Otolaryngology Basics — MCQs

Otolaryngology Basics Indian Medical PG Practice Questions and MCQs

Question 181: A 3-year-old male child presents with multiple laryngeal papillomas, hoarse voice, and slight airway distress. The papillomas involve the glottis. What is the best treatment?

A. Tracheostomy and observation
B. Steroids
C. Interferon therapy
D. Microlaryngoscopy and excision (Correct Answer)

Explanation: **Explanation:** The clinical presentation is classic for **Juvenile Onset Recurrent Respiratory Papillomatosis (JORRP)**, most commonly caused by **HPV types 6 and 11**. **Why Microlaryngoscopy and Excision is correct:** The primary goal of management in JORRP is to maintain a patent airway and improve voice quality while minimizing damage to the underlying vocal fold tissues. **Microlaryngoscopic surgery** (using CO2 laser or microdebrider) is the **gold standard treatment**. It allows for precise removal of the papillomatous lesions. It is important to note that surgery is palliative, not curative, as the virus remains latent in the surrounding mucosa, often requiring multiple procedures. **Why other options are incorrect:** * **Tracheostomy:** This is avoided as much as possible because it can lead to **stomal seeding**, where the papillomas spread further down into the trachea and bronchi, significantly worsening the prognosis. * **Steroids:** These have no role in treating the viral etiology of papillomas and do not provide definitive airway clearance. * **Interferon therapy:** This is an adjuvant therapy used only in aggressive, refractory cases (more than 12 surgeries/year or rapid regrowth). It is not the first-line treatment. **High-Yield Clinical Pearls for NEET-PG:** * **Etiology:** HPV 6 and 11 (acquired during birth via the maternal birth canal). * **Most common site:** True vocal cords (Glottis). * **Triad of JORRP:** Hoarseness, stridor, and respiratory distress. * **Adjuvant therapies:** Cidofovir (intralesional), Bevacizumab (Avastin), and Indole-3-carbinol. * **Prevention:** Quadrivalent/Nonavalent HPV vaccine.

Question 182: A Montgomery tube is used in which ENT procedure?

A. Double barrel tube
B. Lobster tail tube
C. Airway tube
D. Silicone tube (Correct Answer)

Explanation: **Explanation:** The **Montgomery T-tube** is a specialized silicone stent used primarily in the management of tracheal stenosis and during tracheal reconstructive surgeries. **1. Why Silicone tube is correct:** The Montgomery tube is manufactured from **medical-grade silicone**. Silicone is the material of choice because it is inert, non-irritating to the respiratory mucosa, and has a smooth surface that resists the crusting of secretions. Its primary function is to act as both a tracheal stent (to maintain the airway patency) and a tracheostomy tube. It consists of a long vertical limb (placed in the trachea) and a short horizontal limb (protruding through the tracheostoma). **2. Analysis of Incorrect Options:** * **Double barrel tube:** This term usually refers to a specific type of tracheostomy tube with an inner and outer cannula or specialized double-lumen endobronchial tubes (like the Carlens tube) used in thoracic surgery, not the Montgomery tube. * **Lobster tail tube:** This is a descriptive name for the **Holinger tracheostomy tube**, which has a series of interlocking rings allowing for flexibility. It is used in patients with an altered tracheal axis or compression. * **Airway tube:** While the Montgomery tube maintains an airway, "Airway tube" is a generic functional description rather than the specific material or structural classification requested by the question. **Clinical Pearls for NEET-PG:** * **Indications:** Subglottic stenosis, tracheal reconstruction, and as a palliative stent for tracheomalacia or extrinsic compression. * **Key Feature:** Unlike a standard tracheostomy tube, the Montgomery tube does not require a flange or tapes to stay in place; the vertical limbs hold it securely within the trachea. * **Management:** The external limb is often plugged to allow the patient to breathe through the natural upper airway and phonate.

Question 183: Facial nerve palsy can be caused by which of the following conditions?

