Otolaryngology Basics — MCQs

Otolaryngology Basics Indian Medical PG Practice Questions and MCQs

Question 61: What is true regarding functional aphonia?

A. Higher incidence in males
B. Due to vocal cord paralysis
C. On laryngoscopy, vocal cords are abducted (Correct Answer)
D. Speech therapy is the treatment of choice

Explanation: **Functional Aphonia** (also known as Hysterical Aphonia) is a conversion disorder where a patient loses their voice despite having a normal laryngeal mechanism. It is most commonly seen in young females undergoing emotional stress. ### **Explanation of Options** * **Correct Answer (C):** On laryngoscopy, the vocal cords appear normal in structure and mobility. However, when the patient attempts to speak, the **vocal cords remain abducted** (open) and fail to meet in the midline. Interestingly, during "reflexive" actions like **coughing or throat clearing**, the vocal cords adduct perfectly, producing a sharp sound. This discrepancy is the hallmark of the diagnosis. * **Option A:** This is incorrect because functional aphonia has a significantly **higher incidence in females** than males. * **Option B:** There is **no organic paralysis**. The nerve supply (Recurrent Laryngeal Nerve) and the muscles are intact; the condition is purely psychological. * **Option D:** While speech therapy is used, the **treatment of choice is Psychological Counseling** and reassurance. Often, "persuasion" or "suggestion" therapy (convincing the patient they can speak) results in a dramatic recovery. ### **High-Yield Clinical Pearls for NEET-PG** * **The "Cough" Test:** A patient with functional aphonia can produce a loud, forceful cough (proving adductor function), whereas a patient with true vocal cord paralysis cannot. * **Voice Quality:** The patient usually speaks in a whisper. * **Laryngeal Appearance:** The cords often form a "V" shape on phonation (posterior gap) or remain completely abducted. * **Differential Diagnosis:** Must be distinguished from *Adductor Spasmodic Dysphonia*, where the cords adduct too tightly (strained-strangled voice).

Question 62: All of the following are true about the larynx in a neonate, except?

A. The epiglottis is large and omega shaped.
B. The tongue is small in comparison to the oral cavity. (Correct Answer)
C. The cricoid cartilage is the narrowest part.
D. It is funnel shaped.

Explanation: ### Explanation The pediatric airway is not merely a smaller version of the adult airway; it possesses distinct anatomical characteristics that are high-yield for NEET-PG. **Why Option B is the correct answer (The False Statement):** In a neonate, the **tongue is relatively large** in proportion to the oral cavity. This anatomical feature makes the neonate a mandatory nasal breather and contributes to a higher risk of airway obstruction. During intubation, a large tongue can obscure the view of the larynx, making the "small tongue" statement incorrect. **Analysis of Incorrect Options (True Statements):** * **Option A:** The neonatal epiglottis is **large, stiff, and omega-shaped (Ω)**. It is also more horizontal, which often necessitates the use of a straight laryngoscope blade (like a Miller blade) to lift it directly. * **Option C:** In children under 8–10 years, the **cricoid cartilage** (subglottis) is the narrowest part of the airway. In contrast, the glottis (vocal cords) is the narrowest part in adults. * **Option D:** The pediatric larynx is **funnel-shaped**, tapering towards the cricoid. The adult larynx is more cylindrical. **High-Yield Clinical Pearls for NEET-PG:** 1. **Level:** The neonatal larynx is situated higher in the neck, at the level of **C3–C4**, whereas the adult larynx sits at **C5–C6**. 2. **Shape:** The pediatric airway is often described as a **truncated cone**. 3. **Subglottic Edema:** Because the cricoid is the narrowest point and is a complete ring, even 1mm of mucosal edema can reduce the airway cross-sectional area by 75% in an infant (Poiseuille’s Law).

Question 63: Laryngeal web most commonly involves which region?

A. Supraglottitis
B. Glottis (Correct Answer)
C. Subglottis
D. Both supraglottis and glottis

Explanation: **Explanation:** **Laryngeal webs** are congenital or acquired membranes that span the laryngeal lumen. The correct answer is **Glottis** because approximately **75% of all laryngeal webs occur at the glottic level**, specifically involving the anterior commissure. 1. **Why Glottis is Correct:** Congenital laryngeal webs result from the failure of the laryngeal lumen to recanalize during the 10th week of gestation. Since recanalization starts posteriorly and moves anteriorly, the anterior glottis is the most common site for residual tissue. Acquired webs also most commonly affect the glottis following trauma (e.g., prolonged intubation or aggressive bilateral vocal cord surgery). 2. **Why other options are incorrect:** * **Supraglottis:** While webs can occur here, they are rare. Supraglottic pathology is more commonly associated with laryngomalacia or epiglottitis. * **Subglottis:** Subglottic involvement is less common than glottic. However, if a glottic web is thick, it may have subglottic extension (often seen in Shamblin’s Type III or IV). Isolated subglottic webs are rare compared to subglottic stenosis. * **Both Supraglottis and Glottis:** This is an uncommon distribution; most webs are localized to the glottis and may extend inferiorly rather than superiorly. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Anterior Glottis (Anterior Commissure). * **Clinical Triad:** Weak/hoarse cry (most common symptom), inspiratory stridor, and varying degrees of airway obstruction. * **Association:** Congenital glottic webs are strongly associated with **22q11.2 deletion (DiGeorge Syndrome)**. Always screen for cardiac defects if a web is found. * **Management:** Thin webs can be managed with endoscopic laser excision; thick webs may require an open procedure with the placement of a **Silastic Keel** to prevent re-adhesion of the vocal folds.

