Diseases of the Ear Practice Questions

Q: Which of the following venous sinuses is more likely to be affected with thrombosis in chronic otitis media and mastoiditis?

Sigmoid. **Explanation:** The **sigmoid sinus** is the most commonly affected venous sinus in Chronic Otitis Media (COM) and mastoiditis due to its close anatomical proximity. It lies in a deep groove on the inner aspect of the mastoid bone, separated from the mastoid air cells only by a thin plate of bone called the **Trautmann’s triangle**. In chronic infections (especially with cholesteatoma), this bone can erode, leading to perisinus abscess formation and subsequent **thrombophlebitis** (Greisinger’s sign). **Analysis of Options:** * **Sigmoid Sinus (Correct):** Its direct contact with the mastoid antrum and air cells makes it the primary site for lateral sinus thrombosis following middle ear infections. * **Cavernous Sinus:** Typically involved in infections of the "danger area" of the face, ethmoid/sphenoid sinusitis, or orbital cellulitis. It is not anatomically adjacent to the mastoid. * **Inter-Cavernous Sinus:** These connect the two cavernous sinuses and are involved secondary to cavernous sinus thrombosis. * **Superior Petrosal Sinus:** While it communicates with the sigmoid sinus, it is rarely the primary site of thrombosis in otogenic infections. **High-Yield Clinical Pearls for NEET-PG:** * **Griesinger’s Sign:** Edema over the mastoid process due to thrombosis of the mastoid emissary vein (pathognomonic for sigmoid sinus thrombosis). * **Delta Sign:** Seen on contrast-enhanced CT, showing a triangular area of enhancement around a non-enhancing clot in the sinus. * **Tobey-Ayer Test:** A clinical test during lumbar puncture where compression of the internal jugular vein on the affected side fails to raise CSF pressure. * **Treatment:** Intravenous antibiotics and cortical/radical mastoidectomy to remove the source of infection.

Q: What is true regarding a preauricular sinus?

Improper fusion of auricular tubercles. ### Explanation **1. Why Option A is Correct:** The auricle (pinna) develops from the **six auricular hillocks of His**, which are derived from the first and second branchial arches. A preauricular sinus is a congenital malformation caused by the **incomplete fusion or entrapment of these ectodermal tubercles** during the 6th week of gestation. It is most commonly located at the anterior margin of the ascending limb of the helix. **2. Why Other Options are Incorrect:** * **Option B:** A persistent opening of the first branchial arch (or cleft) typically results in a **First Branchial Cleft Cyst or Fistula**. These are distinct from preauricular sinuses; they often involve the external auditory canal or the angle of the mandible and may have a tract related to the facial nerve. * **Option C:** While many cases are sporadic, familial cases of preauricular sinus follow an **Autosomal Dominant** pattern with incomplete penetrance, not autosomal recessive. * **Option D:** Since B and C are incorrect, "All of the above" is invalid. **3. Clinical Pearls for NEET-PG:** * **Location:** Usually found **anterior to the tragus** or the ascending limb of the helix. * **Clinical Presentation:** Most are asymptomatic. However, if infected, they present with pain, swelling, and discharge. * **Management:** Asymptomatic sinuses require no treatment. For recurrent infections, **surgical excision (the Supra-auricular approach)** is the treatment of choice. * **Associated Syndrome:** If a preauricular sinus is seen with hearing loss and branchial fistulae/cysts, suspect **Branchio-Oto-Renal (BOR) Syndrome**. Always check for renal anomalies in such cases.

Q: A 40-year-old male presents with left ear discharge and mild ear pain for the past 7 years. There is no history of deafness. On examination, discharge is seen coming from the posterior superior wall of the ear canal. The tympanic membrane appears normal. Which of the following is the most likely diagnosis?

