Otolaryngology Basics — MCQs

Otolaryngology Basics Indian Medical PG Practice Questions and MCQs

Question 171: In type 4 thyroplasty, what happens to the vocal cord?

A. Medially displaced
B. Laterally displaced
C. Lengthened (Correct Answer)
D. Shortened

Explanation: **Explanation:** Thyroplasty, as classified by **Isshiki**, refers to laryngeal framework surgeries designed to alter the position or tension of the vocal cords to improve voice quality. **Why Option C is Correct:** **Type 4 Thyroplasty (Cricothyroid Approximation)** is a **tension-increasing** procedure. It involves approximating the thyroid cartilage to the cricoid cartilage using sutures, mimicking the action of the cricothyroid muscle. This maneuver increases the distance between the anterior commissure and the arytenoids, thereby **lengthening** and tensing the vocal cords. It is clinically used to **raise the vocal pitch**, most commonly in cases of androphonia (high-pitched female voice) or for gender-affirming voice surgery (trans-women). **Analysis of Incorrect Options:** * **Option A (Medially displaced):** This occurs in **Type 1 Thyroplasty**, used for unilateral vocal cord palsy to improve glottic closure. * **Option B (Laterally displaced):** This occurs in **Type 2 Thyroplasty**, used to widen the glottis in conditions like adductor spasmodic dysphonia. * **Option D (Shortened):** This occurs in **Type 3 Thyroplasty (Relaxation Thyroplasty)**, where a vertical strip of cartilage is removed to reduce tension and **lower the pitch** (used in puberphonia). **High-Yield Clinical Pearls for NEET-PG:** * **Type 1:** Medialization (for Paralysis/Atrophy) – *Most common.* * **Type 2:** Lateralization (for Spasmodic Dysphonia). * **Type 3:** Relaxation/Shortening (to Lower Pitch). * **Type 4:** Stretching/Lengthening (to Raise Pitch). * **Mnemonic:** **M**edial, **L**ateral, **R**elax, **S**tretch (**M-L-R-S** for Types 1-4).

Question 172: Which of the following is NOT a derivative of the 3rd pharyngeal (branchial) arch?

A. Lesser cornu of hyoid bone (Correct Answer)
B. Greater cornu of hyoid bone
C. Stylopharyngeus muscle
D. Lower part of body of hyoid bone

Explanation: ### Explanation The pharyngeal (branchial) arches are fundamental to head and neck development. To answer this question, one must distinguish between the derivatives of the **second** and **third** arches. **1. Why "Lesser cornu of hyoid bone" is the correct answer:** The **Lesser cornu** and the **upper part of the body** of the hyoid bone are derived from the **2nd pharyngeal arch** (Reichert’s cartilage). Since the question asks for what is *NOT* a derivative of the 3rd arch, this is the correct choice. **2. Analysis of Incorrect Options (3rd Arch Derivatives):** * **Greater cornu of hyoid bone (B) & Lower part of body of hyoid bone (D):** The 3rd arch cartilage ossifies to form the lower portion of the hyoid apparatus. * **Stylopharyngeus muscle (C):** This is the **only** muscle derived from the 3rd pharyngeal arch. It is uniquely supplied by the **Glossopharyngeal nerve (CN IX)**, which is the nerve of the 3rd arch. **3. NEET-PG High-Yield Pearls:** * **Nerve Supply Rule:** Each arch has a specific cranial nerve. 1st Arch = CN V3; 2nd Arch = CN VII; **3rd Arch = CN IX**; 4th Arch = Superior Laryngeal Nerve (CN X); 6th Arch = Recurrent Laryngeal Nerve (CN X). * **Hyoid Bone Split:** Remember the "Upper/Lower" rule. The 2nd arch forms the top half (Lesser cornu + Upper body); the 3rd arch forms the bottom half (Greater cornu + Lower body). * **Pouch vs. Arch:** Do not confuse arches (mesoderm/neural crest) with pouches (endoderm). The 3rd **pouch** gives rise to the Inferior Parathyroid glands and the Thymus.

