Otolaryngology Basics — MCQs

Otolaryngology Basics Indian Medical PG Practice Questions and MCQs

Question 51: A patient with Pancoast's tumour develops loss of voice after radiation. What is the most likely cause?

A. Vocal cord infiltration with secondary effects
B. Involvement of the recurrent laryngeal nerve (Correct Answer)
C. Direct irradiation to vocal cords
D. Radiation stenosis of the larynx

Explanation: ### Explanation **Correct Option: B. Involvement of the recurrent laryngeal nerve** **The Medical Concept:** A Pancoast tumor (Superior Sulcus Tumor) is a bronchogenic carcinoma located at the apex of the lung. The **Left Recurrent Laryngeal Nerve (RLN)** has a long intrathoracic course, looping under the arch of the aorta. In the context of apical lung tumors, the nerve is frequently involved either by direct tumor infiltration or by the development of **post-radiation fibrosis**. Radiation therapy induces scarring and fibrotic changes in the mediastinum and apex, which can compress or entrap the RLN, leading to vocal cord paralysis and subsequent hoarseness or loss of voice. **Analysis of Incorrect Options:** * **A. Vocal cord infiltration:** Pancoast tumors are located at the lung apex. Direct infiltration of the vocal cords is anatomically impossible as they are located superiorly in the larynx. * **C. Direct irradiation to vocal cords:** Radiation for a Pancoast tumor is targeted at the lung apex and superior mediastinum. The larynx is typically outside the primary radiation field for this pathology. * **D. Radiation stenosis of the larynx:** While radiation to the neck (e.g., for laryngeal cancer) can cause stenosis, it is not a complication of treating a lung apex tumor. **NEET-PG High-Yield Pearls:** * **Anatomy:** The **Left RLN** is more commonly involved in thoracic pathologies (aortic aneurysm, lung cancer) due to its lower loop around the aorta. The **Right RLN** loops around the subclavian artery. * **Pancoast Syndrome:** Classically presents with Horner’s syndrome (miosis, ptosis, anhidrosis) due to involvement of the sympathetic chain (stellate ganglion) and pain in the C8-T2 distribution. * **Ortner’s Syndrome:** Hoarseness caused by Left RLN compression due to a dilated left atrium (mitral stenosis).

Question 52: Which of the following conditions is considered life-threatening?

A. Unilateral adductor paralysis
B. Unilateral abductor paralysis
C. Bilateral adductor paralysis
D. Bilateral abductor paralysis (Correct Answer)

Explanation: **Explanation:** The core concept in laryngeal paralysis is the position of the vocal cords and its impact on the airway. The **abductor muscles** (specifically the Posterior Cricoarytenoid) are responsible for opening the glottis for breathing. **1. Why Bilateral Abductor Paralysis is Life-Threatening:** In this condition, both vocal cords are paralyzed in the **median or paramedian position**. Because the muscles that open the airway are non-functional, the cords remain closed or sucked together during inspiration (Bernoulli effect). This leads to severe **inspiratory stridor** and acute airway obstruction, necessitating an emergency tracheostomy or intubation to prevent asphyxia. **2. Analysis of Incorrect Options:** * **Unilateral Adductor Paralysis:** The affected cord cannot meet the midline. This results in a weak, breathy voice and potential aspiration, but the airway remains patent. * **Unilateral Abductor Paralysis:** One cord is fixed in the midline. While the voice may be hoarse, the other cord can still abduct sufficiently to maintain an adequate airway for normal activities. * **Bilateral Adductor Paralysis:** Both cords fail to meet in the midline (staying in the cadaveric position). While this causes total aphonia (loss of voice) and a high risk of aspiration, the airway is widely open, so it is not an immediate respiratory emergency. **Clinical Pearls for NEET-PG:** * **Posterior Cricoarytenoid (PCA):** The only abductor of the vocal cords ("Safety muscle of the larynx"). * **Semon’s Law:** States that in progressive lesions of the recurrent laryngeal nerve, abductor fibers are injured first, followed by adductor fibers. * **Wagner and Grossman Hypothesis:** Suggests that if the Superior Laryngeal Nerve is intact, the cricothyroid muscle keeps the paralyzed cord in the paramedian position. * **Management:** For bilateral abductor paralysis, the immediate treatment is tracheostomy; long-term options include lateralization of the cord (Kashima’s procedure or Woodman’s operation).

Question 53: Which laser is used in laryngeal work?

