Otolaryngology Basics — MCQs

Otolaryngology Basics Indian Medical PG Practice Questions and MCQs

Question 101: Which is the most common site for carcinoma of the larynx?

A. Suprahyoid epiglottis
B. Infrahyoid epiglottis
C. Glottis (Correct Answer)
D. Subglottis

Explanation: **Explanation:** The larynx is anatomically divided into three regions: the supraglottis, glottis, and subglottis. In the Indian subcontinent and globally, the **Glottis** (vocal cords) is the most common site for laryngeal carcinoma, accounting for approximately **60–65%** of cases. **Why Glottis is the correct answer:** * **Incidence:** The glottis is the most frequent site of origin for Squamous Cell Carcinoma (SCC) of the larynx. * **Clinical Presentation:** Glottic tumors present early with **hoarseness of voice**, leading to earlier diagnosis. * **Prognosis:** They have the best prognosis because the vocal cords have **sparse lymphatic drainage**, significantly reducing the risk of early nodal metastasis. **Analysis of Incorrect Options:** * **Suprahyoid and Infrahyoid Epiglottis (Supraglottis):** These are parts of the supraglottic larynx. Supraglottic cancers are the second most common (approx. 30–35%). Unlike glottic tumors, they have a rich lymphatic network, often presenting late with cervical lymphadenopathy. * **Subglottis:** This is the rarest site for primary laryngeal carcinoma (less than 1–2%). These tumors are often silent until they cause airway obstruction or involve the vocal cords. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factor:** Smoking is the strongest risk factor; Alcohol acts synergistically. * **Histology:** Most common type is **Squamous Cell Carcinoma (SCC)**. * **Lymphatic Drainage:** The Glottis is unique for its lack of lymphatics (Reinke’s space). * **Staging Tip:** A "fixed vocal cord" automatically upgrades a tumor to **T3** stage. * **Treatment:** Early glottic cancer (T1/T2) can be treated equally effectively with either Radiotherapy or Laser Excision.

Question 102: Stylalgia may present with ear pain. Which nerve may refer the pain?

A. Auriculotemporal nerve
B. Posterior auricular nerve
C. Occipital nerve
D. Glossopharyngeal nerve (Correct Answer)

Explanation: **Explanation:** **Stylalgia (Eagle’s Syndrome)** occurs due to an elongated styloid process or calcification of the stylohyoid ligament. This anatomical variation causes irritation of the surrounding structures, primarily the **Glossopharyngeal nerve (CN IX)**, which passes in close proximity to the styloid process. **Why Glossopharyngeal nerve is correct:** The Glossopharyngeal nerve provides sensory innervation to the oropharynx and the base of the tongue. It also gives off the **Jacobson’s nerve (tympanic branch)**, which provides sensory supply to the middle ear. In Stylalgia, irritation of CN IX in the tonsillar fossa results in **referred otalgia** (ear pain) via this tympanic branch. This is a classic example of pain originating in the pharynx being felt in the ear. **Why other options are incorrect:** * **Auriculotemporal nerve (CN V3):** While it causes referred otalgia, it is typically associated with Temporomandibular Joint (TMJ) disorders or molar tooth pathologies, not the styloid process. * **Posterior auricular nerve:** This is a branch of the Facial nerve (CN VII) primarily supplying motor function to muscles behind the ear; it is not the mediator for referred pain in Stylalgia. * **Occipital nerve:** This supplies the scalp and back of the head; irritation here leads to occipital neuralgia, not pharyngeal-related ear pain. **High-Yield NEET-PG Pearls:** * **Eagle’s Syndrome Presentation:** Characterized by "3 Ts": **T**hroat pain, **T**innitus/Otalgia, and **T**ongue pain (especially during swallowing). * **Diagnosis:** Palpation of the elongated styloid process in the tonsillar fossa triggers pain. * **Treatment:** Medical (NSAIDs/Carbamazepine) or Surgical (Styloidectomy via trans-oral or cervical approach). * **Other nerves causing referred otalgia:** V3 (teeth/TMJ), CN X (larynx/hypopharynx), and C2-C3 spinal nerves (cervical spine).