Question 173: Which of the following is not an ototoxic drug?

A. Paracetamol (Correct Answer)
B. Cisplatin
C. Quinine
D. Erythromycin

Explanation: **Explanation:** **1. Why Paracetamol is the Correct Answer:** Paracetamol (Acetaminophen) is a non-opioid analgesic and antipyretic that is generally considered safe for the auditory system. Unlike Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) like Aspirin, which can cause reversible tinnitus and hearing loss at high doses, Paracetamol does not possess significant ototoxic properties and does not damage the cochlear hair cells or the stria vascularis. **2. Analysis of Incorrect Options (Ototoxic Drugs):** * **Cisplatin:** A potent chemotherapeutic agent known for causing **permanent, bilateral, high-frequency sensorineural hearing loss (SNHL)**. It causes damage by generating free radicals that destroy the outer hair cells of the Organ of Corti. * **Quinine:** Used in the treatment of malaria and nocturnal muscle cramps. It causes "Cinchonism," characterized by reversible SNHL and tinnitus. It primarily affects the enzyme systems within the cochlea. * **Erythromycin:** While most macrolides are safe, intravenous high-dose Erythromycin (especially in patients with renal or hepatic failure) can cause **reversible SNHL**. **3. High-Yield Clinical Pearls for NEET-PG:** * **Aminoglycosides:** The most common cause of drug-induced ototoxicity. **Gentamicin/Streptomycin** are primarily vestibulotoxic, while **Amikacin/Neomycin/Kanamycin** are primarily cochleotoxic. * **Loop Diuretics:** (e.g., Furosemide, Ethacrynic acid) cause edema of the stria vascularis, leading to usually reversible hearing loss. * **Salicylates (Aspirin):** Characteristically cause high-pitched tinnitus and reversible SNHL. * **Topical Ototoxicity:** Avoid using aminoglycoside ear drops in the presence of a tympanic membrane perforation to prevent damage to the inner ear via the round window.

Question 174: A palpatory thud, an audible snap, is observed in which of the following conditions?

A. Tracheal foreign body (Correct Answer)
B. Bronchial foreign body
C. Laryngeal foreign body
D. Foreign body in the ear

Explanation: **Explanation:** The classic triad of **Audible Slap, Palpatory Thud, and Asthmatoid Wheeze** is pathognomonic for a **Tracheal Foreign Body**. 1. **Why Tracheal Foreign Body is correct:** * **Audible Slap:** When the patient coughs or breathes forcefully, the foreign body is propelled upward and strikes the undersurface of the vocal cords. This produces a distinct slapping sound heard at the mouth. * **Palpatory Thud:** This is the tactile equivalent of the slap. If the examiner places a finger on the trachea (cricothyroid membrane) during coughing, they can feel the impact of the foreign body hitting the subglottis. * **Asthmatoid Wheeze:** Produced by air bypassing the obstruction in the trachea; it is heard best at the mouth with the patient's mouth open. 2. **Why other options are incorrect:** * **Bronchial Foreign Body:** These typically present with unilateral decreased breath sounds, localized wheezing, or obstructive emphysema/atelectasis. Since the object is lodged deeper in a smaller airway, it cannot move freely enough to strike the vocal cords. * **Laryngeal Foreign Body:** These present with acute respiratory distress, hoarseness, or aphonia. The object is usually wedged firmly, preventing the "bouncing" motion required for a thud or slap. * **Foreign Body in the Ear:** Presents with earache, deafness, or irritation; it has no correlation with respiratory sounds or tracheal palpation. **Clinical Pearls for NEET-PG:** * **Most common site** for inhaled foreign bodies: **Right main bronchus** (due to it being wider, shorter, and more vertical). * **Vegetable foreign bodies** (e.g., peanuts) are most dangerous as they cause **vegetal bronchitis** due to the release of fatty acids. * **Gold Standard Investigation:** Rigid Bronchoscopy (both diagnostic and therapeutic).