A. Cholesteatoma
B. Multiple sclerosis
C. Mastoidectomy
D. All of the above (Correct Answer)

Explanation: **Explanation:** Facial nerve palsy (Lower Motor Neuron type) is a common clinical presentation in ENT, resulting from damage to the CN VII anywhere along its long intracranial, intratemporal, or extracranial course. **Why "All of the above" is correct:** * **Cholesteatoma (Option A):** This is a common **pathological** cause. Cholesteatoma produces osteolytic enzymes (like collagenase) that erode the bony fallopian canal, most commonly at the **horizontal (tympanic) segment**. This leads to direct compression or inflammatory neuritis of the facial nerve. * **Multiple Sclerosis (Option B):** This is a **neurological** cause. MS is a demyelinating disease of the Central Nervous System. While it typically causes Upper Motor Neuron signs, it can involve the facial nerve nucleus or the internal capsule, leading to facial weakness. It is a classic differential for recurrent or bilateral facial palsy. * **Mastoidectomy (Option C):** This is an **iatrogenic (surgical)** cause. During mastoid surgery, the nerve is at risk, particularly during the removal of disease from the aditus ad antrum or while drilling near the vertical segment. It is one of the most feared complications of ear surgery. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of injury in longitudinal temporal bone fractures:** Geniculate ganglion. * **Most common site of iatrogenic injury during mastoidectomy:** Second bend (pyramidal bend) or the horizontal segment. * **Bell’s Palsy:** The most common cause of sudden-onset unilateral facial palsy (diagnosis of exclusion). * **Gradenigo’s Syndrome:** Characterized by the triad of Otorrhoea, Abducens (VI) nerve palsy, and retro-orbital pain (Trigeminal nerve involvement).

Question 184: All of the following are true about pachydermia laryngitis except?

A. Hoarseness of voice
B. Premalignant condition (Correct Answer)
C. Involves posterior part of larynx
D. Biopsy shows acanthosis and hyperkeratosis

Explanation: **Pachydermia Laryngitis** is a specific form of chronic hypertrophic laryngitis characterized by the thickening of the epithelium in the posterior part of the larynx. ### **Explanation of Options** * **Why Option B is Correct (The False Statement):** Pachydermia laryngitis is **not a premalignant condition**. Unlike leukoplakia or erythroplakia of the larynx, which carry a risk of malignant transformation into squamous cell carcinoma, pachydermia is a benign reactive process. It is typically caused by chronic irritation from gastroesophageal reflux (GERD), smoking, or alcohol. * **Option A (Hoarseness):** This is the most common presenting symptom. The structural changes and thickening of the mucosa interfere with normal vocal cord vibration and glottic closure. * **Option C (Posterior Larynx):** This is a hallmark feature. The condition characteristically involves the **interarytenoid space** and the posterior third of the vocal cords (vocal processes). This area is most susceptible to irritation from gastric acid reflux. * **Option D (Histopathology):** Biopsy typically reveals **acanthosis** (thickening of the stratum spinosum) and **hyperkeratosis** (thickening of the stratum corneum). There is no cellular atypia or dysplasia, which reinforces its benign nature. ### **High-Yield Clinical Pearls for NEET-PG** * **Appearance:** On laryngoscopy, it often presents as a "heaped up" grayish-white or reddish mass in the interarytenoid area, sometimes showing a **"cup and saucer"** appearance (a contact ulcer on one side with a granuloma on the other). * **Treatment:** Management is conservative, focusing on voice rest and aggressive treatment of the underlying cause (e.g., Proton Pump Inhibitors for GERD and cessation of smoking). * **Differential Diagnosis:** Must be differentiated from **Laryngeal Tuberculosis**, which also involves the posterior larynx but presents with "mouse-nibbled" ulcers and systemic symptoms.

Question 185: Which of the following muscles is the tensor of the vocal cord?

A. Cricothyroid (Correct Answer)
B. Interarytenoid
C. Posterior cricoarytenoid
D. Lateral cricoarytenoid

Explanation: The intrinsic muscles of the larynx are categorized based on their action on the vocal cords (folds). Understanding their specific roles is a high-yield topic for NEET-PG. ### **Correct Answer: A. Cricothyroid** The **Cricothyroid** muscle is the primary **tensor** of the vocal cords. It acts by tilting the thyroid cartilage forward or elevating the cricoid cartilage, thereby increasing the distance between the thyroid and arytenoid cartilages. This elongation and tightening of the vocal folds increase the pitch of the voice. * **Nerve Supply:** It is the only intrinsic laryngeal muscle supplied by the **External Laryngeal Nerve** (a branch of the Superior Laryngeal Nerve). ### **Analysis of Incorrect Options:** * **B. Interarytenoid:** This muscle acts as an **adductor** of the vocal cords by pulling the two arytenoid cartilages together, closing the posterior part of the glottis (rima glottidis). * **C. Posterior cricoarytenoid:** This is the **only abductor** of the vocal cords (the "safety muscle of the larynx"). It opens the glottis for breathing. * **D. Lateral cricoarytenoid:** This is a major **adductor** of the vocal cords, acting to close the glottis for phonation. ### **High-Yield Clinical Pearls for NEET-PG:** 1. **Safety Muscle:** Posterior Cricoarytenoid (abductor). 2. **Nerve Supply Rule:** All intrinsic muscles are supplied by the **Recurrent Laryngeal Nerve (RLN)**, *except* the Cricothyroid (External Laryngeal Nerve). 3. **Vocalis Muscle:** A part of the thyroarytenoid, it is responsible for **fine-tuning** tension (relaxing the cords while maintaining tension of the edge). 4. **Injury:** Damage to the External Laryngeal Nerve (often during thyroid surgery) results in the inability to produce high-pitched sounds and easy vocal fatigue.

