Otolaryngology Basics — MCQs

Otolaryngology Basics Indian Medical PG Practice Questions and MCQs

Question 151: Hypothyroidism can cause all of the following symptoms except:

A. Hoarseness
B. Dryness of mouth (Correct Answer)
C. Nasal stuffiness
D. Vertigo

Explanation: **Explanation:** Hypothyroidism is a systemic metabolic disorder characterized by the accumulation of **glycosaminoglycans (GAGs)**, such as hyaluronic acid, in various tissues. This leads to the classic "myxedematous" changes. **Why "Dryness of Mouth" is the correct answer:** Dryness of mouth (Xerostomia) is typically associated with conditions like Sjögren's syndrome, radiotherapy, or anticholinergic drugs. In hypothyroidism, the opposite often occurs; the tongue becomes enlarged (**macroglossia**) due to GAG deposition, but salivary flow is generally not decreased. **Analysis of Incorrect Options:** * **Hoarseness:** This is a very common ENT manifestation of hypothyroidism. It occurs due to the deposition of GAGs in the **Reinke’s space** of the vocal cords, leading to thickening and edema (myxedema of the larynx). * **Nasal Stuffiness:** The nasal mucosa undergoes vasomotor-like changes. Myxedematous infiltration of the nasal turbinates leads to swelling and increased airway resistance, causing chronic nasal congestion. * **Vertigo:** Hypothyroidism can affect the inner ear. It is associated with endolymphatic hydrops and vestibular dysfunction, leading to symptoms of vertigo, tinnitus, and sensorineural hearing loss. **High-Yield Clinical Pearls for NEET-PG:** * **Hearing Loss:** Hypothyroidism is a known cause of reversible sensorineural hearing loss (SNHL). * **Macroglossia:** It is a classic sign; always consider hypothyroidism or amyloidosis when presented with an enlarged tongue. * **Goiter:** While often associated with hyperthyroidism (Graves'), it is frequently seen in hypothyroidism (Hashimoto’s) due to elevated TSH levels stimulating thyroid tissue. * **Reinke’s Edema:** While smoking is the primary cause, hypothyroidism is an important systemic differential for diffuse vocal cord swelling.

Question 152: Which laryngeal condition can present with hoarseness and stridor?

A. Unilateral vocal cord abductor paralysis
B. Bilateral vocal cord abductor paralysis
C. Both unilateral and bilateral vocal cord abductor paralysis
D. Neither unilateral nor bilateral vocal cord abductor paralysis (Correct Answer)

Explanation: To understand this question, we must differentiate between the clinical presentations of unilateral and bilateral vocal cord paralysis based on the position of the cords. ### **1. Why Option D is Correct** The question asks for a condition presenting with **both** hoarseness and stridor. * **Unilateral Abductor Paralysis:** The affected cord lies in the paramedian position. The healthy cord can still meet it for phonation (minimal hoarseness) and the airway remains adequate (no stridor). * **Bilateral Abductor Paralysis:** Both cords lie in the paramedian position. Because the cords are close together, the voice is often **near-normal**, but the glottic airway is severely compromised, leading to **inspiratory stridor**. Since neither condition typically presents with both symptoms simultaneously, **Option D** is the correct choice. ### **2. Analysis of Incorrect Options** * **Option A (Unilateral):** Presents primarily with mild hoarseness or breathiness. Stridor is absent because the contralateral normal cord provides sufficient abduction for breathing. * **Option B (Bilateral):** This is a classic "trap" in ENT. While it causes severe stridor (a surgical emergency), the voice remains remarkably good because the cords are positioned close enough to vibrate during phonation. * **Option C:** Incorrect as it combines the logic of A and B. ### **3. Clinical Pearls for NEET-PG** * **The Rule of Thumb:** If the airway is bad (stridor), the voice is usually good. If the voice is bad (hoarseness), the airway is usually good. * **Semon’s Law:** In progressive lesions of the recurrent laryngeal nerve, abductor fibers are insulted first; hence, the cord initially moves to a midline/paramedian position. * **Management:** Bilateral abductor paralysis often requires an urgent tracheostomy or lateralization procedures (e.g., Woodman’s operation) to secure the airway. * **Most Common Cause:** Thyroid surgery (injury to the Recurrent Laryngeal Nerve) is the most high-yield etiology for these conditions.