Question 175: A 10-year-old boy developed hoarseness of voice following an attack of diphtheria. On examination, his right vocal cord was paralysed. What is the initial recommended management for a paralysed vocal cord in this scenario?

A. Injection of gel foam into the right vocal cord
B. Fat injection into the right vocal cord
C. Thyroplasty type I
D. Observation for spontaneous recovery of the vocal cord (Correct Answer)

Explanation: ### Explanation **1. Why "Observation for spontaneous recovery" is correct:** In the context of post-diphtheritic paralysis, the underlying cause is **diphtheritic neuropathy** (caused by the *Corynebacterium diphtheriae* exotoxin). This typically manifests as a lower motor neuron lesion. Most cases of post-infectious or idiopathic vocal cord paralysis (VCP) have a high rate of **spontaneous recovery** within 6 to 12 months as the nerve regenerates or the toxin effect wears off. Therefore, the standard initial management is "watchful waiting" or observation to allow for natural healing before considering permanent surgical interventions. **2. Why the other options are incorrect:** * **Options A & B (Gelfoam/Fat Injection):** These are forms of **Injection Laryngoplasty** (Medialization). While Gelfoam is temporary, surgical intervention is generally deferred in the acute phase unless the patient suffers from severe aspiration or significant glottic insufficiency that compromises the airway or nutrition. * **Option C (Thyroplasty Type I):** This is a **permanent** surgical procedure (Isshiki Type I) used to medialize the vocal cord. It is contraindicated in the initial phase of paralysis because it is irreversible and the nerve function may still return. Permanent medialization is usually only considered if there is no recovery after 12 months. **3. Clinical Pearls for NEET-PG:** * **Diphtheria & ENT:** The most common neurological complication of diphtheria is **palatal paralysis** (occurring in the 3rd week), followed by ocular and then laryngeal/respiratory paralysis (5th–10th week). * **Wait Period:** The standard observation period for unilateral vocal cord paralysis before permanent surgery is **6 to 12 months**. * **Thyroplasty Types:** * **Type I:** Medialization (for Unilateral VCP). * **Type II:** Lateralization (for Spasmodic Dysphonia). * **Type III:** Relaxation/Shortening (to lower pitch). * **Type IV:** Stretching/Tension (to raise pitch).

Question 176: What is the earliest sign of tuberculosis of the vocal cords?

A. Mouse nibbled appearance
B. Hyperemia of the free margin (Correct Answer)
C. Turban epiglotitis
D. Ulceration of vocal cord

Explanation: ### Explanation Laryngeal tuberculosis is almost always secondary to pulmonary tuberculosis, occurring due to the expectoration of infected sputum. **1. Why "Hyperemia of the free margin" is correct:** The earliest pathological change in laryngeal TB is congestion. Specifically, **hyperemia (redness) of the free margins of the vocal cords** is the first clinical sign visible on laryngoscopy. This represents the initial inflammatory response before structural destruction or granulation tissue forms. **2. Analysis of Incorrect Options:** * **A. Mouse nibbled appearance:** This is a classic description of laryngeal TB, but it is a **later stage**. It occurs when multiple small ulcers coalesce along the edge of the vocal cords, giving them a jagged, "eaten-away" look. * **C. Turban epiglottis:** This refers to the marked edema and thickening of the epiglottis, making it look like a turban. This is a characteristic feature of **advanced** laryngeal TB, not the earliest sign. * **D. Ulceration of vocal cord:** Ulceration follows the initial hyperemic stage. These ulcers are typically shallow, pale, and exquisitely painful. **3. Clinical Pearls for NEET-PG:** * **Most common site:** Traditionally the **posterior commissure** (interarytenoid area), though recent trends show increasing involvement of the anterior larynx. * **Cardinal Symptom:** **Odynophagia** (painful swallowing) is often disproportionately severe compared to the physical findings. * **Hoarseness:** The most common presenting complaint. * **Diagnosis:** Gold standard is a biopsy (to rule out malignancy) and sputum for AFB/CBNAAT. * **Treatment:** Standard Anti-Tubercular Therapy (ATT). The laryngeal lesions usually heal rapidly once systemic treatment begins.