Question 103: Facial nerve stimulation during testing is indicated by contraction of which muscle?

A. Temporalis
B. Masseter
C. Sternocleidomastoid
D. Orbicularis oris (Correct Answer)

Explanation: **Explanation:** The **Facial Nerve (Cranial Nerve VII)** is the nerve of the **second branchial arch**. Its primary motor function is to provide innervation to the muscles of facial expression. 1. **Why Orbicularis Oris is Correct:** The **Orbicularis oris** is a muscle of facial expression located around the mouth, responsible for closing and puckering the lips. It is supplied by the buccal and marginal mandibular branches of the facial nerve. During electrodiagnostic testing (like Electroneuronography or Nerve Excitability Tests), electrodes are placed over muscles supplied by CN VII to record Compound Muscle Action Potentials (CMAP). Contraction of the orbicularis oris or orbicularis oculi confirms successful stimulation of the facial nerve. 2. **Why Other Options are Incorrect:** * **Temporalis & Masseter (Options A & B):** These are **muscles of mastication**, which are derived from the **first branchial arch**. They are innervated by the mandibular division of the **Trigeminal Nerve (CN V3)**. * **Sternocleidomastoid (Option C):** This muscle is responsible for head rotation and flexion. It is innervated by the **Spinal Accessory Nerve (CN XI)** and branches from the cervical plexus (C2, C3). **Clinical Pearls for NEET-PG:** * **Intratemporal Course:** The facial nerve is the longest nerve to travel through a bony canal (Fallopian canal). * **Most Common Site of Injury:** The **Geniculate Ganglion** is the most common site for herpes zoster oticus (Ramsay Hunt Syndrome). * **Topognostic Testing:** Schirmer’s test (Greater Superficial Petrosal Nerve), Stapedial reflex (Nerve to Stapedius), and Taste/Salivary flow (Chorda Tympani) help localize the level of a facial nerve lesion. * **Muscle Mnemonic:** The facial nerve also supplies the **Stapedius**, **Posterior belly of Digastric**, and **Stylohyoid** muscles.

Question 104: What is the cadaveric position of the vocal cords?

A. Midline
B. 1.5 mm from midline
C. 3.5 mm from midline (Correct Answer)
D. 7.5 mm from midline

Explanation: ### Explanation The position of the vocal cords is determined by the balance of intrinsic laryngeal muscles. In a **cadaveric state**, all muscles (abductors, adductors, and tensors) are paralyzed. The cords settle into a neutral, passive position due to the inherent elasticity of the laryngeal tissues and the structural alignment of the cricoarytenoid joints. **1. Why 3.5 mm is correct:** The **cadaveric position** (also known as the neutral position) is characterized by the vocal cords being **3.5 mm from the midline**. This is the position seen after death or in a complete "total" laryngeal paralysis (where both the recurrent laryngeal nerve and the superior laryngeal nerve are non-functional). **2. Analysis of Incorrect Options:** * **A. Midline (0 mm):** This is the **Median position**, seen during phonation or in bilateral recurrent laryngeal nerve palsy (where the cricothyroid muscle, supplied by the superior laryngeal nerve, still acts as an adductor). * **B. 1.5 mm from midline:** This is the **Paramedian position**. It is typically seen in isolated Recurrent Laryngeal Nerve (RLN) palsy. * **D. 7.5 mm from midline:** This is the **Full Abduction position**, achieved during deep inspiration by the action of the posterior cricoarytenoid muscle (the only abductor of the vocal cords). **3. Clinical Pearls for NEET-PG:** * **Semon’s Law:** States that in progressive lesions of the RLN, the abductor fibers are injured first, causing the cord to move to the midline (adducted) before eventually reaching the cadaveric position if the paralysis becomes complete. * **Wagner and Grossman Theory:** Explains that if the Superior Laryngeal Nerve is intact, the cricothyroid muscle keeps the cord in the paramedian position; if both nerves are gone, it moves to the cadaveric position. * **Gentle Abduction:** 5 mm from midline (normal quiet breathing).