Question 186: In conductive deafness of the right ear, in which direction will Weber's test lateralize?

A. Lateralized to the right side (Correct Answer)
B. Lateralized to the left side
C. Normal
D. Centralized

Explanation: **Explanation:** Weber’s test is a tuning fork test (using 512 Hz) used to compare bone conduction between the two ears. It is performed by placing the vibrating fork on the midline of the skull (vertex or forehead). **Why Option A is correct:** In **conductive hearing loss (CHL)**, the sound lateralizes to the **affected (poorer) ear**. In this case, since the right ear has conductive deafness, the sound will lateralize to the right. This occurs because the "masking effect" of ambient room noise is absent in the diseased ear (due to the conduction block), making the cochlea more sensitive to the bone-conducted sound. Additionally, there is a compensatory up-regulation of the cochlear sensitivity in the affected ear. **Why other options are incorrect:** * **Option B:** Lateralization to the left (the better ear) would occur if the right ear had **Sensorineural Hearing Loss (SNHL)**. * **Options C & D:** These are synonymous. A "centralized" or "normal" Weber occurs when hearing is equal in both ears (either both are normal or both have symmetrical hearing loss). **High-Yield Clinical Pearls for NEET-PG:** * **The Golden Rule:** Weber lateralizes to the **worse** ear in CHL and to the **better** ear in SNHL. * **Rinne Test Correlation:** In this patient, the right ear would likely show a **Negative Rinne** (BC > AC), confirming conductive pathology. * **False Negative Rinne:** Occurs in severe unilateral SNHL; the patient appears to hear the bone conduction in the deaf ear, but is actually perceiving it in the opposite normal ear (cross-hearing). Weber's test is crucial here to differentiate this from true CHL.

Question 187: Typical clinical features of Horner's syndrome include all except?

A. Dilated pupil (Correct Answer)
B. Ptosis
C. Enophthalmos
D. Nasal stuffiness

Explanation: **Explanation:** Horner’s syndrome results from a **disruption of the sympathetic nerve supply** to the eye and face. Under normal physiological conditions, the sympathetic system is responsible for pupillary dilation (via the dilator pupillae muscle). **Why "Dilated Pupil" is the correct answer:** In Horner’s syndrome, the loss of sympathetic innervation leads to unopposed parasympathetic action. This results in **Miosis (a constricted pupil)**, not a dilated pupil. Therefore, a dilated pupil is the "except" in this clinical presentation. **Analysis of other options:** * **Ptosis:** Caused by paralysis of the **Müller’s muscle** (superior tarsal muscle), which is sympathetically innervated. This is typically a "partial ptosis." * **Enophthalmos:** The appearance of a sunken eyeball occurs due to the narrowing of the palpebral fissure (pseudo-enophthalmos). * **Nasal Stuffiness:** Sympathetic nerves cause vasoconstriction of the nasal mucosa. Loss of this tone leads to **vasodilation and vascular engorgement** of the nasal lining, resulting in stuffiness. **High-Yield Clinical Pearls for NEET-PG:** * **The Classic Triad:** Miosis, Partial Ptosis, and Anhidrosis (loss of sweating). * **Heterochromia Iridum:** If Horner’s is congenital, the affected eye may have a different iris color (lighter) due to the role of sympathetics in melanin deposition. * **Causative Pathology:** Often associated with **Pancoast tumors** (superior sulcus tumor of the lung) involving the stellate ganglion. * **Pharmacological Test:** Cocaine drops fail to dilate a Horner’s pupil, confirming the diagnosis.

Question 188: All of the following are true about vocal cord nodules except:

A. Caused by phonotrauma
B. Commonly occur at the junction of the anterior and middle thirds of the vocal cord (Correct Answer)
C. Common at the junction of the anterior and posterior two-thirds of the vocal cord
D. Common in singers and teachers

Explanation: **Explanation:** Vocal cord nodules (Singer’s or Teacher’s nodules) are benign, bilateral, symmetrical inflammatory lesions caused by chronic mechanical stress or **phonotrauma** [1], [2]. **Why Option B is the Correct Answer (The "Except" statement):** The anatomical site of maximum vibration and impact on the vocal folds is the **junction of the anterior one-third and posterior two-thirds** of the membranous vocal cord [1]. This is where nodules typically form. Option B incorrectly states they occur at the junction of the anterior and middle thirds, making it the false statement among the choices. **Analysis of Other Options:** * **Option A:** True. Phonotrauma (vocal abuse or misuse) leads to submucosal edema and fibrosis, which are the primary pathological drivers [2]. * **Option C:** True. This is the classic anatomical location for nodules, as it represents the point of maximum strike during phonation [1]. * **Option D:** True. These are "professional voice users" who are at the highest risk due to prolonged and forceful use of the larynx [2]. **NEET-PG High-Yield Pearls:** * **Appearance:** Early nodules are soft and reddish; chronic nodules are firm, white, and fibrotic. * **Laterality:** Almost always **bilateral** and symmetrical (unlike polyps, which are often unilateral). * **Treatment:** The primary treatment is **Voice Therapy** (speech therapy) [1]. Surgery (Microlaryngeal surgery) is reserved only for large, fibrotic nodules that fail conservative management [1]. * **Demographics:** Most common in male children and adult females [2].

