Diseases of the Ear — MCQs

Diseases of the Ear Indian Medical PG Practice Questions and MCQs

Question 321: Prior history of ear surgery and scanty, foul-smelling, painless discharge from the ear are characteristic features of which of the following lesions?

A. ASOM
B. Cholesteatoma (Correct Answer)
C. Central perforation
D. Otitis externa

Explanation: ***Cholesteatoma*** - The **combination of all three features** (prior ear surgery + scanty, foul-smelling, painless discharge) is highly characteristic of cholesteatoma. - A prior history of ear surgery, particularly for **chronic otitis media**, can predispose to or be related to an **acquired cholesteatoma**. - **Scanty, foul-smelling, painless discharge** (otorrhea) is a hallmark symptom of cholesteatoma, with the **foul smell** being particularly distinctive due to breakdown of keratin debris and secondary infection. - The **painless** nature helps differentiate it from acute infections. *ASOM (Acute Suppurative Otitis Media)* - ASOM typically presents with **acute otalgia** (ear pain) and a **profuse purulent, non-foul-smelling discharge** following tympanic membrane perforation. - It is an acute infection and usually does not have a prior history of ear surgery as a direct cause of the current discharge. - The presence of **pain** and absence of foul smell distinguish it from cholesteatoma. *Central perforation* - A central perforation of the tympanic membrane often results in **intermittent, mucoid discharge** during upper respiratory tract infections, which is usually not foul-smelling. - While it can be associated with discharge, the characteristic **foul smell** and **prior surgery history** point away from simple central perforation as the primary diagnosis. - The discharge is typically more profuse during active infection. *Otitis externa* - **Otitis externa** primarily affects the ear canal, causing **pain, tenderness, and sometimes a watery or purulent discharge**, but it does not typically present with a foul-smelling discharge associated with a prior ear surgery history. - It is usually due to infection of the external auditory canal skin and not related to middle ear pathology or prior surgery in the way a cholesteatoma is. - The **painful** nature is a key distinguishing feature.

Question 322: Which of the following statements is NOT true regarding acute suppurative otitis media (ASOM)?

A. Radical mastoidectomy is often necessary for treatment. (Correct Answer)
B. Streptococcus pneumoniae is a common organism causing ASOM.
C. It commonly follows upper respiratory infections.
D. Acute suppurative otitis media (ASOM) commonly resolves without complications.

Explanation: ***Radical mastoidectomy is often necessary for treatment.*** - Radical mastoidectomy is a major surgical procedure reserved for **chronic otitis media with cholesteatoma** or severe complications, not typically for acute suppurative otitis media (ASOM) - ASOM is primarily managed with **antibiotics** and sometimes myringotomy; surgery is only considered in cases of treatment failure or developing complications. *It commonly follows upper respiratory infections.* - **Upper respiratory infections (URIs)** cause inflammation and congestion of the Eustachian tube, leading to its dysfunction and predisposing to ASOM. - The **negative pressure** created in the middle ear due to Eustachian tube dysfunction facilitates bacterial reflux from the nasopharynx. *Streptococcus pneumoniae is a common organism causing ASOM.* - **_Streptococcus pneumoniae_** is one of the most frequently isolated bacterial pathogens in children and adults with ASOM. - Other common pathogens include **_Haemophilus influenzae_** and **_Moraxella catarrhalis_**. *Acute suppurative otitis media (ASOM) commonly resolves without complications.* - While ASOM can be painful, many episodes resolve **spontaneously** or with appropriate antibiotic treatment **without developing serious complications**. - Complications, though rare, can include **mastoiditis**, **meningitis**, or **brain abscess**, but these are not the typical course of untreated ASOM.

Question 323: What is the recommended treatment for deafness associated with attic-antral perforation?

A. Simple mastoid surgery
B. Modified radical mastoid surgery (Correct Answer)
C. Observation and monitoring
D. Use of antibiotic ear drops

Explanation: ***Modified radical mastoid surgery*** - This procedure aims to remove **cholesteatoma** and create a **safe, dry ear**, preserving some hearing function. - It involves removing the posterior and superior canal walls and reconstructing the ossicular chain if possible, which is suitable for managing chronic infections with bone erosion and maintaining function. *Simple mastoid surgery* - This surgery is typically performed for acute **mastoiditis** without extensive bone destruction or cholesteatoma. - It does not address the underlying pathology of an attic-antral perforation with associated deafness effectively. *Observation and monitoring* - Deafness associated with an **attic-antral perforation** usually indicates a progressive disease, often involving cholesteatoma. - **Observation** alone can lead to further bone destruction, intracranial complications, and worsening hearing loss. *Use of antibiotic ear drops* - **Antibiotic ear drops** primarily treat superficial ear infections and may provide temporary relief for discharge. - They do not address the **structural damage**, **cholesteatoma**, or the **conductive hearing loss** caused by an attic-antral perforation.