Question 153: In MPDS, which muscle is most likely to exhibit tenderness?

A. Tendon poratus
B. Buccinator
C. Masseter
D. Lateral pterygoid (Correct Answer)

Explanation: **Explanation:** **Myofascial Pain Dysfunction Syndrome (MPDS)** is a psychophysiological disorder characterized by pain, muscle tenderness, and restricted jaw movement, often triggered by stress-induced bruxism or clenching. **Why Lateral Pterygoid is the Correct Answer:** The **lateral pterygoid** is the most frequently involved muscle in MPDS and is typically the first to exhibit tenderness. This is because it is the primary muscle responsible for the protrusion and lateral excursion of the mandible. In patients with MPDS, chronic overactivity and spasms of this muscle lead to pain that is often referred to the preauricular area, mimicking an earache. Clinical examination usually reveals tenderness behind the maxillary tuberosity or via intraoral palpation. **Analysis of Incorrect Options:** * **Tendon poratus:** This is not a recognized anatomical structure involved in mastication or MPDS. * **Buccinator:** While it is a muscle of the cheek, it is considered a muscle of facial expression (innervated by the facial nerve) rather than a muscle of mastication. It does not play a primary role in the pathophysiology of MPDS. * **Masseter:** The masseter is frequently involved in MPDS and is often the second most common muscle to show tenderness. However, the lateral pterygoid remains the most common and earliest site of involvement. **Clinical Pearls for NEET-PG:** * **Triad of MPDS:** Pain (preauricular), muscle tenderness, and clicking/popping sounds in the TMJ. * **Management:** Reassurance, soft diet, analgesics (NSAIDs), and muscle relaxants. Occlusal splints are used for bruxism. * **Differential Diagnosis:** Must be distinguished from Costen’s Syndrome (which specifically attributes TMJ pain to malocclusion and ear symptoms). * **Nerve Supply:** All muscles of mastication (including lateral pterygoid) are supplied by the mandibular branch of the Trigeminal nerve (V3).

Question 154: Which of the following statements about papilloma is incorrect?

A. Solitary papilloma is more common in adults, and the most common presentation is a change in voice.
B. Solitary papilloma is more aggressive, has a poor prognosis, and malignant transformation is common. (Correct Answer)
C. Multiple papilloma is more common in children, and the most common presentation is a hoarse cry.
D. Early treatment leads to better results in multiple papilloma.

Explanation: **Explanation:** Laryngeal papillomatosis, caused by **Human Papillomavirus (HPV) types 6 and 11**, is the most common benign neoplasm of the larynx. It is categorized into two types: Juvenile-onset (Multiple) and Adult-onset (Solitary). **Why Option B is the correct (incorrect statement) answer:** Contrary to the statement, **Solitary (Adult) papilloma is generally less aggressive** and has a better prognosis compared to the juvenile form. While malignant transformation can occur (especially in smokers or those with a history of irradiation), it is **rare**. In contrast, the multiple/juvenile form is highly recurrent, often requiring dozens of surgical procedures, and carries a higher risk of airway obstruction. **Analysis of other options:** * **Option A:** Adult-onset papilloma usually presents as a single lesion. Since it typically involves the vocal cords, **hoarseness or change in voice** is the most frequent symptom. * **Option C:** Juvenile-onset Recurrent Respiratory Papillomatosis (JORRP) is characterized by multiple growths. In infants and young children, the earliest sign is often a **hoarse cry** or stridor. * **Option D:** Early surgical intervention (typically via CO2 laser or microdebrider) is crucial in multiple papilloma to maintain airway patency and prevent distal seeding into the tracheobronchial tree. **NEET-PG High-Yield Pearls:** * **Etiology:** HPV 6 and 11 (Low risk); HPV 16 and 18 (High risk for malignancy). * **Juvenile Form:** Often acquired during vaginal delivery from a mother with genital warts (Condyloma acuminata). * **Treatment Gold Standard:** Microlaryngeal surgery with **CO2 laser** or **Microdebrider**. * **Adjuvant Therapy:** Cidofovir (antiviral) is sometimes used for aggressive recurrences. * **Prevention:** The quadrivalent HPV vaccine has shown efficacy in reducing the incidence.

