statements about Glomus jugulare tumors is correct?

A. Arises from non-chromaffin cells. (Correct Answer)
B. Metastasize to lymph nodes.
C. None of the options.
D. More common in males than in females.

Explanation: ***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.

Question 6: The diagnosis in a patient with 6th nerve palsy, retro-orbital pain and persistent ear discharge is -

A. Gradenigo's syndrome (Correct Answer)
B. Frey's syndrome
C. Rendu-Osler-Weber disease
D. Sjogren's syndrome

Explanation: ***Gradenigo's syndrome*** - This syndrome is characterized by a triad of symptoms: **6th nerve palsy** (diplopia due to lateral rectus muscle paralysis), **retro-orbital pain** (due to trigeminal nerve involvement), and **persistent ear discharge** (indicating otitis media or mastoiditis). - It arises from inflammation or infection (often **petrous apicitis**) spreading from the middle ear to the adjacent petrous apex, affecting cranial nerves VI and V. *Frey's syndrome* - This syndrome is also known as **auriculotemporal syndrome** and is characterized by sweating and flushing in the distribution of the auriculotemporal nerve during eating. - It typically occurs after trauma or surgery to the parotid gland, leading to aberrant reinnervation of sweat glands by parasympathetic fibers. *Rendu-Osler-Weber disease* - This is an autosomal dominant disorder also known as **hereditary hemorrhagic telangiectasia (HHT)**. - It is characterized by widespread **telangiectasias** and **arteriovenous malformations**, often presenting with recurrent epistaxis, gastrointestinal bleeding, and visceral malformations. *Sjogren's syndrome* - This is a chronic autoimmune disease characterized by **dry eyes (keratoconjunctivitis sicca)** and **dry mouth (xerostomia)**, due to lymphocytic infiltration of exocrine glands. - It may also involve systemic manifestations but does not typically present with 6th nerve palsy or ear discharge.

Question 7: 35 years old female presents with tinnitus, vertigo and aural fullness. Likely diagnosis:

A. Ototoxicity
B. Noise Induced Hearing Loss
C. Meniere's Disease (Correct Answer)
D. Otosclerosis

Explanation: ***Meniere's Disease*** - The classic triad of symptoms for Meniere's disease includes **tinnitus**, **vertigo**, and **aural fullness**, along with fluctuating sensorineural hearing loss. - This condition is thought to be caused by an excess of **endolymphatic fluid** within the inner ear. *Ototoxicity* - This condition typically presents with **bilateral, symmetrical hearing loss** and tinnitus, often induced by certain medications (e.g., aminoglycosides, aspirin in high doses). - It usually does not involve episodic vertigo or aural fullness, which are characteristic of Meniere's. *Noise Induced Hearing Loss* - Characterized primarily by **permanent sensorineural hearing loss**, often at specific frequencies (e.g., 4000 Hz notch), and **tinnitus** after prolonged exposure to loud noise. - It does not typically cause the episodic vertigo or sense of aural fullness seen in Meniere's disease. *Otosclerosis* - This condition causes **progressive conductive hearing loss** due to abnormal bone growth around the stapes bone, impairing its movement. - While it can cause tinnitus, it typically does not present with vertigo or aural fullness, and the primary hearing loss is conductive, not sensorineural.

Question 8: Mainstay of treatment of glue ear -

A. Temporal bone resection
B. Tonsillectomy & adenoidectomy
C. Radical Mastoidectomy
D. Myringotomy + aeration to middle ear (Correct Answer)

Explanation: ***Myringotomy + aeration to middle ear*** - **Myringotomy** involves creating a small incision in the eardrum to drain fluid, and inserting a **grommet (ventilation tube)** to aerate the middle ear, which is the primary treatment for persistent glue ear (otitis media with effusion). - This procedure aims to restore ventilation to the middle ear, allowing trapped fluid to drain and preventing recurrent fluid accumulation, which improves hearing. *Temporal bone resection* - This is a major surgical procedure involving the removal of part of the temporal bone, typically reserved for extensive **malignant tumors** or severe infections, and is not indicated for glue ear. - It carries significant risks and is disproportionate to the treatment of a benign condition like glue ear. *Tonsillectomy & adenoidectomy* - While **adenoidectomy** can sometimes be performed in conjunction with grommet insertion if enlarged adenoids contribute to eustachian tube dysfunction, it is not the **primary treatment** for glue ear itself. - **Tonsillectomy** is generally performed for recurrent tonsillitis and has no direct role in treating glue ear. *Radical Mastoidectomy* - This is a highly invasive surgical procedure involving the removal of the mastoid air cells and part of the external auditory canal, typically performed for severe **cholesteatoma** or chronic mastoiditis. - It is an extensive and risky operation that is not appropriate for the management of glue ear, which is a much milder condition.

Question 9: The usual location of glomus jugulare tumor is -

A. Mastoid air cells
B. Epitympanum
C. Internal auditory meatus
D. Hypotympanum (Correct Answer)

Explanation: ***Hypotympanum*** - The **glomus jugulare tumor** originates from **chemoreceptor cells (glomus bodies)** located in the adventitia of the **jugular bulb**, which is situated in the hypotympanum. - This location accounts for the common presentation of these tumors within the **middle ear space**, often eroding upwards from the floor. *Mastoid air cells* - While glomus jugulare tumors can invade the **mastoid**, this is typically a secondary extension, not their primary site of origin. - Tumors primarily arising in the mastoid air cells are more commonly **cholesteatomas** or **primary mastoid malignancies**. *Epitympanum* - The **epitympanum** (attic) is the upper part of the middle ear and is more often associated with the origin of **cholesteatomas** or extensions of tympanic membrane perforations. - **Glomus jugulare tumors** are not typically found to originate here. *Internal auditory meatus* - The **internal auditory meatus** houses the facial nerve and vestibulocochlear nerve and is the common location for **vestibular schwannomas (acoustic neuromas)**. - **Glomus jugulare tumors** do not primarily originate in this location but can extend to involve the internal auditory meatus in advanced stages.

Question 10: In which condition is light reflex distortion typically observed?

A. ASOM (Correct Answer)
B. Glomus
C. OME
D. CSOM

Explanation: ***ASOM*** - In **Acute Suppurative Otitis Media (ASOM)**, there is inflammation and fluid accumulation in the middle ear, causing the **tympanic membrane to bulge and distort**. - This **distortion** of the tympanic membrane directly leads to an **abnormal or absent light reflex** when examined with an otoscope. *Glomus* - A **glomus tumor** is a rare, benign, highly vascular tumor typically found in the middle ear. - While it may cause conductive hearing loss and pulsatile tinnitus, it does not primarily involve changes to the **light reflex** as a direct result of tympanic membrane distortion. *OME* - **Otitis Media with Effusion (OME)**, or "glue ear," involves thick fluid behind the tympanic membrane but without acute inflammation. - The tympanic membrane may appear dull or retracted, and the light reflex can be diffuse or absent, but it's typically not described as "distorted" in the same way as with acute bulging. *CSOM* - **Chronic Suppurative Otitis Media (CSOM)** involves a persistent perforation of the tympanic membrane and chronic discharge. - The key feature is the **perforation**, which would mean the light reflex itself (reflection off an intact drum) would be absent or severely altered, rather than simply distorted.

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