Question 64: What is the most common cause of vocal cord palsy?

A. Surgical (Correct Answer)
B. Inflammatory
C. Trauma
D. Malignancy

Explanation: **Explanation:** Vocal cord palsy results from an injury to the Recurrent Laryngeal Nerve (RLN) or the Vagus nerve. Statistically, **Surgical trauma** is the most common cause of unilateral vocal cord palsy worldwide. * **Why Surgical is Correct:** Iatrogenic injury during surgery is the leading cause, with **Thyroidectomy** being the most frequent culprit. Other surgeries include parathyroidectomy, esophagectomy, and anterior cervical spine surgery. The RLN’s intimate anatomical relationship with the inferior thyroid artery makes it highly vulnerable during ligation. * **Why Malignancy is Incorrect:** While malignancy (especially bronchogenic carcinoma, esophageal cancer, or thyroid cancer) is a significant cause, it ranks second to surgical trauma. Malignancy is, however, a more common cause of *left-sided* palsy due to the longer intrathoracic course of the left RLN. * **Why Trauma & Inflammatory are Incorrect:** Non-surgical trauma (e.g., penetrating neck injuries) and inflammatory/infectious causes (e.g., viral neuritis, tuberculosis) occur less frequently in modern clinical practice compared to surgical and neoplastic etiologies. **Clinical Pearls for NEET-PG:** 1. **Most common surgery causing palsy:** Thyroidectomy. 2. **Left vs. Right:** The **Left RLN** is more commonly involved than the right because it loops around the arch of the aorta and has a longer course. 3. **Idiopathic Palsy:** If no cause is found after thorough evaluation (including a CT from skull base to mid-thorax), it is termed "Idiopathic," which accounts for approximately 20% of cases. 4. **Ortner’s Syndrome:** Left RLN palsy caused by cardiovascular conditions (e.g., mitral stenosis leading to left atrial enlargement).

Question 65: A 20-year-old male presents with throat pain and easy fatigability of his voice. Indirect laryngeal examination revealed both cords approximately well but leaving a triangular gap in the interarytenoid. What is your diagnosis?

A. Mutational falsetto voice
B. Functional aphonia
C. Ventricular dysphonia
D. Phonasthenia (Correct Answer)

Explanation: ### **Explanation** The correct answer is **Phonasthenia** (Muscular Dysphonia). **1. Why Phonasthenia is correct:** Phonasthenia refers to "weakness of the voice" caused by fatigue or weakness of the laryngeal muscles (specifically the **internal thyroarytenoids** and the **transverse arytenoid**). * **Clinical Presentation:** It typically affects professional voice users (teachers, singers) or young adults, presenting with throat pain, vocal fatigue, and a weak voice that worsens with use. * **Laryngoscopic Finding:** On indirect laryngoscopy, the vocal cords approximate in the anterior two-thirds but leave a **triangular gap in the posterior one-third (interarytenoid area)** due to weakness of the transverse arytenoid muscle. This is the classic "keyhole" or "triangular" glottis seen in this condition. **2. Why other options are incorrect:** * **Mutational Falsetto (Puberphonia):** Seen in adolescent males who fail to transition to a low-pitch voice. The larynx is often anatomically normal but tilted upwards; it does not typically present with a posterior triangular gap. * **Functional Aphonia:** A psychological condition where the patient speaks in a whisper. On coughing (reflexive action), the vocal cords adduct normally, which distinguishes it from organic paralysis. * **Ventricular Dysphonia (Plica Ventricularis):** This occurs when the **false vocal cords** (ventricular bands) take over the function of the true vocal cords. It results in a rough, low-pitched, hoarse voice. **3. High-Yield Clinical Pearls for NEET-PG:** * **Muscle involved in posterior gap:** Transverse arytenoid. * **Muscle involved in elliptical gap:** Internal thyroarytenoid (Vocalis). * **Treatment for Phonasthenia:** Primarily **voice therapy** and vocal hygiene; surgery is not indicated. * **Key differentiator:** If the gap is "bow-shaped" or "elliptical," think of Internus Paresis (Thyroarytenoid weakness). If the gap is "triangular" at the back, think of Phonasthenia.