Question 155: What is the management of stage I laryngeal carcinoma?

A. Partial laryngectomy
B. Total laryngectomy
C. Radiotherapy (Correct Answer)
D. Laser ablation

Explanation: **Explanation:** The management of **Stage I Laryngeal Carcinoma** (T1N0M0) aims to achieve a high cure rate while preserving laryngeal function, specifically the quality of voice. **Why Radiotherapy is the Correct Answer:** For Stage I lesions, both **Radiotherapy (RT)** and **Endoscopic Laser Excision** are considered primary treatment modalities. However, in the context of standard NEET-PG patterns, Radiotherapy is often favored as the classic answer because it offers an excellent cure rate (approx. 90%) while maintaining a **superior voice quality** compared to surgical interventions. It treats the entire field without the need for structural tissue removal. **Analysis of Incorrect Options:** * **A. Partial Laryngectomy:** While oncologically sound, it is more invasive than RT or laser surgery and is typically reserved for specific T2 or early T3 lesions where endoscopic options are not feasible. * **B. Total Laryngectomy:** This is the treatment of choice for **Stage IV** (advanced) disease or cases with cartilage destruction. It is far too aggressive for Stage I, as it results in the permanent loss of the natural voice. * **C. Laser Ablation (Transoral Laser Microsurgery):** This is a valid alternative to RT for Stage I. However, if both are options, RT is traditionally highlighted for its functional outcomes in glottic cancer. If the question implies a bulky T1, RT is often preferred. **High-Yield Clinical Pearls for NEET-PG:** * **Stage I & II (Early):** Single modality treatment (RT or Surgery). * **Stage III & IV (Advanced):** Combined modality (Surgery + Post-op RT or Chemoradiotherapy). * **Most common site:** Glottis (vocal cords). Glottic cancers have the best prognosis due to early symptoms (hoarseness) and sparse lymphatic drainage. * **Drug of choice for Chemoradiation:** Cisplatin.

Question 156: Gutzmann's pressure test is done for which of the following conditions?

A. Laryngomalacia
B. Puberphonia (Correct Answer)
C. Laryngeal polyp
D. Vocal cord polyp

Explanation: **Explanation:** **Puberphonia** (Mutational Falsetto) is a functional voice disorder where a post-pubescent male continues to use a high-pitched pre-pubertal voice despite having a normal adult larynx. This occurs because the patient habitually maintains the larynx in an elevated position in the neck, keeping the vocal cords tense and thin. **Gutzmann’s Pressure Test** is the diagnostic clinical test for this condition. During the test, the clinician applies firm backward and downward pressure on the thyroid cartilage while the patient phonates. This maneuver manually lowers the larynx and relaxes the vocal cords, resulting in an immediate drop in vocal pitch to a more masculine, low-frequency tone. If the pitch drops during pressure, the test is positive, confirming the diagnosis. **Analysis of Incorrect Options:** * **Laryngomalacia:** This is a congenital condition causing inspiratory stridor due to floppy supraglottic tissues. Diagnosis is made via flexible laryngoscopy (showing omega-shaped epiglottis), not pressure tests. * **Laryngeal/Vocal Cord Polyp:** These are benign organic lesions causing hoarseness (dysphonia). Diagnosis is confirmed by visualization (indirect or direct laryngoscopy). Pressure tests do not correct the mechanical mass effect of a polyp. **High-Yield Clinical Pearls for NEET-PG:** * **Treatment of choice for Puberphonia:** Voice therapy (specifically **Type A Speech Therapy** or the "Sliding Scale" technique). * **Surgical option:** If therapy fails, **Type III Thyroplasty** (Relaxation Thyroplasty) is performed to shorten and relax the vocal cords. * **Differential:** Always rule out endocrine disorders (hypogonadism) before diagnosing functional puberphonia.