Question 324: Which cranial nerve is most commonly involved in chronic suppurative otitis media?

A. Cranial Nerve V
B. Cranial Nerve XI
C. Cranial Nerve VII (Correct Answer)
D. Cranial Nerve IX

Explanation: ***Cranial Nerve VII (Facial Nerve)*** - The **facial nerve (CN VII)** is the **most commonly involved cranial nerve** in chronic suppurative otitis media (CSOM). - CN VII runs through the **Fallopian canal** in the temporal bone, in close proximity to the middle ear and mastoid, making it vulnerable to infection and inflammation. - Involvement presents as **facial palsy (House-Brackmann grading)**, which occurs in approximately **0.5-2% of CSOM cases**. - This is a serious complication requiring urgent medical and sometimes surgical intervention. *Cranial Nerve IX (Glossopharyngeal)* - The **glossopharyngeal nerve (CN IX)** is located in the posterior cranial fossa and is **rarely involved** in CSOM. - While referred otalgia can occur through Jacobson's nerve (tympanic branch of CN IX), direct pathological involvement causing glossopharyngeal dysfunction is extremely uncommon in CSOM. *Cranial Nerve XI (Spinal Accessory)* - The **spinal accessory nerve (CN XI)** controls the sternocleidomastoid and trapezius muscles. - This nerve is **not involved** in CSOM complications due to its anatomical location away from the middle ear and temporal bone. *Cranial Nerve V (Trigeminal)* - The **trigeminal nerve (CN V)** provides sensory innervation to the face and motor innervation for mastication. - While the auriculotemporal branch (V3) provides some sensory supply to the external auditory canal, direct CN V involvement in CSOM is **not a recognized complication**.

Question 325: The preferred site of incision for myringotomy in ASOM (Acute Suppurative Otitis Media) to drain the middle ear is:

A. Anteroinferior
B. Posteroinferior (Correct Answer)
C. Anterosuperior
D. Posterosuperior

Explanation: ***Posteroinferior*** - The **posteroinferior quadrant** of the tympanic membrane is the preferred site for myringotomy in **acute suppurative otitis media (ASOM)** due to its relative avascularity and safety regarding middle ear structures. - This location allows for adequate drainage of pus and prevents re-accumulation, without damaging essential structures like the **ossicular chain** or the **facial nerve**. *Anteroinferior* - This quadrant is generally avoided because it provides less effective drainage and carries a higher risk of injury to the **Eustachian tube orifice** or other anterior structures. - The **handle of the malleus** runs posteriorly, and an incision here might be less effective for gravity-assisted drainage. *Anterosuperior* - The **anterosuperior quadrant** is not typically chosen due to its proximity to the **ossicular chain** attachments and potentially larger blood vessels, increasing the risk of bleeding and injury. - Incisions in this region are often less effective for draining fluids that tend to collect in the more dependent parts of the middle ear. *Posterosuperior* - While somewhat accessible, the **posterosuperior quadrant** carries a higher risk of damaging the **incus** and **stapes**, as well as the **facial nerve** or **chorda tympani nerve**. - Its elevated position also makes it less ideal for gravity-dependent drainage of purulent fluid from the middle ear.

Question 326: Which of the following conditions is characterized by purulent discharge and otalgia, often with tympanic membrane rupture?

A. Acute Mastoiditis
B. Meniere’s disease
C. Acute Suppurative Otitis Media (Correct Answer)
D. Otosclerosis

Explanation: ***Acute Suppurative Otitis Media*** - This condition is characterized by **inflammation** and **infection of the middle ear**, which often leads to the accumulation of pus (purulent discharge). - The pressure from the accumulated pus can cause severe **otalgia** (**ear pain**) and lead to **tympanic membrane rupture**, releasing the purulent discharge. *Acute Mastoiditis* - This is a serious complication of **acute otitis media** where the infection spreads to the **mastoid air cells**, causing inflammation and bone destruction. - While it can present with fever, postauricular pain, and discharge, the defining characteristic of **mastoiditis** is often **postauricular tenderness** and **erythema** with protrusion of the auricle, rather than rupture of the tympanic membrane as the primary symptom. *Meniere’s disease* - This is a disorder of the **inner ear** characterized by episodes of **vertigo**, **tinnitus**, **hearing loss**, and a feeling of **fullness in the ear**. - It does not involve infection, purulent discharge, or tympanic membrane rupture. *Otosclerosis* - This condition involves **abnormal bone growth** in the middle ear, particularly around the **stapes bone**, leading to **conductive hearing loss**. - It presents with progressive hearing loss and sometimes tinnitus but is not associated with infection, pain, discharge, or tympanic membrane rupture.