Question 105: What is true about Bell's palsy?

A. It is the most common cause of facial palsy.
B. It is associated with tinnitus and vertigo.
C. It can present with crocodile tears and synkinesis.
D. There is no role for steroids in its management. (Correct Answer)

Explanation: **Explanation:** **Bell’s Palsy** is an acute, lower motor neuron (LMN) facial nerve paralysis of unknown etiology, though it is strongly linked to the reactivation of the Herpes Simplex Virus (HSV) in the geniculate ganglion. **Why the options are evaluated:** * **Option D (Correct Answer):** This option is technically **incorrect** in clinical practice, as **Corticosteroids (Prednisolone)** are the **gold standard** and mainstay of treatment. They reduce nerve edema and improve recovery rates if started within 72 hours. *Note: In the context of this specific MCQ, if "D" is marked as the correct statement by the examiner, it likely represents a factual error in the question key or a "least likely" scenario, as steroids are definitively indicated.* * **Option A:** This is a **true** statement. Bell’s palsy is the most common cause of unilateral facial paralysis worldwide (diagnosis of exclusion). * **Option B:** While mild ear pain is common, significant **tinnitus and vertigo** are characteristic of **Ramsay Hunt Syndrome** (Herpes Zoster Oticus), not typical Bell’s palsy. * **Option C:** Crocodile tears (bogorad syndrome) and synkinesis are complications of **faulty regeneration** of the nerve *after* the acute phase; they are not presenting features of the palsy itself. **Clinical Pearls for NEET-PG:** 1. **House-Brackmann Scale:** Used to grade the severity of facial nerve palsy (Grade I is normal, Grade VI is total paralysis). 2. **Schirmer’s Test:** Used to localise the lesion (at or proximal to the geniculate ganglion if lacrimation is reduced). 3. **Prognosis:** 85% of patients show signs of recovery within 3 weeks. 4. **Bell’s Phenomenon:** Upward and outward rolling of the eyeball when the patient attempts to close the eyelid (a normal protective reflex made visible by the paralysis).

Question 106: The laryngeal saccules (water sacs) are present in which space?

A. Paraglottic space
B. Piriform fossa
C. Reinke's space
D. Laryngeal ventricles (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Laryngeal ventricles** The **laryngeal saccule** (also known as the appendix of the ventricle) is a small, blind-ending pouch of mucous membrane that extends upward from the anterior part of the **laryngeal ventricle** (Sinus of Morgagni). It lies between the vestibular fold (false cord) and the inner surface of the thyroid cartilage. It contains numerous mucous glands that lubricate the vocal folds, earning it the nickname "the oil can of the larynx." #### Analysis of Incorrect Options: * **A. Paraglottic space:** This is a potential space lateral to the laryngeal ventricles, bounded by the thyroid cartilage and the conus elasticus. While the saccule resides within this space anatomically, it is an outgrowth *of* the ventricle, not the space itself. * **B. Piriform fossa:** This is a part of the **hypopharynx**, located lateral to the aryepiglottic folds. It is a common site for foreign bodies and malignancies but is external to the internal laryngeal framework. * **C. Reinke's space:** This is a potential subepithelial space of the **true vocal folds** (between the epithelium and the vocal ligament). It is the site of Reinke’s edema, typically seen in smokers. #### NEET-PG High-Yield Pearls: * **Laryngocele:** An abnormal cystic expansion of the saccule filled with air. If it fills with pus, it is called a **laryngopyocele**. * **Clinical Presentation:** Internal laryngoceles present with hoarseness or airway obstruction; external laryngoceles present as a neck mass that expands with the Valsalva maneuver. * **Function:** The saccule’s primary role is the lubrication of the true vocal cords via its high density of goblet cells.