Question 157: What is the approximate width of the glottic chink in the cadaveric position of the vocal cords?

A. 3 mm
B. 3.5 mm
C. 7 mm (Correct Answer)
D. 19 mm

Explanation: ### Explanation The **glottic chink** (rima glottidis) refers to the space between the vocal cords. Its width varies significantly depending on the position of the vocal cords, which is determined by the intrinsic muscles of the larynx and their nerve supply. **Why 7 mm is correct:** The **cadaveric position** is the neutral position assumed by the vocal cords after death or complete paralysis of all laryngeal muscles (total lesion of both Recurrent Laryngeal Nerve and Superior Laryngeal Nerve). In this state, the vocal cords lie midway between the midline and the abducted position. The width of the glottic chink in this position is approximately **7 mm**. **Analysis of Incorrect Options:** * **A & B (3 mm / 3.5 mm):** These values are too narrow for the cadaveric position. A width of approximately **3.5 mm** is seen in the **paramedian position**, which occurs in isolated Recurrent Laryngeal Nerve (RLN) palsy (where the cricothyroid muscle, supplied by the Superior Laryngeal Nerve, remains intact and adducts the cord). * **D (19 mm):** This is far too wide. In **full abduction** (forced inspiration), the glottic chink reaches its maximum width, which is approximately **13–14 mm** in males. 19 mm exceeds the anatomical limits of the adult glottis. **High-Yield Clinical Pearls for NEET-PG:** * **Median Position:** 0 mm (Vocal cords meet in the midline; seen during phonation). * **Paramedian Position:** 3.5 mm (Seen in isolated RLN palsy). * **Cadaveric Position:** 7 mm (Seen in combined RLN and SLN palsy). * **Quiet Respiration:** 13.5 mm (Intermediate position). * **Full Abduction:** 18–19 mm (Total width including the posterior cartilaginous glottis; however, the membranous chink is ~13-14 mm). * **Semon’s Law:** States that in progressive organic lesions of the RLN, the abductor fibers (Posterior Cricoarytenoid) are paralyzed before the adductor fibers.

Question 158: Which muscle is the primary abductor of the vocal cords?

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

Explanation: The vocal cords are controlled by the intrinsic muscles of the larynx, which adjust the tension, length, and position of the vocal folds to facilitate phonation, breathing, and airway protection. **Explanation of the Correct Answer:** The **Posterior Cricoarytenoid (PCA)** is the **only 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 arytenoid cartilages laterally, pulling the vocal processes apart and opening the glottis. Because it is the sole muscle responsible for opening the airway, it is often referred to as the **"Safety Muscle of the Larynx."** **Analysis of Incorrect Options:** * **B. Cricothyroid:** This muscle acts as a **tensor** of the vocal cords. It tilts the cricoid cartilage, increasing the distance between the thyroid and arytenoid cartilages, which elongates the cords and raises the pitch of the voice. It is the only intrinsic muscle supplied by the **External Laryngeal Nerve**. * **C. Interarytenoid:** This muscle (comprising transverse and oblique fibers) is an **adductor**. It pulls the two arytenoid cartilages together, closing the posterior part of the glottis. * **D. Lateral cricoarytenoid:** This is the **primary adductor** of the vocal cords. It rotates the arytenoids medially to close the rima glottidis for phonation. **NEET-PG Clinical Pearls:** * **Nerve Supply:** All intrinsic muscles of the larynx are supplied by the **Recurrent Laryngeal Nerve (RLN)**, *except* the Cricothyroid. * **Bilateral RLN Palsy:** If both RLNs are damaged (e.g., during thyroid surgery), the PCA muscles fail, leading to adducted vocal cords and acute airway obstruction (stridor), often requiring an emergency tracheostomy. * **Semon’s Law:** In progressive RLN injury, abductor fibers (PCA) are more vulnerable and paralyzed earlier than adductor fibers.

