Diseases of the Ear Practice Questions

Q: All of the following are included in Gradenigo's triad EXCEPT:

Palatal palsy. **Explanation:** **Gradenigo’s Triad** is a classic clinical presentation of **Petrositis** (inflammation of the petrous apex), usually occurring as a complication of acute or chronic otitis media. The triad is caused by the spread of infection to the petrous part of the temporal bone, affecting structures in **Dorello’s canal** and the **Meckel’s cave** area. **Why Palatal Palsy is the Correct Answer:** Palatal palsy involves the Vagus (X) and Glossopharyngeal (IX) nerves. These nerves exit the skull via the jugular foramen, which is anatomically distant from the petrous apex. Therefore, palatal palsy is not a component of Gradenigo’s triad. **Analysis of Incorrect Options (Components of the Triad):** 1. **Abducent Nerve (VI) Palsy:** The 6th cranial nerve passes through Dorello’s canal beneath the petrosphenoid ligament. Inflammation at the petrous apex causes compression, leading to lateral rectus palsy and **diplopia**. 2. **Retro-orbital Pain:** This is due to involvement of the **Trigeminal (V) nerve** (specifically the Gasserian ganglion) in Meckel’s cave. The pain is typically distributed along the ophthalmic division. 3. **Aural Discharge:** Persistent ear discharge (otorrhea) is the third component, signifying the underlying middle ear infection or mastoiditis that led to the petrositis. **High-Yield Clinical Pearls for NEET-PG:** * **Anatomy:** Dorello’s canal is the key anatomical site for VI nerve involvement in petrositis. * **Diagnosis:** Contrast-enhanced MRI is the gold standard to visualize petrous apex opacification. * **Treatment:** Aggressive IV antibiotics and surgical drainage (e.g., cortical mastoidectomy with petrous apicectomy). * **Differential:** Do not confuse this with **Vernet’s Syndrome** (Jugular Foramen Syndrome), which involves CN IX, X, and XI.

Q: Middle ear infections can spread to the brain via all of the following routes, except?

Lymphatic spread. Infections of the middle ear (Otitis Media) can lead to life-threatening intracranial complications (e.g., meningitis, brain abscess) by breaching the anatomical barriers. **Why Lymphatic Spread is the Correct Answer:** The middle ear and the intracranial cavity do not share a direct or continuous lymphatic drainage system. Lymphatic drainage from the middle ear primarily flows towards the parotid, retroauricular, and deep cervical nodes. Therefore, **lymphatic spread** is not a recognized route for the intracranial spread of ear infections. **Analysis of Other Options:** * **Direct Bony Invasion (Option A):** This is the most common route, especially in chronic suppurative otitis media (CSOM) with cholesteatoma. Bone is destroyed by osteoclastic activity or pressure necrosis, allowing infection to reach the dura of the middle or posterior cranial fossa. * **Oval / Round Window (Option B):** These are pre-formed pathways. Infection can spread from the middle ear into the inner ear (labyrinthitis) via these windows, and subsequently to the meninges through the internal auditory canal or the cochlear aqueduct. * **Hematogenous Spread (Option C):** Infection can spread via retrograde thrombophlebitis. Small emissary veins connect the middle ear mucosa to the dural venous sinuses (like the sigmoid sinus), allowing bacteria to bypass bony barriers. **High-Yield Clinical Pearls for NEET-PG:** * **Most common intracranial complication of ASOM:** Meningitis. * **Most common intracranial complication of CSOM:** Extradural abscess. * **Korner’s Septum:** A persistent petrosquamosal suture that can trap infection in the mastoid, potentially leading to intracranial spread. * **Citelli’s Angle:** The sinodural angle; it is a key surgical landmark during mastoidectomy to locate the dura and sigmoid sinus.