Question 327: Regarding the stapedial reflex, which of the following is true?

A. It helps to enhance the sound conduction in middle ear
B. It is a protective reflex against loud sound (Correct Answer)
C. It helps in masking the sound waves
D. It is unilateral reflex

Explanation: ***It is a protective reflex against loud sound*** - The stapedial reflex, also known as the **acoustic reflex**, primarily functions to contract the **stapedius muscle** in response to loud sounds. - This contraction stiffens the ossicular chain, reducing the transmission of sound energy to the inner ear, thereby protecting it from **acoustic trauma**. *It helps to enhance the sound conduction in middle ear* - The stapedial reflex's primary action is to **dampen** sound transmission, not enhance it. - By stiffening the ossicular chain, it **attenuates** low-frequency sounds, which is opposite to enhancing conduction. *It helps in masking the sound waves* - Masking refers to the phenomenon where one sound makes another sound inaudible or harder to hear, typically due to similar frequencies. - The stapedial reflex **reduces overall sound intensity** reaching the inner ear and does not specifically mask certain frequencies over others. *It is unilateral reflex* - The stapedial reflex is a **bilateral reflex**, meaning that a loud sound presented to one ear typically elicits a contraction of the stapedius muscle in **both ears**. - This bilateral response is mediated through auditory pathways involving the brainstem.

Question 328: Which of the following is the earliest and consistent symptom of a glomus tumor?

A. Hoarseness
B. Tinnitus (Correct Answer)
C. Otorrhea
D. Dysphagia

Explanation: **Tinnitus** - As glomus tumors are typically **vascular**, the earliest and most consistent symptom is often **pulsatile tinnitus**, a sound synchronous with the patient's heartbeat. - This symptom arises from blood flow through the tumor, which is usually located in the **middle ear** or **jugular bulb**. *Hoarseness* - Hoarseness is a potential symptom if the tumor extends to involve the **vagus nerve (CN X)**, but this typically occurs in **later stages** as the tumor grows significantly. - It is not considered an **early or consistent** symptom as it requires more extensive disease. *Otorrhea* - Otorrhea, or ear discharge, may occur if the tumor erodes through the **tympanic membrane** or causes secondary infection. - This is a symptom of **advanced disease** or complications, not an early presentation. *Dysphagia* - Dysphagia, or difficulty swallowing, suggests involvement of **cranial nerves IX, X, or XI**, which is associated with large, advanced tumors. - It is a **late symptom** and indicates significant tumor extension.

Question 329: What is the condition characterized by complete absence of the inner ear structures (labyrinthine aplasia)?

A. Michel dysplasia (Correct Answer)
B. Mondini dysplasia
C. Bing-Siebenmann dysplasia
D. Scheibe dysplasia

Explanation: ***Michel dysplasia*** - This condition represents the **most severe form** of inner ear malformation, characterized by **complete absence** of the inner ear structures, including the **cochlea** and **vestibule**. - It results from an arrest in fetal development at an early stage (around the 3rd week of gestation) and is associated with **profound sensorineural hearing loss**. *Mondini dysplasia* - This dysplasia is characterized by a **single, common cavity** for the cochlea, which normally has 2.5 turns, appearing as only 1.5 turns. - It involves incomplete development of membranous and/or bony labyrinths and is associated with **moderate to severe hearing loss**. *Bing-Siebenmann dysplasia* - This refers to a malformation primarily affecting the **membranous labyrinth** of the cochlea, with a normally formed bony labyrinth. - It is a rare cause of congenital hearing loss and the bony structures of the inner ear appear normal on imaging. *Scheibe dysplasia* - This is the **most common type** of inner ear malformation, affecting the **membranous cochlea** and **saccule**, while the bony structures and the utricle and semicircular canals are usually normal. - It is frequently associated with **genetic syndromes** and can lead to sensorineural hearing loss.

Question 330: 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.

Practice by Chapter

Otitis Externa

Practice Questions

Acute Otitis Media

Practice Questions

Chronic Otitis Media

Practice Questions

Complications of Otitis Media

Practice Questions

Otosclerosis

Practice Questions

Presbycusis

Practice Questions

Sudden Sensorineural Hearing Loss

Practice Questions

Noise-Induced Hearing Loss

Practice Questions

Ménière's Disease

Practice Questions

Benign Paroxysmal Positional Vertigo

Practice Questions

Vestibular Neuritis

Practice Questions

Tumors of the Ear and Temporal Bone

Practice Questions

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