Question 159: Facial palsy in Herpes Zoster infection is seen in which syndrome?

A. Ramsay Hunt syndrome (Correct Answer)
B. Meckerson Rosenthal syndrome
C. Sturge Weber syndrome
D. Guillain-Barré syndrome

Explanation: **Explanation:** **Ramsay Hunt Syndrome (Herpes Zoster Oticus)** is caused by the reactivation of the **Varicella Zoster Virus (VZV)** in the **geniculate ganglion** of the facial nerve. It is characterized by a clinical triad: 1. Ipsilateral lower motor neuron (LMN) facial nerve palsy. 2. Otalgia (severe ear pain). 3. Vesicular eruptions in the external auditory canal, concha, or pinna. Because the virus can also involve the vestibulocochlear nerve (CN VIII), patients may present with sensorineural hearing loss and vertigo. **Analysis of Incorrect Options:** * **Melkersson-Rosenthal Syndrome:** A rare neurological disorder characterized by a triad of recurrent facial paralysis, orofacial edema (usually the lips), and a fissured tongue (**Lingua Plicata**). * **Sturge-Weber Syndrome:** A neurocutaneous disorder (phakomatosis) characterized by a **Port-wine stain** (nevus flammeus) on the face, leptomeningeal angiomas, and glaucoma. It does not typically cause facial palsy. * **Guillain-Barré Syndrome:** An acute inflammatory demyelinating polyneuropathy. While it can cause **bilateral** facial nerve palsy, it is an ascending paralysis triggered by an immune response (often post-infection), not direct VZV reactivation. **High-Yield Clinical Pearls for NEET-PG:** * **Prognosis:** Facial palsy in Ramsay Hunt Syndrome is generally more severe and has a poorer recovery rate compared to Bell’s Palsy. * **Treatment:** Combination of oral **Acyclovir** (or Valacyclovir) and **Corticosteroids** started within 72 hours. * **Hitler’s Sign:** Vesicles on the tip of the nose (Hutchinson’s sign) in Herpes Zoster Ophthalmicus indicates involvement of the nasociliary nerve.

Question 160: What is the most common bacterial cause of rhinitis?

A. Haemophilus influenza (Correct Answer)
B. Streptococcus haemolyticus
C. Pasteurella multocida
D. Corynebacterium diphtheriae

Explanation: **Explanation:** The correct answer is **Haemophilus influenzae**. **1. Why Haemophilus influenzae is correct:** Rhinitis is most commonly viral in origin (e.g., Rhinovirus). However, when a secondary bacterial infection occurs or when discussing primary bacterial rhinitis, **Haemophilus influenzae** is the most frequently isolated pathogen. It is a commensal of the upper respiratory tract that becomes pathogenic when the local mucosal immunity is compromised, leading to purulent nasal discharge and mucosal edema. **2. Analysis of Incorrect Options:** * **Streptococcus haemolyticus (Group A Strep):** While a common cause of bacterial pharyngitis and tonsillitis, it is less common than *H. influenzae* as a primary cause of rhinitis. * **Pasteurella multocida:** This is typically associated with infections following animal bites (cats and dogs). It is not a standard pathogen for community-acquired rhinitis. * **Corynebacterium diphtheriae:** This causes Diphtheria, characterized by a greyish-white "pseudomembrane." While it can cause nasal diphtheria (presenting with blood-stained nasal discharge), it is rare due to widespread immunization and is not the "most common" cause. **3. NEET-PG High-Yield Pearls:** * **Most common cause of Acute Rhinitis:** Viruses (Rhinovirus is #1). * **Most common bacterial secondary invader:** *Haemophilus influenzae*, followed by *Streptococcus pneumoniae* and *Moraxella catarrhalis*. * **Clinical Presentation:** Bacterial rhinitis is characterized by a shift from clear/serous discharge to thick, mucopurulent (yellow-green) discharge. * **Nasal Diphtheria:** Always suspect this in a child with excoriation of the nares and a foul-smelling, blood-tinged nasal discharge.

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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