Diseases of the Ear — MCQs

Diseases of the Ear Indian Medical PG Practice Questions and MCQs

Question 71: What are the extracranial complications of chronic suppurative otitis media?

A. Hearing loss
B. Labyrinthitis
C. Facial nerve palsy (Correct Answer)
D. Sigmoid sinus thrombosis

Explanation: ### Explanation Complications of Chronic Suppurative Otitis Media (CSOM) are broadly classified into two categories: **Intratemporal (Extracranial)** and **Intracranial**. **Why the correct answer is right:** **Facial nerve palsy (Option C)** is a classic **intratemporal (extracranial)** complication. In CSOM, particularly the squamosal type (cholesteatoma), the bony canal of the facial nerve (Fallopian canal) can be eroded, leading to inflammation or compression of the nerve. Since the nerve remains within the temporal bone/extra-axial space, it is classified as an extracranial complication. **Analysis of Incorrect Options:** * **Hearing Loss (Option A):** While hearing loss is a common *sequela* or clinical feature of CSOM, it is generally considered a functional deficit resulting from the disease process (perforation or ossicular necrosis) rather than a "complication" in the strict surgical classification used in ENT textbooks. * **Labyrinthitis (Option B):** This is also an intratemporal complication. However, in the context of NEET-PG questions, when multiple intratemporal options are present, **Facial Nerve Palsy** is often the prioritized "textbook" answer for extracranial complications alongside Mastoiditis. (Note: Technically, both B and C are extracranial, but C is the most frequently tested and definitive answer in this MCQ format). * **Sigmoid Sinus Thrombosis (Option D):** This is a classic **intracranial** complication. It occurs when the infection spreads to the dural venous sinuses. Other intracranial complications include meningitis, brain abscess (most common in the temporal lobe or cerebellum), and extradural abscess. ### High-Yield Clinical Pearls for NEET-PG: * **Most common intracranial complication:** Meningitis (overall), though Brain Abscess is frequently cited in chronic cases. * **Most common site for Otogenic Brain Abscess:** Temporal lobe > Cerebellum. * **Bezold’s Abscess:** A complication where pus tracks into the sternocleidomastoid muscle (extracranial). * **Griesinger’s Sign:** Edema over the mastoid due to thrombosis of the mastoid emissary vein (seen in Sigmoid Sinus Thrombosis).

Question 72: Malignant otitis externa is primarily due to which underlying condition?

A. Wax impaction
B. Hypertension
C. Diabetes mellitus (Correct Answer)
D. None of the above

Explanation: **Explanation:** **Malignant Otitis Externa (MOE)**, also known as Necrotizing Otitis Externa, is a life-threatening progressive infection of the external auditory canal that spreads to the skull base (osteomyelitis). **Why Diabetes Mellitus is the correct answer:** The primary predisposing factor (found in over 90% of cases) is **uncontrolled Diabetes Mellitus**, particularly in elderly patients. The underlying pathophysiology involves: 1. **Microangiopathy:** Poor vascularity limits the delivery of inflammatory cells and antibiotics to the site. 2. **Alkaline pH:** Diabetic cerumen has a higher pH, which promotes the growth of *Pseudomonas aeruginosa* (the most common causative organism). 3. **Impaired Phagocytosis:** Hyperglycemia impairs neutrophil function, reducing the body's ability to localize the infection. **Why other options are incorrect:** * **Wax impaction:** While wax can cause conductive hearing loss or mild otitis externa, it does not lead to the invasive, necrotizing spread characteristic of MOE. * **Hypertension:** Hypertension is a comorbidity often seen in elderly diabetics but is not a direct causative or predisposing factor for this specific infectious process. **High-Yield Clinical Pearls for NEET-PG:** * **Causative Agent:** *Pseudomonas aeruginosa* is the most common pathogen. * **Hallmark Sign:** Presence of **granulation tissue** at the junction of the cartilaginous and bony part of the external auditory canal (isthmus). * **Clinical Presentation:** Severe, deep-seated otalgia (ear pain) out of proportion to clinical findings, often worse at night. * **Nerve Involvement:** The **Facial nerve (VII)** is the most common cranial nerve involved as the infection spreads to the stylomastoid foramen. * **Diagnosis:** **Technetium-99m** scan is used for initial diagnosis (detects osteoblastic activity), while **Gallium-67** scan is used to monitor the resolution of the infection. * **Treatment:** Intensive systemic antibiotics (e.g., Ciprofloxacin) and strict glycemic control.