Chronic otitis externa. **Explanation:** The clinical presentation hinges on the location of the discharge and the status of the tympanic membrane. **1. Why Chronic Otitis Externa (COE) is correct:** The key finding is discharge originating from the **posterior-superior wall of the external auditory canal (EAC)** while the **tympanic membrane (TM) remains normal**. In COE, chronic inflammation of the canal skin leads to persistent or recurrent discharge and mild pain (itching/discomfort). Since the pathology is confined to the EAC, hearing remains unaffected, explaining the absence of deafness. **2. Why other options are incorrect:** * **Chronic Suppurative Otitis Media (CSOM):** This involves the middle ear cleft. It typically presents with a **perforated TM** and some degree of **conductive hearing loss**. A normal TM effectively rules out CSOM. * **Keratosis Obturans:** This is characterized by the accumulation of desquamated keratin in the EAC. While it can cause pain and discharge (if infected), it typically causes **conductive hearing loss** due to canal occlusion and often shows "ballooning" or erosion of the bony canal on examination. * **Carcinoma of the EAC:** While it can present with pain and discharge, it is usually associated with a visible **proliferative mass or ulcer**, blood-stained discharge, and often involves cranial nerve palsies or significant hearing loss in advanced stages. **Clinical Pearls for NEET-PG:** * **Normal TM + Ear Discharge** = Think of pathology localized to the External Auditory Canal (e.g., Otitis Externa, Furuncle). * **Posterior-superior wall involvement:** In the context of a normal TM, this points toward the skin of the bony-cartilaginous junction of the EAC. * **Differential Diagnosis:** If the discharge were coming from a retraction pocket in the posterior-superior *pars tensa*, it would indicate Cholesteatoma (Attico-antral CSOM), but the TM would not be "normal."

Q: A 7-year-old boy with severe otitis media and mastoiditis underwent surgery. Postoperatively, he developed right corner of the mouth drooping, inability to close his right eye, and food collection in his right oral vestibule. Which nerve was most likely injured during the surgery?

Facial nerve. ### Explanation **Correct Option: C. Facial Nerve** The clinical presentation describes a classic case of **Lower Motor Neuron (LMN) Facial Nerve Palsy**. The facial nerve (CN VII) has a long and tortuous course through the temporal bone, specifically within the bony Fallopian canal. During mastoid surgery (like mastoidectomy for mastoiditis), the nerve is highly vulnerable to injury, particularly in its **tympanic (horizontal)** and **mastoid (vertical)** segments. * **Inability to close the eye:** Due to paralysis of the *Orbicularis oculi*. * **Drooping of the corner of the mouth:** Due to paralysis of the *Zygomaticus* and *Risorius* muscles. * **Food collection in the vestibule:** Due to paralysis of the *Buccinator* muscle, which normally maintains cheek tension to prevent food stasis. **Why Incorrect Options are Wrong:** * **A & B (Glossopharyngeal & Vagus):** These nerves exit the skull via the jugular foramen. Injury would result in dysphagia, loss of gag reflex, or vocal cord palsy, not facial asymmetry. * **D (Maxillary nerve):** This is a sensory branch of the Trigeminal nerve (CN V2). Injury would cause mid-face anesthesia but would not affect the muscles of facial expression. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of injury:** The **horizontal segment** (just above the oval window) is the most common site of surgical trauma, especially if the bone is dehiscent. * **Second Genu:** The nerve is also at risk at the "pyramidal bend" where it turns from horizontal to vertical. * **Landmark for identification:** The **Short process of the Incus** and the **Horizontal Semicircular Canal** are the most reliable surgical landmarks to locate the facial nerve during mastoidectomy. * **Bell’s Phenomenon:** The upward and outward rolling of the eyeball when the patient attempts to close the paralyzed eyelid.

Q: A bluish tympanic membrane is typically seen in which of the following conditions?

Otitis media with effusion (Glue ear). **Explanation:** The color of the tympanic membrane (TM) is a vital diagnostic clue in otology. A **bluish tympanic membrane** is a classic finding in **Otitis Media with Effusion (OME)**, also known as "Glue Ear." This occurs because the middle ear is filled with thick, mucoid fluid instead of air. The combination of the fluid's amber/yellow hue and the underlying dark shadows of the middle ear cleft, viewed through a retracted TM, creates a characteristic blue or "gunmetal grey" appearance. **Analysis of Options:** * **A. Early ASOM:** In the early stages (Stage of Hyperemia), the TM appears **fiery red** due to the engorgement of blood vessels (cartwheel appearance). * **C. Cholesteatoma:** This typically presents as a **pearly white** mass or flake, often associated with a marginal perforation or a retraction pocket in the attic (pars flaccida). * **D. Cholesterol Granuloma:** While this *can* cause a blue TM (often called an "Idiopathic Blue Drum"), it is a rare complication of chronic middle ear negative pressure. In the context of standard NEET-PG questions, OME is the most common and "typical" cause for a bluish/amber drum. **High-Yield Clinical Pearls for NEET-PG:** * **Red TM:** ASOM, Glomus Tumor (Rising sun appearance). * **Pearly White TM:** Normal TM or Cholesteatoma. * **Chalky White Patches:** Tympanosclerosis (hyaline deposits). * **Flamingo Pink Flush:** Otosclerosis (Schwartze sign due to increased vascularity over the promontory). * **B-Type Tympanogram:** Characteristic of OME (flat curve). * **Treatment of Choice for OME:** Myringotomy with Grommet insertion.

