Neurotology — MCQs
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Which type of abscess involves the mastoid tip?
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?
Unilateral sensorineural hearing loss may occur in which of the following conditions?
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?
Kiesselbach's plexus is the name given to which of the following vascular networks?
A patient presented with high-frequency sensorineural hearing loss and ipsilateral cerebellar ataxia. What is the likely site of the lesion?
The Eustachian tube opens into which part of the ear?
Endolymph in the inner ear:
Scheibe's syndrome is characterized by?
What is the most common perforation site in the tympanic membrane in acute suppurative otitis media?
Neurotology Indian Medical PG Practice Questions and MCQs
Question 361: Which type of abscess involves the mastoid tip?
- A. Bezold abscess (Correct Answer)
- B. Luc abscess
- C. Citelli abscess
- D. Parapharyngeal abscess
Explanation: **Explanation:** The correct answer is **Bezold abscess**. This condition occurs when pus from a mastoid air cell infection (coalescent mastoiditis) breaks through the thin inner table of the **mastoid tip**. The pus tracks down into the sheath of the **sternocleidomastoid muscle**, presenting as a painful inflammatory swelling in the upper neck. **Analysis of Options:** * **Bezold Abscess (Correct):** Specifically involves the mastoid tip. The pus is deep to the sternocleidomastoid muscle, often making the swelling feel firm rather than fluctuant. * **Luc Abscess:** This is a subperiosteal abscess where pus tracks through the **meatal wall** (external auditory canal) rather than the mastoid tip. It is often associated with chronic suppurative otitis media (CSOM). * **Citelli Abscess:** Pus tracks through the **digastric notch** (medial to the mastoid tip) and follows the posterior belly of the digastric muscle toward the occipital bone or digastric triangle. * **Parapharyngeal Abscess:** This is a deep neck space infection. While it can be a complication of ear infections (Bezold abscess tracking medially), it most commonly arises from tonsillar or dental infections. **High-Yield Clinical Pearls for NEET-PG:** * **Citelli’s Abscess:** Think "Digastric muscle/Occipital region." * **Zygomatic Abscess:** Pus tracks into the root of the zygoma, causing swelling over the cheek and lower eyelid. * **Post-auricular Abscess:** The most common complication of acute mastoiditis; it displaces the pinna **forwards and downwards**. * **Radiology:** Contrast-enhanced CT (CECT) is the gold standard for diagnosing these extracranial complications of mastoiditis.
Question 362: 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?
- A. Chronic suppurative otitis media
- B. Chronic otitis externa (Correct Answer)
- C. Keratosis obturans
- D. Carcinoma of the external auditory canal
Explanation: **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."
Question 363: Unilateral sensorineural hearing loss may occur in which of the following conditions?
- A. Coronavirus
- B. Mumps (Correct Answer)
- C. Pertussis
- D. Rotavirus
Explanation: **Explanation:** **Mumps** is the most common viral cause of **unilateral sudden sensorineural hearing loss (SNHL)** in children and young adults. The virus causes endolymphatic labyrinthitis, leading to the destruction of the hair cells in the Organ of Corti and atrophy of the stria vascularis. Characteristically, the hearing loss is sudden, profound, and permanent. While mumps parotitis is usually bilateral, the associated SNHL is typically unilateral (bilateral involvement occurs in only about 20% of cases). **Analysis of Incorrect Options:** * **Coronavirus:** While COVID-19 has been linked to rare cases of SNHL, it is not a classic or frequently tested association in the context of pediatric unilateral deafness compared to Mumps. * **Pertussis (Whooping Cough):** This is a respiratory infection caused by *Bordetella pertussis*. It does not have a direct tropism for the inner ear or the vestibulocochlear nerve. * **Rotavirus:** This is a primary cause of viral gastroenteritis. It does not involve the auditory system. **Clinical Pearls for NEET-PG:** * **Most common cause of unilateral SNHL in children:** Mumps. * **Most common cause of bilateral congenital SNHL:** Cytomegalovirus (CMV). * **Maternal Rubella:** Classically associated with "cookie-bite" hearing loss or profound SNHL. * **Measles:** Usually causes bilateral, symmetrical SNHL. * **Ramsay Hunt Syndrome (Herpes Zoster Oticus):** Presents with SNHL, vertigo, and facial nerve palsy accompanied by vesicles in the EAC.