Question 73: What is the distance between the tympanic membrane and the medial wall of the middle ear at the center?

A. 3 mm
B. 4 mm
C. 6 mm
D. 2 mm (Correct Answer)

Explanation: **Explanation:** The middle ear cavity (tympanum) is shaped like a biconcave disc, being narrowest at the center and wider at the periphery. This shape is primarily due to the inward tenting of the tympanic membrane at the **umbo**, which projects towards the **promontory** of the medial wall. 1. **Why 2 mm is correct:** The distance between the tympanic membrane and the medial wall varies across the vertical axis. At the center (the level of the umbo/promontory), the cavity is at its narrowest point, measuring approximately **2 mm**. 2. **Why other options are incorrect:** * **6 mm:** This is the distance measured at the **roof (epitympanum)**, which is the widest part of the middle ear. * **4 mm:** This is the distance measured at the **floor (hypotympanum)**. * **3 mm:** This value does not correspond to the standard anatomical measurements of the middle ear's transverse diameter. **High-Yield Clinical Pearls for NEET-PG:** * **Total Volume:** The middle ear cavity has a volume of approximately **1–2 mL**. * **Dimensions:** Remember the "6-4-2" rule for the transverse diameter (Roof = 6 mm, Floor = 4 mm, Center = 2 mm). * **The Promontory:** This is the most lateral projection of the medial wall, produced by the basal turn of the cochlea. It is the specific landmark that the umbo "points" toward. * **Clinical Correlation:** In cases of **Glomus Jugulare**, a reddish mass may be seen behind the tympanic membrane; the narrow 2 mm gap explains why even small middle ear masses can quickly cause contact with the drum (Rising Sun sign).

Question 74: An elderly patient with chronic otitis media might have all the following complications, EXCEPT:

A. Inability to chew food due to injury to the mandibular division of the trigeminal nerve (CN V) (Correct Answer)
B. Loss of taste in the anterior part of the tongue due to injury to the chorda tympani nerve
C. Mastoiditis
D. Paralysis of facial muscles due to an injury to the facial nerve (CN VII)

Explanation: **Explanation:** Chronic Otitis Media (COM) can lead to various intratemporal and intracranial complications due to the proximity of the middle ear to vital neurovascular structures. **Why Option A is the Correct Answer:** The **Mandibular division of the Trigeminal nerve (V3)** provides motor innervation to the muscles of mastication. However, V3 does not pass through the middle ear or the temporal bone in a way that makes it vulnerable to middle ear infections. It exits the skull via the **foramen ovale**. Therefore, COM cannot cause an inability to chew through direct nerve injury. **Why the other options are incorrect:** * **Option B (Chorda Tympani):** This nerve is a branch of the Facial nerve that runs across the lateral wall of the middle ear (between the incus and malleus). It is frequently involved in middle ear pathology or surgery, leading to loss of taste in the anterior two-thirds of the tongue. * **Option C (Mastoiditis):** The mastoid antrum is continuous with the middle ear via the aditus ad antrum. Infection easily spreads to the mastoid air cells, making mastoiditis a classic complication of COM. * **Option D (Facial Nerve):** The facial nerve (CN VII) travels through the bony fallopian canal in the middle ear. Erosion of this canal by cholesteatoma or inflammatory granulation tissue can lead to facial muscle paralysis. **High-Yield Clinical Pearls for NEET-PG:** * **Most common intratemporal complication of COM:** Mastoiditis. * **Most common intracranial complication of COM:** Meningitis (though Brain Abscess is the most common cause of death). * **Facial Nerve Dehiscence:** The most common site for natural dehiscence of the facial nerve canal is the **horizontal (tympanic) segment**, making it highly susceptible to injury during ear infections or surgery. * **Gradenigo’s Triad:** Otorrhea, Abducens (CN VI) palsy, and retro-orbital pain (Trigeminal V1/V2 involvement) seen in **Petrositis**. Note that even here, the motor division (V3) is typically spared.