Q: What is a characteristic feature of tuberculous otitis media?

Multiple perforations in the tympanic membrane. **Explanation:** Tuberculous Otitis Media (TOM) is a chronic granulomatous infection of the middle ear, usually secondary to pulmonary tuberculosis. **Why Option A is correct:** The hallmark of TOM is the presence of **multiple "sieve-like" perforations** in the tympanic membrane. This occurs because multiple tubercles form on the drum, which then undergo caseous necrosis and break down. Over time, these small perforations may coalesce to form a single, large total perforation. **Analysis of Incorrect Options:** * **B. Mastoiditis:** While mastoid involvement occurs in TOM, it is usually characterized by extensive bone destruction and "painless" sequestration rather than the acute, painful mastoiditis seen in pyogenic infections. * **C. Middle ear effusion:** Effusion is typical of Serous Otitis Media (Eustachian tube dysfunction). TOM is characterized by pale granulation tissue and cheesy (caseous) discharge rather than simple sterile fluid. * **D. Ear discharge:** While ear discharge is present in TOM, it is not a *characteristic* feature because it is common to almost all forms of Otitis Media. In TOM, the discharge is specifically described as **painless, odorless, and watery/scanty.** **High-Yield Clinical Pearls for NEET-PG:** 1. **Classic Triad:** Painless ear discharge + Multiple perforations + Profound hearing loss (out of proportion to clinical findings). 2. **Facial Nerve Paralysis:** TOM is a common cause of facial nerve palsy in chronic ear infections. 3. **Diagnosis:** Confirmed by identifying *Mycobacterium tuberculosis* on Ziehl-Neelsen (ZN) stain or culture of the discharge/granulation tissue. 4. **Appearance:** The tympanic membrane and middle ear mucosa often appear pale and "cadaveric."

Q: What is the most common perforation site in the tympanic membrane in acute suppurative otitis media?

Antero-inferior. ### Explanation In **Acute Suppurative Otitis Media (ASOM)**, the middle ear becomes filled with purulent exudate. As the pressure from this pus increases, it leads to pressure necrosis of the tympanic membrane (TM). The **Antero-inferior quadrant** is the most common site for this perforation because it is the most vascular part of the pars tensa. Increased pressure leads to hyperemia followed by ischemia and subsequent necrosis at this specific site. **Analysis of Options:** * **Antero-inferior (Correct):** This is the classic site for perforation in ASOM. Clinically, this is also the preferred site for **Myringotomy** (specifically the postero-inferior or antero-inferior quadrants) to avoid injury to the ossicles. * **Postero-inferior:** While a common site for safe (mucosal) chronic otitis media perforations, it is not the primary site for the initial rupture in acute stages. * **Antero-superior:** This area is less commonly involved in spontaneous ruptures due to the anatomical orientation of the Eustachian tube and middle ear pressure distribution. * **Postero-superior:** This is a "danger zone." Perforations here are typically associated with **Attico-antral disease (Cholesteatoma)** rather than ASOM. Rupture here risks damage to the incudostapedial joint. **Clinical Pearls for NEET-PG:** * **Pulsatile Otorrhoea:** Known as the **"Lighthouse sign,"** it is seen when pus exudes through a small perforation in the ASOM stage of suppuration. * **Myringotomy Site:** Always performed in the **inferior quadrants** (Antero-inferior or Postero-inferior) to avoid the incus and stapes. * **Cartwheel Appearance:** Seen in the Stage of Hyperemia in ASOM due to radiating vessels over the TM.

Q: Most common site for the initiation of otosclerosis is?