Question 364: 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?
- A. Eustachian tube obstruction
- B. Patulous eustachian tube (Correct Answer)
- C. Otitis media with effusion
- D. Otosclerosis
Explanation: ### Explanation **1. Why Patulous Eustachian Tube is Correct:** The **Patulous Eustachian Tube (PET)** is a condition where the Eustachian tube remains abnormally open (patent) instead of staying closed at rest. * **Autophony:** Because the tube is open, the patient hears their own voice and breath sounds (echoing) as sound travels directly from the nasopharynx to the middle ear. * **Tympanic Membrane (TM) Movement:** The hallmark sign is the TM moving inward and outward **synchronously with respiration**. This is exaggerated when the patient breathes forcefully or when the contralateral nostril is closed, as all nasopharyngeal pressure changes are transmitted directly to the middle ear. * **Pregnancy Association:** High estrogen levels in the third trimester (or use of OCPs) can cause a decrease in the tissue volume/fat pad (Ostmann’s fat pad) surrounding the tube, leading to its abnormal patency. **2. Why Other Options are Incorrect:** * **Eustachian Tube Obstruction:** This leads to negative middle ear pressure and TM retraction. The TM would be immobile or retracted, not moving with respiration. * **Otitis Media with Effusion (OME):** This involves fluid behind the TM. On examination, the TM is usually dull, retracted, or immobile (Type B tympanogram). It does not cause respiratory-synchronous movements. * **Otosclerosis:** This is a bony fixation of the stapes footplate. It presents with progressive conductive hearing loss and a normal-looking, intact TM (Schwartze sign may be present). **3. Clinical Pearls for NEET-PG:** * **Classic Presentation:** A patient who feels "fullness" in the ear that **improves when leaning forward** or placing the head between the knees (this increases venous congestion and temporarily closes the tube). * **Risk Factors:** Rapid weight loss (loss of Ostmann’s fat pad), pregnancy, and radiotherapy. * **Diagnosis:** Confirmed via **long-decay tympanometry** or direct visualization of TM movement during forceful breathing. * **Management:** Reassurance, weight gain, or in severe cases, surgical narrowing of the tube orifice.
Question 365: Kiesselbach's plexus is the name given to which of the following vascular networks?
- A. Anterior nasal septum (Correct Answer)
- B. Posterior nasal septum
- C. Lateral nasal wall
- D. Inferior turbinate
Explanation: **Explanation:** **Kiesselbach’s Plexus** (also known as **Little’s Area**) is a highly vascularized region located in the **anteroinferior part of the nasal septum**. It is the most common site for epistaxis (90% of cases), particularly in children and young adults. The plexus is formed by the anastomosis of four (sometimes cited as five) major arteries: 1. **Anterior Ethmoidal Artery** (from Internal Carotid system) 2. **Sphenopalatine Artery** (from External Carotid system) 3. **Greater Palatine Artery** (from External Carotid system) 4. **Superior Labial Artery** (Septal branch from Facial artery) **Analysis of Options:** * **B. Posterior nasal septum:** This area is primarily supplied by the **Woodruff’s Plexus**, located over the posterior end of the middle turbinate/sphenopalatine foramen. It is the common site for posterior epistaxis in elderly patients. * **C. Lateral nasal wall:** While vascular, it does not house Kiesselbach’s plexus. It contains the turbinates and the opening of the paranasal sinuses. * **D. Inferior turbinate:** This is a structure on the lateral wall. While it can bleed, it is not the site of the specific anastomotic network known as Kiesselbach’s plexus. **NEET-PG High-Yield Pearls:** * **Woodruff’s Plexus:** The "posterior" equivalent of Little's area; bleeding here is harder to control and often requires posterior packing. * **Artery of Epistaxis:** The **Sphenopalatine artery** is known as the "Artery of Epistaxis." * **First-line Management:** For bleeding from Kiesselbach’s plexus, the initial step is **Trotter’s Method** (pinching the soft part of the nose and leaning forward). * **Blood Supply:** Note that the *Posterior Ethmoidal Artery* does **not** contribute to Kiesselbach’s plexus.
Question 366: A patient presented with high-frequency sensorineural hearing loss and ipsilateral cerebellar ataxia. What is the likely site of the lesion?