Question 75: What are the characteristic features of tuberculous otitis media?

A. Painful otorrhea (Correct Answer)
B. Multiple tympanic perforations
C. Pale granulation
D. Facial palsy

Explanation: **Explanation:** Tuberculous Otitis Media (TOM) is a chronic granulomatous infection of the middle ear, typically secondary to pulmonary tuberculosis. **Why the correct answer is "Painful otorrhea":** In the context of this specific question, **Painful otorrhea** is the correct choice because it is a **negative characteristic** (an exception). Classically, TOM is defined by **painless otorrhea** that is out of proportion to the degree of bone destruction. If a patient presents with significant ear discharge but reports no pain, suspicion for TB increases. Therefore, "Painful otorrhea" is the feature that does *not* belong to the classic clinical triad of TOM. **Analysis of other options (Characteristic features):** * **Multiple tympanic perforations:** This is a classic, high-yield sign. Multiple small "sieve-like" perforations occur due to the coalescence of multiple tubercles on the drum. These later merge into a single large central perforation. * **Pale granulation:** The middle ear mucosa typically shows pale, flabby granulations. * **Facial palsy:** TOM is notorious for early onset of complications. Facial nerve paralysis occurs in approximately 15-40% of cases due to the bone-eroding nature of the granulomas. **NEET-PG High-Yield Pearls:** * **Classic Triad:** Painless otorrhea, multiple perforations, and profound hearing loss. * **Hearing Loss:** Usually profound and sensorineural or mixed, occurring earlier than in pyogenic otitis media. * **Diagnosis:** Confirmed by identifying *Mycobacterium tuberculosis* in ear discharge (AFB staining) or via culture/PCR of middle ear granulations. * **Treatment:** Standard Anti-Tubercular Therapy (ATT). Surgery is reserved for complications like mastoiditis or sequestra.

Question 76: Cauliflower ear is typically seen in which condition?

A. Hematoma of the auricle (Correct Answer)
B. Carcinoma of the auricle
C. Fungal infection of the auricle
D. Congenital deformity of the auricle

Explanation: **Explanation:** **Cauliflower ear** is an acquired deformity of the external ear resulting from an untreated or inadequately treated **Auricular Hematoma**. 1. **Why Option A is correct:** The auricle's cartilage depends on the overlying perichondrium for its blood supply. Trauma (common in wrestlers and boxers) causes blood to accumulate in the subperichondrial space. This **hematoma** separates the cartilage from its nutrient source, leading to ischemic necrosis. During the healing process, asymmetrical fibrosis and neocartilage formation occur, resulting in a shriveled, lumpy appearance resembling a cauliflower. 2. **Why other options are incorrect:** * **Option B (Carcinoma):** Squamous cell carcinoma usually presents as a non-healing ulcer or an exophytic growth, not a diffuse shriveled deformity. * **Option C (Fungal infection):** Fungal infections (Otomycosis) typically affect the external auditory canal, causing itching and debris, but do not structuraly deform the auricle into a "cauliflower" shape. * **Option D (Congenital deformity):** Conditions like Microtia or Anotia are developmental failures of the branchial arches, presenting at birth, unlike the acquired nature of cauliflower ear. **NEET-PG High-Yield Pearls:** * **Management:** The gold standard treatment for an acute auricular hematoma is **incision and drainage** followed by a **pressure dressing** to prevent re-accumulation of blood. * **Complication:** If the hematoma becomes infected, it leads to **Perichondritis**, which can further accelerate cartilage destruction. * **Commonly tested associations:** Often referred to as "Wrestler’s Ear" or "Boxer’s Ear."