Question 189: Use of an otoscope during examination of the ear provides all of the following functions EXCEPT:

A. Magnification
B. Suctioning of middle ear secretions
C. Assessing tympanic membrane movement
D. Removal of foreign bodies (Correct Answer)

Explanation: The otoscope is a fundamental diagnostic tool in ENT. The correct answer is **D (Removal of foreign bodies)** because an otoscope is primarily a diagnostic instrument, not a therapeutic one. While it provides visualization, the narrow speculum and the fixed lens make it physically impossible to pass instruments (like forceps or hooks) through it to remove a foreign body while maintaining a clear view. For foreign body removal, an ear speculum and a microscope or endoscope are preferred. **Explanation of Options:** * **A. Magnification:** A standard otoscope contains a built-in convex lens that typically provides **3x magnification**, allowing for a detailed view of the external auditory canal and tympanic membrane. * **B. Suctioning of middle ear secretions:** While a standard otoscope doesn't suction, a **Siegle’s pneumatic otoscope** (a specialized version) has a side port. While its primary use is testing mobility, it can be used to visualize the ear while a separate suction tip is used, or in some contexts, the magnification helps guide micro-suctioning. * **C. Assessing tympanic membrane movement:** By attaching a rubber bulb to the side port of a pneumatic otoscope, the clinician can change the air pressure in the canal. This is the gold standard for assessing TM mobility (e.g., restricted in Serous Otitis Media). **High-Yield Clinical Pearls for NEET-PG:** * **Siegle’s Otoscope:** Provides 2.5x magnification and is used for the **Fistula Test** (positive in labyrinthine fistula). * **Light Source:** Modern otoscopes use halogen or LED bulbs for "cold light" to prevent thermal injury. * **Positioning:** To straighten the canal for otoscopy, pull the pinna **upwards, backwards, and laterally** in adults, and **downwards and backwards** in infants.

Question 190: What is the drug of choice for the treatment of epiglottitis?

A. Ceftriaxone (Correct Answer)
B. Sulphamethoxazole
C. Chloramphenicol
D. Clindamycin

Explanation: **Explanation:** Acute Epiglottitis is a life-threatening medical emergency characterized by rapid inflammation of the epiglottis. While the incidence has decreased due to the Hib vaccine, the most common causative organism remains *Haemophilus influenzae* type b (Hib), followed by *Streptococcus pneumoniae* and *Staphylococcus aureus*. **Why Ceftriaxone is the Correct Choice:** Third-generation cephalosporins, specifically **Ceftriaxone**, are the drug of choice because they provide excellent coverage against beta-lactamase-producing strains of *H. influenzae* and most Gram-positive cocci. They have superior tissue penetration and a proven safety profile in pediatric populations, who are most commonly affected. **Analysis of Incorrect Options:** * **Sulphamethoxazole:** Primarily used for UTIs or PCP pneumonia; it lacks the necessary efficacy against the aggressive pathogens causing epiglottitis. * **Chloramphenicol:** Historically used for Hib infections, it is no longer the first line due to its narrow therapeutic index and the risk of severe side effects like aplastic anemia and Gray baby syndrome. * **Clindamycin:** While useful for anaerobic infections or MRSA, it does not provide adequate coverage for *H. influenzae*, the primary pathogen in epiglottitis. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Presentation:** High fever, "Hot potato" voice, drooling, and the **Tripod position** (leaning forward to open the airway). * **X-ray Finding:** Lateral neck X-ray shows the **"Thumb sign"** (swollen epiglottis). * **Management Priority:** The first priority is **airway management** (intubation or tracheostomy). Do not examine the throat with a tongue depressor, as it may trigger fatal laryngospasm. * **Prophylaxis:** Rifampicin is given to close contacts of Hib-positive cases.

Practice by Chapter

Embryology of the Ear, Nose, and Throat

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Anatomy of the Ear

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Anatomy of the Nose and Paranasal Sinuses

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Anatomy of the Oral Cavity and Pharynx

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Anatomy of the Larynx

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Physiology of Hearing

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Physiology of Balance

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Physiology of Smell and Taste

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Physiology of Speech and Swallowing

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Clinical Examination in ENT

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Diagnostic Investigations in ENT

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Surgical Principles in Otolaryngology

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