Fissula ante fenestrum. **Explanation:** Otosclerosis is a primary metabolic bone disease of the otic capsule characterized by abnormal bone resorption and deposition. **1. Why Fissula Ante Fenestrum is correct:** The **fissula ante fenestrum** is a small area of vestigial embryonic cartilage located just anterior to the oval window. It is the most common site for the initiation of otosclerotic lesions (found in approximately 80-90% of cases). This area is highly susceptible to remodeling, leading to the formation of a "fossa" of spongy bone which eventually spreads to involve the stapes footplate, causing conductive hearing loss. **2. Why other options are incorrect:** * **Footplate of stapes:** While the footplate is frequently involved as the disease progresses (leading to stapedial fixation), it is usually a secondary site of involvement rather than the point of origin. * **Margins of stapes:** The disease involves the annular ligament and the margins of the oval window, but the pathological process typically starts in the otic capsule bone (fissula) and spreads toward these margins. * **Fissula post fenestrum:** This is located posterior to the oval window. While otosclerosis can occur here, it is significantly less common than involvement of the fissula ante fenestrum. **Clinical Pearls for NEET-PG:** * **Schwartze Sign:** A reddish hue seen behind the tympanic membrane due to increased vascularity in active otosclerosis (promontory). * **Carhart’s Notch:** A characteristic dip in the bone conduction threshold at **2000 Hz**. * **Gelle’s Test:** Negative (indicates stapedial fixation). * **Treatment of Choice:** Stapedotomy (most preferred) or Stapedectomy. * **Medical Management:** Sodium fluoride (used to mature active/spongy lesions).

Question 1

Which of the following venous sinuses is more likely to be affected with thrombosis in chronic otitis media and mastoiditis?

Accepted Answer

Sigmoid

Answer

Cavernous

Answer

Inter-Cavernous

Answer

Superior petrosal

Question 2

What is true regarding a preauricular sinus?

Accepted Answer

Improper fusion of auricular tubercles

Answer

Persistent opening of the first branchial arch

Answer

Autosomal recessive pattern

Answer

All of the above

Question 3

A 40-year-old male presents with left ear discharge and mild ear pain for the past 7 years. There is no history of deafness. On examination, discharge is seen coming from the posterior superior wall of the ear canal. The tympanic membrane appears normal. Which of the following is the most likely diagnosis?

Accepted Answer

Chronic otitis externa

Answer

Chronic suppurative otitis media

Answer

Keratosis obturans

Answer

Carcinoma of the external auditory canal

Question 4

A pregnant woman in her third trimester complains of hearing her own sounds. Examination of the ear shows movements of the tympanic membrane synchronous with respiration and especially exaggerated when the nostril on the contralateral side is occluded. What is your diagnosis?

Accepted Answer

Patulous eustachian tube

Answer

Eustachian tube obstruction

Answer

Otitis media with effusion

Answer

Otosclerosis

Question 5

A 7-year-old boy with severe otitis media and mastoiditis underwent surgery. Postoperatively, he developed right corner of the mouth drooping, inability to close his right eye, and food collection in his right oral vestibule. Which nerve was most likely injured during the surgery?

Accepted Answer

Facial nerve

Answer

Glossopharyngeal nerve

Answer

Vagus nerve

Answer

Maxillary division of the trigeminal nerve

Question 6

A bluish tympanic membrane is typically seen in which of the following conditions?

Accepted Answer

Otitis media with effusion (Glue ear)

Answer

Early acute suppurative otitis media (ASOM)

Answer

Cholesteatoma

Answer

Cholesterol granuloma

Question 7

What is a characteristic feature of tuberculous otitis media?

Accepted Answer

Multiple perforations in the tympanic membrane

Answer

Mastoiditis

Answer

Middle ear effusion

Answer

Ear discharge

Question 8

What is the most common perforation site in the tympanic membrane in acute suppurative otitis media?

Accepted Answer

Antero-inferior

Answer

Postero-inferior

Answer

Antero-superior

Answer

Postero-superior

Question 9

A 18-month-old boy presents with a 2-day history of fever, irritability, and frequent tugging of his left ear. He was diagnosed with acute otitis media and treated with antibiotics. Two months later, otoscopic examination reveals air-fluid levels in the left ear, and medical management has failed to resolve the effusion. What is the treatment of choice for this child?

Accepted Answer

Myringotomy with ventilation tube insertion

Answer

Conservative management

Answer

Tympanoplasty

Answer

Myringotomy with diode laser

Question 10

Most common site for the initiation of otosclerosis is?

Accepted Answer

Fissula ante fenestrum

Answer

Food plate of stapes

Answer

Margins of stapes

Answer

Fissula post fenestrum

Diseases of the Ear — MCQs

Diseases of the Ear — MCQs

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