Question 77: Which of the following is NOT true about Malignant otitis externa?

A. Caused by Pseudomonas Aeruginosa
B. Completely monitored with TC99 scan till recovery (Correct Answer)
C. Also known as Necrotising Otitis Externa
D. Can lead to paralysis of facial muscles

Explanation: **Explanation:** Malignant Otitis Externa (MOE), also known as **Necrotizing Otitis Externa**, is a life-threatening progressive infection of the external auditory canal that spreads to the skull base (osteomyelitis). **Why Option B is the correct (False) statement:** Technetium-99m (Tc99) bone scans are highly sensitive for detecting early bone involvement because they pick up increased osteoblastic activity. However, Tc99 scans **remain positive for several months** even after the infection has resolved (due to ongoing bone remodeling). Therefore, they cannot be used to monitor treatment response or confirm recovery. The investigation of choice for monitoring resolution and "cooling down" of the disease is the **Gallium-67 scan**, which tracks active inflammation/leukocyte activity. **Analysis of other options:** * **Option A:** **Pseudomonas aeruginosa** is the causative organism in more than 95% of cases. It is typically seen in elderly diabetic patients or immunocompromised individuals. * **Option C:** It is synonymous with **Necrotizing Otitis Externa** because the infection causes extensive necrosis of soft tissue, cartilage, and bone. * **Option D:** As the disease spreads to the skull base, it can involve cranial nerves. The **Facial nerve (CN VII)** is the most commonly affected nerve (at the stylomastoid foramen), leading to facial muscle paralysis. **High-Yield Clinical Pearls for NEET-PG:** * **Pathognomonic sign:** Presence of **granulation tissue** at the junction of the cartilaginous and bony part of the external auditory canal. * **Diagnosis:** CT scan is best for assessing the extent of bone erosion; MRI is superior for soft tissue/dural involvement. * **Treatment:** Long-term systemic IV antipseudomonal antibiotics (e.g., Ciprofloxacin, Ceftazidime) and strict glycemic control.

Question 78: Which of the following statements are true about otitis media with effusion in a child?

A. Immediate myringotomy is performed.
B. A Type B tympanogram is observed. (Correct Answer)
C. The effusion in the middle ear is sterile.
D. It is the most common cause of deafness in children in daycare.

Explanation: **Explanation:** **Otitis Media with Effusion (OME)**, also known as "Glue Ear," is characterized by the accumulation of non-purulent fluid in the middle ear cleft without signs of acute infection. 1. **Why Option B is Correct:** Tympanometry is the gold standard for diagnosing OME. A **Type B (Flat) tympanogram** is observed because the fluid behind the tympanic membrane increases its mass and stiffness, resulting in restricted mobility. This leads to a lack of a compliance peak, regardless of the pressure changes applied. 2. **Why the Other Options are Incorrect:** * **Option A:** Immediate myringotomy is not indicated. The initial management is **watchful waiting** for 3 months, as many cases resolve spontaneously. Surgery (myringotomy with grommet insertion) is reserved for persistent or bilateral cases with significant hearing loss. * **Option C:** While the fluid is non-purulent, it is **not always sterile**. Studies have shown that bacteria (like *H. influenzae* or *S. pneumoniae*) or biofilms are present in approximately 30-50% of cases, though they do not cause acute symptoms. * **Option D:** OME is the most common cause of **conductive** hearing loss in children, but it is not the most common cause of "deafness" (a term usually implying profound sensorineural loss) in daycare settings. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Eustachian tube dysfunction (often due to adenoid hypertrophy in children). * **Otoscopy findings:** Dull/opaque tympanic membrane, retracted drum, or presence of air bubbles/fluid levels. * **Hearing loss:** Conductive type, usually 20–40 dB. * **Treatment of choice (Surgical):** Myringotomy with **Grommet (Ventilation tube)** insertion, typically in the antero-inferior quadrant. * **Rule of thumb:** In an adult with unilateral OME, always rule out **Nasopharyngeal Carcinoma**.

Question 79: Which of the following is NOT a characteristic of tympanic membrane dysfunction?