Question 66: What is the focal length of the mirror typically used in a headlamp?

A. 85 mm
B. 150 mm
C. 250 mm (Correct Answer)
D. 400 mm

Explanation: ### Explanation In ENT practice, the **Bull’s Eye Lamp** (a source of light) is used in conjunction with a **Clar’s Head Mirror**. The head mirror is a **concave mirror** designed to reflect and focus light onto the area being examined (e.g., the ear canal or nasal cavity). **1. Why 250 mm is the Correct Answer:** The focal length of the head mirror is specifically designed to be **250 mm (25 cm)**. This is because 25 cm is the **average comfortable working distance** for an ENT surgeon and corresponds to the **near point of distinct vision** for the human eye. By having a focal length of 250 mm, the mirror produces a sharp, bright, and well-defined spot of light at the exact distance where the clinician’s eyes naturally focus during an examination. **2. Analysis of Incorrect Options:** * **85 mm & 150 mm:** These focal lengths are too short. Using these would require the surgeon to stand extremely close to the patient’s face, which is impractical and unhygienic for clinical examination. * **400 mm:** This focal length is too long for a standard head mirror. However, it is a high-yield number in another context: **400 mm** is the standard focal length of the objective lens used in an **Operating Microscope** for Laryngoscopy/Microlaryngeal surgery. **3. Clinical Pearls for NEET-PG:** * **The Hole in the Mirror:** The Clar’s head mirror has a central hole (approx. 1-2 cm). The clinician looks through this hole with their **dominant eye** to achieve **co-axial illumination** (light and vision are in the same axis), which eliminates shadows. * **Positioning:** The lamp should be placed above and behind the patient’s left shoulder for a right-handed surgeon. * **Microscope Focal Lengths:** 200 mm (Ear surgery), 250 mm (Nasal surgery), 400 mm (Laryngeal surgery).

Question 67: Closure of the glottis is caused by all of the following except:

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

Explanation: ### Explanation The glottis is closed by the **adduction** of the vocal cords. To answer this question, one must distinguish between the intrinsic muscles of the larynx that act as adductors (closers) and the sole abductor (opener). **1. Why "Posterior Cricoarytenoid" is the correct answer:** The **Posterior Cricoarytenoid (PCA)** is the **sole abductor** of the vocal cords. It originates from the posterior surface of the cricoid lamina and inserts into the muscular process of the arytenoid cartilage. When it contracts, it rotates the arytenoids laterally, widening the rima glottidis. Therefore, it does not cause closure; it opens the glottis. **2. Why the other options are incorrect (Adductors):** * **Lateral Cricoarytenoid:** This is the primary adductor of the vocal cords. It rotates the muscular process anteriorly, bringing the vocal processes together. * **Thyroarytenoid:** This muscle shortens and thickens the vocal cords, contributing to the closure of the anterior glottis. * **Cricothyroid:** While primarily known as the "tensor" of the vocal cords (increasing pitch), it also acts as a weak adductor, helping to close the glottis. **Clinical Pearls for NEET-PG:** * **"Safety Muscle of the Larynx":** The Posterior Cricoarytenoid is called the safety muscle because it is the only muscle that keeps the airway open. * **Nerve Supply:** All intrinsic muscles of the larynx are supplied by the **Recurrent Laryngeal Nerve (RLN)**, *except* the **Cricothyroid**, which is supplied by the **External Laryngeal Nerve**. * **Bilateral RLN Palsy:** This results in the vocal cords remaining in a paramedian position because the PCA (abductor) is paralyzed, leading to acute respiratory distress/stridor.

Question 68: What is the antibiotic of choice for acute epiglottitis?