Question 177: Moure's sign can be detected in which of the following conditions?

A. Nasopharyngeal carcinoma
B. Oropharyngeal carcinoma
C. Postcricoid carcinoma (Correct Answer)
D. Supraglottic carcinoma

Explanation: **Explanation:** **Moure’s Sign** (also known as the loss of laryngeal crepitus) is a classic clinical sign used to identify malignancies of the postcricoid region. **Why Postcricoid Carcinoma is Correct:** Normally, when the larynx is moved side-to-side against the vertebral column, a palpable "grating" sensation or click is produced; this is known as **laryngeal crepitus**. In **Postcricoid Carcinoma**, the tumor mass infiltrates the space between the cricoid cartilage and the cervical vertebrae. This soft tissue mass acts as a "cushion," preventing the cartilage from rubbing against the bone, thereby leading to the **loss of laryngeal crepitus (Positive Moure’s Sign)**. **Why Other Options are Incorrect:** * **Nasopharyngeal Carcinoma:** This occurs in the upper pharynx, far above the larynx, and does not interfere with laryngeal mobility against the vertebrae. * **Oropharyngeal Carcinoma:** While closer to the larynx, these tumors typically involve the base of tongue or tonsils and do not occupy the postcricoid space required to abolish crepitus. * **Supraglottic Carcinoma:** These tumors involve the structures above the vocal cords (e.g., epiglottis). Unless there is massive posterior extension into the hypopharynx, laryngeal crepitus remains preserved. **Clinical Pearls for NEET-PG:** * **Postcricoid Carcinoma** is highly associated with **Plummer-Vinson (Paterson-Brown-Kelly) Syndrome**, characterized by iron deficiency anemia, glossitis, and esophageal webs. * It is more common in **females**, unlike most other head and neck cancers. * **Trotter’s Triad** (for Nasopharyngeal Ca): Conductive deafness, palatal paralysis, and trigeminal neuralgia. * **Direct Laryngoscopy** is the gold standard for evaluating the extent of postcricoid lesions.

Question 178: Which cyst is considered the most aggressive and destructive?

A. Periapical cyst
B. Dentigerous cyst (Correct Answer)
C. Globulomaxillary cyst
D. Nasopalatine cyst

Explanation: **Explanation:** The **Dentigerous cyst** (also known as a follicular cyst) is the correct answer because it is the most common type of non-inflammatory odontogenic cyst and is known for its potential to reach a large size, causing significant bone expansion and destruction. It originates from the separation of the follicle from around the crown of an **unerupted tooth** (most commonly the mandibular third molar). Its aggressiveness stems from its ability to resorb the roots of adjacent teeth and its potential for neoplastic transformation into an ameloblastoma or squamous cell carcinoma. **Analysis of Incorrect Options:** * **Periapical (Radicular) Cyst:** The most common odontogenic cyst, but it is inflammatory in nature (associated with a non-vital tooth). While it causes bone resorption, it is generally less aggressive and smaller than a dentigerous cyst. * **Globulomaxillary Cyst:** Historically described as a "fissural" cyst between the maxillary lateral incisor and canine. It is now considered a clinical term for various cysts (like OKC or lateral periodontal cysts) rather than a distinct aggressive entity. * **Nasopalatine Duct Cyst:** The most common non-odontogenic cyst of the maxilla. It is usually slow-growing and asymptomatic, located in the midline of the anterior palate, and lacks the destructive potential of a dentigerous cyst. **NEET-PG High-Yield Pearls:** * **Radiological Hallmark:** A well-defined unilocular radiolucency attached to the **neck** of an unerupted tooth (Cemento-enamel junction). * **Most Common Site:** Mandibular 3rd molars > Maxillary canines. * **Differential Diagnosis:** Always consider **Odontogenic Keratocyst (OKC)** if the lesion is highly aggressive; however, among the options provided, the Dentigerous cyst is the most destructive. * **Treatment:** Enucleation and extraction of the involved tooth.