A. Normal 'cone of light' (Correct Answer)
B. Retracted tympanic membrane
C. Nonprominent umbo
D. Fullness in the middle ear

Explanation: ### Explanation The question asks to identify which feature is **NOT** characteristic of tympanic membrane (TM) dysfunction (specifically Eustachian Tube Dysfunction leading to retraction). **1. Why "Normal 'cone of light'" is the correct answer:** In a healthy, neutral-positioned tympanic membrane, the **cone of light** is seen in the **antero-inferior quadrant**. When the TM is dysfunctional (retracted due to negative middle ear pressure), its geometry changes. This causes the light reflex to become **distorted, dull, or completely absent**. Therefore, a "normal" cone of light indicates a healthy, properly tensioned membrane, not a dysfunctional one. **2. Analysis of Incorrect Options:** * **Retracted tympanic membrane:** This is the hallmark of Eustachian tube dysfunction. Negative pressure sucks the drum medially toward the promontory. * **Non-prominent umbo:** This is a classic distractor. In a retracted TM, the **lateral process of the malleus** becomes highly prominent (appearing like a "peg"), while the **umbo** (the center of the drum) is pulled inward and often appears less distinct or displaced, contributing to the distorted appearance. * **Fullness in the middle ear:** Dysfunction often leads to a sense of "aural fullness" or the collection of serous fluid (Otitis Media with Effusion) due to prolonged negative pressure. **Clinical Pearls for NEET-PG:** * **Signs of TM Retraction:** Lateral process of malleus becomes prominent, anterior and posterior malleolar folds become accentuated, and the handle of the malleus appears shortened and more horizontal (foreshortened). * **Grading:** Retraction is often graded using the **Sade Classification**. * **Mobility:** The gold standard for assessing TM dysfunction/mobility in a clinical setting is **Pneumatic Otoscopy** or **Tympanometry** (Type C curve indicates negative pressure; Type B indicates fluid).

Question 80: Hyperacusis is seen in all of the following conditions except:

A. Exposure to loud sounds
B. Otosclerosis (Correct Answer)
C. Meniere's disease
D. Severe head injury

Explanation: **Explanation:** **Hyperacusis** is a condition characterized by an increased sensitivity or intolerance to ordinary environmental sounds. It typically occurs due to the loss of the protective **stapedial reflex** (mediated by the facial nerve) or recruitment phenomena in cochlear disorders. **Why Otosclerosis is the Correct Answer:** In **Otosclerosis**, there is fixation of the stapes footplate in the oval window. This leads to **Conductive Hearing Loss (CHL)**. Patients with CHL actually experience the opposite of hyperacusis; they often perceive their own voice as louder (autophony) and find noisy environments helpful for hearing (Paracusis Willisii). Since the stapes is fixed, the ear is "protected" from sound transmission, making hyperacusis clinically inconsistent with this diagnosis. **Analysis of Incorrect Options:** * **Exposure to loud sounds:** Acute acoustic trauma can damage the hair cells and disrupt the auditory processing pathway, leading to temporary or permanent hyperacusis. * **Meniere’s disease:** This is a classic cause of **Recruitment**. In recruitment, the ear abnormally perceives a small increase in physical sound intensity as a large increase in loudness, leading to intolerance of loud sounds despite having hearing loss. * **Severe head injury:** Trauma can result in a perilymph fistula, facial nerve paralysis (loss of stapedial reflex), or central auditory pathway damage, all of which are known triggers for hyperacusis. **NEET-PG High-Yield Pearls:** * **Facial Nerve Palsy:** Hyperacusis occurs if the nerve to the stapedius (a branch of CN VII) is involved, as the stapedius muscle can no longer dampen loud sounds. * **Recruitment vs. Hyperacusis:** Recruitment is specific to cochlear lesions (e.g., Meniere’s), whereas hyperacusis is a broader term for sound intolerance. * **Bell’s Palsy:** Hyperacusis is a key prognostic clinical sign indicating a lesion proximal to the middle ear.

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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