A. Tetracycline
B. Chloramphenicol
C. Cephalosporin (Correct Answer)
D. Penicillin

Explanation: **Explanation:** **Acute Epiglottitis** is a life-threatening medical emergency characterized by rapid inflammation of the epiglottis. The primary causative agent, particularly in non-immunized children, is ***Haemophilus influenzae* type b (Hib)**. Other pathogens include *Streptococcus pneumoniae* and *Staphylococcus aureus*. **Why Cephalosporins are the Correct Choice:** Third-generation cephalosporins (e.g., **Ceftriaxone** or **Cefotaxime**) are the drugs of choice because they provide excellent coverage against beta-lactamase-producing strains of *H. influenzae* and have superior penetration into the respiratory tissues. They have replaced older regimens due to their high efficacy and lower toxicity profile. **Analysis of Incorrect Options:** * **Tetracycline (A):** Generally contraindicated in children (due to bone/teeth effects) and lacks reliable activity against the primary pathogens causing epiglottitis. * **Chloramphenicol (B):** Historically used as a first-line agent for *H. influenzae* infections; however, it has been replaced by cephalosporins due to the risk of serious side effects like bone marrow suppression (aplastic anemia). * **Penicillin (D):** Most strains of *H. influenzae* are now resistant to penicillin and its derivatives (like Ampicillin) due to the production of beta-lactamase enzymes. **High-Yield Clinical Pearls for NEET-PG:** * **X-ray Finding:** The classic **"Thumb sign"** is seen on a lateral neck X-ray (swollen epiglottis). * **Clinical Presentation:** The "4 Ds"—**D**rooling, **D**ysphagia, **D**istress (respiratory), and **D**ysphonia. * **Management Priority:** The first priority is **airway maintenance** (intubation or tracheostomy). Never examine the throat with a tongue depressor in a suspected case, as it may trigger fatal laryngospasm. * **Position:** The patient often assumes the **"Tripod position"** to maximize airway diameter.

Question 69: All of the following conditions affect the posterior part of the larynx except?

A. Contact ulcer
B. Pachydermia laryngis
C. Intubation granuloma
D. Lupus (Correct Answer)

Explanation: **Explanation:** The larynx is anatomically divided into anterior and posterior segments, each prone to specific pathologies based on the underlying tissue type (cartilaginous vs. membranous). **Why Lupus is the correct answer:** Lupus (Laryngeal Lupus) is a chronic granulomatous condition that characteristically involves the **anterior part** of the larynx. It most commonly affects the **epiglottis** (often leading to a "turban-shaped" epiglottis or destruction of the free edge) and the **vestibule**. Unlike other granulomatous diseases like Tuberculosis, Lupus is relatively painless and does not typically involve the posterior glottis. **Analysis of incorrect options (Posterior Laryngeal involvement):** * **Contact Ulcer:** Occurs due to mechanical trauma (vocal abuse) or LPR (Laryngopharyngeal Reflux). It specifically affects the **vocal process of the arytenoid cartilage**, which is located posteriorly. * **Pachydermia Laryngis:** A form of chronic hypertrophic laryngitis characterized by epithelial thickening. It classically involves the **interarytenoid notch** and the posterior third of the vocal cords. * **Intubation Granuloma:** This is a post-traumatic granuloma caused by the pressure of an endotracheal tube. Since the tube rests against the **posterior glottis** (vocal processes of arytenoids), the granuloma forms in this posterior location. **NEET-PG High-Yield Pearls:** * **Posterior Larynx Pathologies:** Contact ulcer, Pachydermia, Intubation granuloma, and **Tuberculosis** (TB classically affects the posterior part, presenting as a "mouse-nibbled" appearance). * **Anterior Larynx Pathologies:** Lupus, Laryngeal webs, and most Carcinomas (typically involve the anterior two-thirds of the membranous cord). * **Laryngeal Lupus vs. TB:** TB is painful and posterior; Lupus is painless and anterior.

Question 70: Which of the following statements about laryngomalacia is FALSE?

A. It is characterized by an omega-shaped epiglottis.
B. Reassurance of the patient is the primary management.
C. The condition is typically first noticed in the initial weeks of life.
D. Stridor is primarily expiratory in nature. (Correct Answer)

Explanation: **Explanation:** Laryngomalacia is the most common congenital anomaly of the larynx and the leading cause of congenital stridor. **1. Why Option D is the Correct Answer (The False Statement):** In laryngomalacia, the supraglottic structures (epiglottis, arytenoids) are flaccid. During **inspiration**, the negative pressure created by the expanding chest causes these structures to collapse inward into the glottic opening, obstructing airflow and producing **inspiratory stridor**. Expiratory stridor is typically associated with lower airway pathologies (tracheobronchial). **2. Analysis of Other Options:** * **Option A:** A classic finding on flexible laryngoscopy is a long, narrow epiglottis that curls upon itself, known as an **omega-shaped (Ω) epiglottis**. * **Option B:** In approximately 90% of cases, the condition is self-limiting and resolves spontaneously by 18–24 months as the laryngeal cartilage matures. Therefore, **reassurance and observation** are the mainstays of treatment. * **Option C:** Symptoms typically manifest within the **first 2 weeks of life**, peaking at 6–9 months. **High-Yield Clinical Pearls for NEET-PG:** * **Positioning:** Stridor worsens when the infant is supine, crying, or feeding, and **improves when prone** (on the stomach). * **Diagnosis:** The gold standard is **Flexible Fiberoptic Laryngoscopy** in an awake patient to observe the dynamic collapse of supraglottic tissues. * **Surgical Management:** Reserved for severe cases (failure to thrive, cor pulmonale, or severe apnea). The procedure of choice is **Supraglottoplasty**.

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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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