Question 179: Pseudosulcus in the larynx is most commonly associated with which of the following conditions?

A. Laryngopharyngeal reflux (Correct Answer)
B. Vocal abuse
C. Chronic steroid use
D. Tuberculosis

Explanation: **Explanation:** **Pseudosulcus vocalis** is a characteristic clinical finding in **Laryngopharyngeal Reflux (LPR)**. It refers to a linear groove or furrow extending along the entire length of the vocal fold, from the anterior commissure to the posterior glottis. 1. **Why LPR is correct:** In LPR, the chronic irritation of the laryngeal mucosa by gastric acid and pepsin leads to subglottic edema. This swelling occurs specifically in the subglottic region, creating a distinct "shelf-like" appearance or a false groove below the true vocal fold. This is termed "pseudo" because, unlike true *Sulcus Vocalis* (which is a mucosal invagination into the Reinke’s space), pseudosulcus is simply an optical illusion created by infra-glottic edema. 2. **Why other options are incorrect:** * **Vocal abuse:** Typically leads to localized lesions like vocal nodules (at the junction of the anterior 1/3 and posterior 2/3) or vocal polyps, rather than a diffuse subglottic groove. * **Chronic steroid use:** Inhaled steroids are more commonly associated with laryngeal candidiasis or vocal fold atrophy/weakness, not subglottic edema. * **Tuberculosis:** Laryngeal TB usually presents with "mouse-nibbled" ulcers, posterior glottic involvement, or exuberant granulation tissue. **High-Yield Clinical Pearls for NEET-PG:** * **Belafsky’s Reflux Finding Score (RFS):** Pseudosulcus is one of the key parameters used to diagnose LPR on laryngoscopy. * **Other LPR findings:** Interarytenoid pachyderma (cobblestoning), posterior commissure hypertrophy, and diffuse laryngeal erythema. * **True Sulcus Vocalis:** Often congenital or due to trauma; it involves a defect in the lamina propria and is much harder to treat than pseudosulcus.

Question 180: A laryngeal mirror is warmed before use by placing:

A. The glass surface on a flame (Correct Answer)
B. The back of the mirror on a flame
C. The whole mirror into a flame
D. The mirror in boiling water

Explanation: **Explanation:** The primary objective of warming a laryngeal mirror before an Indirect Laryngoscopy (IDL) is to **prevent fogging**. When a cold mirror is introduced into the oropharynx, the warm, moist expired air from the patient condenses on the glass surface, obstructing the clinician's view. **Why Option A is Correct:** The **glass surface** (reflective side) is placed directly over the spirit lamp flame for a few seconds. This ensures that the surface where condensation occurs is sufficiently heated. By warming the glass above body temperature, the dew point is not reached, and the mirror remains clear during the procedure. **Why Other Options are Incorrect:** * **Option B:** Heating only the back of the mirror is inefficient. The metal backing acts as a heat sink, and it takes longer for the glass surface to reach the required temperature, potentially leading to inadequate defogging. * **Option C:** Placing the whole mirror in the flame can overheat the metal handle and frame, increasing the risk of accidental burns to the patient’s lips or soft palate. * **Option D:** Boiling water is impractical in a standard OPD setting and makes the mirror wet. Moisture on the mirror distorts the reflection (refraction errors), requiring the clinician to dry it anyway, which wastes time. **Clinical Pearls for NEET-PG:** 1. **Temperature Check:** Always test the temperature of the mirror on the **back of your hand** before introducing it into the patient's mouth to prevent thermal injury. 2. **Alternative Methods:** In modern practice, "Savlon" (antiseptic solution) or commercial anti-fogging sprays are often used to coat the mirror as an alternative to heating. 3. **Mirror Angle:** During IDL, the mirror is held at an angle of **45 degrees** against the soft palate/uvula. 4. **Structures Seen:** IDL provides a "reversed" image (anterior appears posterior) but not an inverted one.

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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