- A. Pons
- B. Cerebellopontine angle (Correct Answer)
- C. Medulla
- D. Thalamus
Explanation: ### Explanation The clinical presentation of **high-frequency sensorineural hearing loss (SNHL)** combined with **ipsilateral cerebellar ataxia** is a classic indicator of a lesion in the **Cerebellopontine Angle (CPA)**. **Why Option B is Correct:** The CPA is a potential space in the posterior cranial fossa. The most common lesion here is a **Vestibular Schwannoma** (Acoustic Neuroma). 1. **Hearing Loss:** As the tumor arises from the vestibular nerve, it compresses the adjacent **Cochlear nerve (CN VIII)**, typically resulting in high-frequency SNHL and tinnitus. 2. **Ataxia:** As the tumor expands posteriorly and medially, it compresses the **cerebellar peduncles** or the cerebellum itself, leading to ipsilateral ataxia, dysmetria, and intention tremors. **Why other options are incorrect:** * **A. Pons:** While the CN VIII nuclei are located at the pontomedullary junction, a primary pontine lesion (like a stroke or glioma) would typically present with "long tract signs" (hemiparesis) and CN VI (Abducens) palsy before causing significant hearing loss. * **C. Medulla:** Medullary lesions (e.g., Wallenberg Syndrome) present with vertigo, dysphagia, and Horner’s syndrome, but isolated high-frequency SNHL is not a hallmark feature. * **D. Thalamus:** The thalamus is a sensory relay station. A lesion here would cause contralateral sensory loss and would not cause peripheral-type SNHL or ipsilateral ataxia. **High-Yield Clinical Pearls for NEET-PG:** * **Order of Nerve Involvement in CPA Tumors:** CN VIII (Vestibular > Cochlear) → CN V (loss of corneal reflex is the earliest sign of trigeminal involvement) → CN VII → CN IX, X, XI. * **Gold Standard Investigation:** Gadolinium-enhanced MRI of the Brain/Internal Auditory Canal. * **Audiometry Finding:** Retrocochlear pathology (Roll-over phenomenon and poor Speech Discrimination Score). * **Bilateral Vestibular Schwannomas:** Pathognomonic for **Neurofibromatosis Type 2 (NF2)**.
Question 367: The Eustachian tube opens into which part of the ear?
- A. Inner ear
- B. Middle ear (Correct Answer)
- C. Outer ear
- D. Larynx
Explanation: **Explanation:** The **Eustachian tube (Pharyngotympanic tube)** is a fibrocartilaginous structure that connects the **nasopharynx** to the **middle ear cavity**. Its primary function is to equalize air pressure between the atmosphere and the middle ear, ensuring optimal vibration of the tympanic membrane. * **Why Option B is correct:** The Eustachian tube opens specifically into the **anterior wall** of the middle ear (tympanic cavity). It serves as the only physiological communication between the middle ear and the outside world via the nasopharynx. * **Why Option A is incorrect:** The inner ear (cochlea and vestibule) is a fluid-filled, closed system encased in the bony labyrinth of the temporal bone; it has no direct communication with the Eustachian tube. * **Why Option C is incorrect:** The outer ear is separated from the middle ear by the tympanic membrane. * **Why Option D is incorrect:** The tube opens into the lateral wall of the **nasopharynx** (at the level of the inferior turbinate), not the larynx. **High-Yield Clinical Pearls for NEET-PG:** 1. **Anatomy:** In adults, it is 36mm long, directed downwards, forwards, and medially. In **infants**, it is shorter (18mm), wider, and more **horizontal**, which explains the higher incidence of Otitis Media in children. 2. **Muscles:** The **Tensor Veli Palatini** is the primary muscle responsible for opening the tube (the "dilator tubae"). 3. **Pathology:** Eustachian tube dysfunction can lead to negative middle ear pressure, resulting in **retracted TM** or **Otitis Media with Effusion (Glue Ear)**. 4. **Landmark:** The pharyngeal opening is located near the **Fossa of Rosenmüller**, the most common site for Nasopharyngeal Carcinoma.