Q: Upper limb non-suppurative otitis media in adults is due to:

Malignancy. **Explanation:** The correct answer is **Malignancy**. In adults, the presence of **unilateral** non-suppurative otitis media (also known as Otitis Media with Effusion or Serous Otitis Media) is considered a **"red flag"** sign. **1. Why Malignancy is the correct answer:** The underlying medical concept is the obstruction of the **Eustachian tube**. In adults, a tumor in the **Nasopharynx** (specifically Nasopharyngeal Carcinoma) can block the pharyngeal opening of the Eustachian tube. This leads to negative middle ear pressure, transudation of fluid, and subsequent conductive hearing loss. In any adult presenting with new-onset unilateral serous otitis media, **Nasopharyngoscopy** is mandatory to rule out a malignancy in the Fossa of Rosenmüller. **2. Why other options are incorrect:** * **Allergic Rhinitis & URTI:** While these are common causes of Eustachian tube dysfunction, they typically present with **bilateral** symptoms and are more frequently associated with pediatric populations or acute, self-limiting episodes in adults. * **Trauma:** Barotrauma can cause middle ear effusion, but it is usually associated with a clear history of pressure changes (e.g., diving or flying) and is not the primary suspicion for spontaneous non-suppurative otitis in an adult. **Clinical Pearls for NEET-PG:** * **Trotter’s Triad:** Diagnostic for Nasopharyngeal Carcinoma; includes (1) Conductive deafness (due to SOM), (2) Ipsilateral soft palate paralysis, and (3) Trigeminal neuralgia (V2 distribution). * **Grommet Insertion:** If medical management fails, a myringotomy with grommet insertion is the treatment of choice for the ear symptoms, but the primary malignancy must be addressed first. * **Rule of Thumb:** Unilateral SOM in a child = Adenoid hypertrophy; Unilateral SOM in an adult = Nasopharyngeal Carcinoma.

Q: While ear toileting, water is pushed along which wall of the external auditory canal?

Posterosuperior wall. **Explanation:** The correct technique for ear syringing (ear toileting) involves directing the stream of water along the **posterosuperior wall** of the external auditory canal (EAC). **Why Posterosuperior?** The primary objective of ear syringing is to create a pressure gradient behind the wax or debris to flush it out. When water is directed towards the posterosuperior wall, it follows the curvature of the canal, travels behind the wax bolus, and hits the tympanic membrane. The water then reflects back, pushing the wax out from behind. This specific direction is chosen because the posterosuperior wall is relatively less sensitive and provides the most direct path to the "space" behind the obstruction. **Analysis of Incorrect Options:** * **Anterosuperior/Anteroinferior walls:** Directing water anteriorly is less effective because the EAC has an anterior recess (a dip near the tympanic membrane). Water directed here tends to get trapped or push the wax deeper into the recess, making removal more difficult. * **Posteroinferior wall:** While posterior, the inferior aspect is more likely to cause the water to strike the wax head-on rather than getting behind it, potentially impacting the wax further against the eardrum. **Clinical Pearls for NEET-PG:** * **Temperature:** Water must be at body temperature (**37°C**). If it is too cold or too hot, it induces the **caloric reflex**, leading to vertigo, nystagmus, and vomiting. * **Direction of Pull:** To straighten the EAC during the procedure, pull the pinna **upwards and backwards** in adults (downwards and backwards in infants). * **Contraindications:** Never perform syringing if there is a history of **tympanic membrane perforation**, previous ear surgery, or if the patient has an active infection (Otitis Externa). * **Complications:** The most common complication is trauma to the canal wall or iatrogenic perforation of the tympanic membrane.

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.

Question 1

All of the following are included in Gradenigo's triad EXCEPT:

Accepted Answer

Palatal palsy

Answer

Abducent nerve palsy

Answer

Retro-orbital pain

Answer

Aural discharge

Question 2

Middle ear infections can spread to the brain via all of the following routes, except?

Accepted Answer

Lymphatic spread

Answer

Direct Bony Invasion

Answer

Oval / Round window

Answer

Hematogenous spread

Question 3

Upper limb non-suppurative otitis media in adults is due to:

Accepted Answer

Malignancy

Answer

Allergic rhinitis

Answer

Upper respiratory tract infection

Answer

Trauma

Question 4

While ear toileting, water is pushed along which wall of the external auditory canal?

Accepted Answer

Posterosuperior wall

Answer

Anterosuperior wall

Answer

Anteroinferior wall

Answer

Posteroinferior wall

Question 5

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 6

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 7

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 8

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 9

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 10

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

Diseases of the Ear — MCQs

Diseases of the Ear — MCQs

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