Question 107: What materials are used for injection in thyroplasty?

A. Gelatin powder
B. Collagen
C. Acellular micronized human cartilage
D. All of the above (Correct Answer)

Explanation: **Explanation:** Injection Thyroplasty (also known as Injection Laryngoplasty) is a procedure used to treat **unilateral vocal cord paralysis** or glottic insufficiency. The goal is to "bulk up" the paralyzed vocal fold, moving it toward the midline so the functioning fold can make contact, thereby improving voice quality and preventing aspiration. The choice of injection material depends on whether the desired effect is temporary or permanent: 1. **Gelatin powder (e.g., Gelfoam):** This is a temporary material. It is typically mixed with saline and provides bulk for approximately 4–6 weeks. It is ideal for patients where nerve recovery is expected. 2. **Collagen:** Bovine or human-derived collagen is used as a short-to-medium-term filler. It is biocompatible and provides excellent mucosal wave preservation, though it eventually resorbs. 3. **Acellular micronized human cartilage (e.g., Cymetra):** This is a particulate form of decellularized allograft. It acts as a long-term injectable scaffold that lasts longer than gelatin or collagen, often used when permanent medialization is desired without open surgery. Since all three materials are established options for laryngeal augmentation, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Indication:** Primarily used for **Unilateral Vocal Cord Paralysis** (Position of the cord: Paramedian). * **Other Materials:** Teflon (historical, now avoided due to granuloma formation), Hydroxyapatite (Radiesse), and Autologous Fat. * **Isshiki Classification:** * **Type I:** Medialization (Most common; for paralysis). * **Type II:** Lateralization (For spasmodic dysphonia). * **Type III:** Relaxation/Shortening (To lower pitch). * **Type IV:** Stretching/Tension (To raise pitch).

Question 108: What is the position of the vocal cords when the cricoarytenoids are in neutral positions?

A. Paramedian
B. Median
C. Intermediate (Correct Answer)
D. Abducted

Explanation: ### Explanation The position of the vocal cords is determined by the balance of intrinsic laryngeal muscles and the status of the recurrent and superior laryngeal nerves. **1. Why "Intermediate" is correct:** The **Intermediate (Cadaveric) position** occurs when all laryngeal muscles are paralyzed (as seen in combined palsy of the Recurrent Laryngeal Nerve and Superior Laryngeal Nerve) or when the cricoarytenoid joints are in a **neutral, passive state**. In this position, the vocal cords lie approximately 3.5 mm from the midline. It is the "neutral" position because no active muscular force is pulling the cords toward the midline (adduction) or away from it (abduction). **2. Analysis of Incorrect Options:** * **Median (0 mm):** The cords meet in the midline. This occurs during phonation or in bilateral Adductor Spasm. * **Paramedian (1.5 mm):** This is the position typically seen in **isolated Recurrent Laryngeal Nerve (RLN) palsy**. The intact Superior Laryngeal Nerve (Cricothyroid muscle) keeps the cord slightly adducted toward the midline. * **Abducted:** This occurs during normal inspiration (Gentle abduction) or deep inspiration (Full abduction, 7–9 mm), mediated by the **Posterior Cricoarytenoid** (the only abductor). **3. Clinical Pearls for NEET-PG:** * **The "Safety Muscle" of the Larynx:** Posterior Cricoarytenoid (it opens the glottis). * **Semon’s Law:** In progressive lesions of the RLN, the abductor fibers are injured before the adductor fibers; thus, the cord initially moves to a midline/paramedian position. * **Wagner and Grossman Hypothesis:** Explains that if the RLN is paralyzed but the SLN is intact, the cord stays in the paramedian position due to the adductive action of the cricothyroid. * **Positions Summary:** * Median (Phonation) * Paramedian (RLN Palsy) * Intermediate (Total Palsy/Neutral) * Full Abduction (Deep Inspiration)

Question 109: Kashima operation is done for:

A. Recurrent cholesteatoma
B. Bilateral vocal cord palsy (Correct Answer)
C. Atrophic rhinitis
D. Choanal atresia

Explanation: **Explanation:** **Kashima Operation (Laser Posterior Cordectomy)** is a surgical procedure primarily performed for **Bilateral Abductor Vocal Cord Palsy**. In this condition, both vocal cords remain fixed in the midline, leading to a compromised airway and inspiratory stridor. The goal of the Kashima operation is to widen the glottic chink to improve breathing while attempting to preserve voice quality. It involves using a CO2 laser to remove a wedge-shaped portion of the posterior part of one or both vocal cords (near the vocal process of the arytenoid). **Analysis of Options:** * **Bilateral Vocal Cord Palsy (Correct):** The procedure addresses the respiratory distress caused by the narrowed airway by creating a permanent posterior opening. * **Recurrent Cholesteatoma:** This is managed via mastoidectomy (Canal Wall Down or Canal Wall Up) or "Second-look" surgery, not laryngeal procedures. * **Atrophic Rhinitis:** Surgical treatments include Young’s operation or Modified Young’s operation (closing the nostrils to allow the mucosa to heal). * **Choanal Atresia:** This is managed via transnasal or transpalatal repair using endoscopes and stents. **Clinical Pearls for NEET-PG:** * **Woodman’s Operation:** Another surgery for bilateral cord palsy; it is an *extralaryngeal* approach involving arytenoidectomy. * **Key Distinction:** Kashima is an *endoscopic* (intralaryngeal) laser procedure, making it less invasive than older open techniques. * **Trade-off:** In all surgeries for bilateral cord palsy, there is a compromise: improving the **airway** often leads to a slight worsening of **voice quality** (breathiness) and an increased risk of aspiration.

Question 110: A patient presented with stridor and dyspnoea which developed after an attack of upper respiratory tract infection. On examination, a 3-mm glottic opening was found. All of the following are used in the management except?

A. Tracheostomy
B. Arytenoidectomy
C. Teflon injection (Correct Answer)
D. Cordectomy

Explanation: ### **Explanation** The clinical presentation of stridor and dyspnoea following an upper respiratory tract infection, combined with a narrow **3-mm glottic opening**, points toward **Bilateral Abductor Vocal Cord Paralysis**. In this condition, the vocal cords are stuck in the median or paramedian position, severely compromising the airway while often preserving a near-normal voice. #### **Why Teflon Injection is the Correct Answer (The "Except")** **Teflon (Polytef) injection** is a medialization procedure. It is used to move a vocal cord toward the midline. This is indicated in **Unilateral Adductor Paralysis** (where there is a large glottic gap causing aspiration and hoarseness). In a patient who already has a dangerously narrow 3-mm airway, injecting a bulking agent like Teflon would further medialize the cords, completely obstructing the airway and leading to fatal respiratory distress. #### **Analysis of Other Options** * **Tracheostomy (Option A):** This is the immediate gold-standard treatment to bypass the upper airway obstruction and secure the airway in acute respiratory distress. * **Arytenoidectomy (Option B):** A surgical procedure (e.g., Woodman’s operation) where the arytenoid cartilage is removed to widen the posterior glottis, improving the airway. * **Cordectomy (Option D):** Specifically, **Posterior Cordectomy** (Kashima’s procedure) involves removing a portion of the vocal cord to increase the glottic space. #### **NEET-PG High-Yield Pearls** * **Bilateral Abductor Paralysis:** Most common cause is **Iatrogenic** (Post-thyroidectomy injury to bilateral Recurrent Laryngeal Nerves). * **Management Goal:** The "Trade-off" — Procedures that improve the airway (widening the glottis) usually worsen the quality of the voice. * **Static Procedures:** Lateralization thyroplasty (Isshiki Type II) is also used to widen the glottis. * **Teflon Injection:** Now largely replaced by Gelfoam or Hydroxyapatite due to the risk of "Teflon Granuloma."

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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