Question 368: Endolymph in the inner ear:
- A. Is a filtrate of blood serum
- B. Is secreted by the stria vascularis (Correct Answer)
- C. Is secreted by the basilar membrane
- D. Is secreted by hair cells
Explanation: **Explanation:** The inner ear contains two distinct fluids: **perilymph** and **endolymph**. Understanding their origin and composition is a high-yield topic for NEET-PG. **1. Why the Correct Answer is Right:** The **stria vascularis**, a highly vascularized layer of stratified epithelium located on the outer wall of the cochlear duct (scala media), is the primary site for the production of endolymph. It functions as a "metabolic engine," actively transporting ions to maintain the unique chemical composition of endolymph, which is characterized by a **high Potassium (K+)** and **low Sodium (Na+)** concentration. This creates the endocochlear potential (+80 mV) necessary for hair cell transduction. **2. Why the Other Options are Wrong:** * **Option A:** Perilymph, not endolymph, is considered a filtrate of blood serum (and is also continuous with cerebrospinal fluid via the cochlear aqueduct). * **Option C:** The **basilar membrane** is a structural partition that supports the Organ of Corti; it has no secretory function. * **Option D:** **Hair cells** are sensory receptors that are bathed in endolymph; they do not secrete it. They rely on the ionic gradient provided by the stria vascularis to function. **Clinical Pearls for NEET-PG:** * **Composition:** Endolymph resembles **intracellular fluid** (High K+), while perilymph resembles **extracellular fluid** (High Na+). * **Meniere’s Disease:** Caused by the distension of the endolymphatic space due to defective resorption (Endolymphatic Hydrops). * **Absorption:** Endolymph is drained via the endolymphatic duct and absorbed by the **endolymphatic sac**. * **Potassium Recycling:** Mutations in GJB2 (Connexin 26) affect potassium recycling between the hair cells and stria vascularis, leading to common forms of hereditary deafness.
Question 369: Scheibe's syndrome is characterized by?
- A. Middle ear anomaly
- B. Dysplasia of cochlea (Correct Answer)
- C. Semicircular canal fistula
- D. Bony labyrinth defect
Explanation: **Explanation:** **Scheibe’s Dysplasia** (also known as Cochleosaccular Dysplasia) is the most common form of congenital inner ear malformation. It is characterized by a restricted anomaly involving only the **membranous labyrinth**, specifically the **cochlea and the saccule**. 1. **Why Option B is Correct:** In Scheibe’s syndrome, the bony labyrinth is normal, but there is atrophy of the stria vascularis and degeneration of the organ of Corti. Since the cochlea is the primary site of neuroepithelial degeneration, it is classified as a dysplasia of the cochlea. 2. **Why Other Options are Incorrect:** * **Option A:** Scheibe’s is an inner ear pathology; the middle ear structures (ossicles) are typically normal. * **Option D:** Unlike Mondini dysplasia (which involves a small bony cochlea with fewer turns), Scheibe’s syndrome features a **normal bony labyrinth**. The defect is purely membranous. * **Option C:** Semicircular canal fistulas are usually acquired (e.g., via cholesteatoma) and are not part of this congenital dysplastic spectrum. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common:** Scheibe’s is the most common congenital inner ear malformation (found in ~70% of cases). * **Association:** It is frequently associated with **Waardenburg Syndrome** and Usher Syndrome. * **Radiology:** Because the defect is membranous, a **CT scan of the temporal bone will appear normal**, making it a difficult diagnosis to confirm via routine imaging. * **Mondini Dysplasia vs. Scheibe’s:** Mondini involves both bony and membranous defects (1.5 turns of cochlea), whereas Scheibe’s is strictly membranous.
Question 370: What is the most common perforation site in the tympanic membrane in acute suppurative otitis media?
- A. Antero-inferior (Correct Answer)
- B. Postero-inferior
- C. Antero-superior
- D. Postero-superior
Explanation: ### 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.
Practice by Chapter
Vestibular System Anatomy and Physiology
Practice Questions
Vestibular Testing
Practice Questions
Benign Paroxysmal Positional Vertigo
Practice Questions
Ménière's Disease
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Vestibular Neuritis
Practice Questions
Labyrinthitis
Practice Questions
Acoustic Neuroma
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Other Cerebellopontine Angle Tumors
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Facial Nerve Disorders
Practice Questions
Skull Base Surgery
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Cochlear Implantation
Practice Questions
Vestibular Schwannoma Management
Practice Questions
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