A. Argon
B. Nd:Yag
C. Holmium
D. CO2 (Correct Answer)

Explanation: **Explanation:** The **CO2 (Carbon Dioxide) laser** is the gold standard and most commonly used laser in laryngeal surgery. Its wavelength (10,600 nm) is highly absorbed by water, which constitutes the majority of soft tissue. This results in **excellent precision, minimal peripheral thermal damage (0.1 mm), and superior hemostasis** for small vessels. In laryngeal work, it is used for procedures like cordectomy, papilloma excision, and treating subglottic stenosis because it allows for "what you see is what you get" surgical accuracy, preserving the delicate vocal cord architecture. **Analysis of Incorrect Options:** * **Argon Laser:** Primarily used in otology (e.g., stapedotomy) and ophthalmology. It is absorbed by pigment (hemoglobin/melanin) rather than water, making it less ideal for general laryngeal tissue ablation. * **Nd:YAG Laser:** It has deep tissue penetration (up to 4-5 mm), which causes significant collateral thermal damage. While used for debulking large obstructing tracheobronchial tumors, it lacks the precision required for delicate laryngeal surgery. * **Holmium Laser:** Mainly used in urology (lithotripsy) and orthopedic surgery. It is rarely used in the larynx due to its pulsed nature and less predictable tissue interaction compared to CO2. **High-Yield Clinical Pearls for NEET-PG:** * **KTP (Potassium Titanyl Phosphate) Laser:** Known as the "vascular laser," it is excellent for angiolytic work (e.g., vocal cord varices or papillomas) as it is absorbed by hemoglobin. * **Safety Protocol:** When using CO2 lasers in the airway, **Laser-safe endotracheal tubes** (e.g., Mallinckrodt or Medtronic) must be used, and the cuff should be filled with **saline dyed with methylene blue** to detect accidental perforation immediately. * **Mode of Delivery:** CO2 lasers are typically delivered via a micromanipulator attached to an operating microscope.

Question 54: Reinke's space is seen in which of the following anatomical locations?

A. Vocal cords (Correct Answer)
B. Subglottis
C. Epiglottis
D. Pharynx

Explanation: **Explanation:** **Reinke’s space** is a potential subepithelial space located in the **vocal cords** (specifically the true vocal folds). It is situated between the overlying non-keratinizing squamous epithelium and the underlying vocal ligament. 1. **Why Vocal Cords are correct:** Reinke’s space contains loose areolar tissue and lacks lymphatic drainage. This anatomical peculiarity is why fluid accumulation occurs easily here, leading to **Reinke’s Edema**. This space is bounded superiorly and inferiorly by the line of arcuate and anteriorly by the anterior commissure. 2. **Why other options are incorrect:** * **Subglottis:** This region starts below the vocal folds. It is characterized by respiratory epithelium and does not contain the specific loose connective tissue layer of Reinke. * **Epiglottis:** The epiglottis consists of elastic cartilage covered by a mucous membrane; it does not possess the specialized layered architecture of the true vocal folds. * **Pharynx:** The pharyngeal walls consist of mucosa, submucosa, and muscle layers, lacking the distinct "space" required for vocal fold vibration. **Clinical Pearls for NEET-PG:** * **Reinke’s Edema:** Characteristically seen in **chronic smokers** and those with **vocal abuse**. It presents with a low-pitched, gravelly voice. * **Lymphatics:** Reinke’s space has **no lymphatics**, which is why early glottic (vocal cord) cancers have an excellent prognosis as they do not spread to lymph nodes early. * **Histology:** The vocal fold has five layers. Reinke’s space corresponds to the **superficial layer of the lamina propria**.

Question 55: Which nerve is most commonly affected in stylalgia?

A. Glossopharyngeal nerve (Correct Answer)
B. Abducent nerve
C. Auditory nerve
D. Greater Petrosal nerve

Explanation: **Explanation:** **Stylalgia**, also known as **Eagle’s Syndrome**, refers to facial or pharyngeal pain caused by an elongated styloid process (greater than 30 mm) or calcification of the stylohyoid ligament. **Why Glossopharyngeal Nerve is Correct:** The styloid process is located in close anatomical proximity to several neurovascular structures. The **glossopharyngeal nerve (CN IX)** arches around the lateral aspect of the styloid process as it descends to the base of the tongue. When the process is elongated or deviated medially, it mechanically irritates or compresses the glossopharyngeal nerve. This results in the classic presentation: dull, nagging throat pain, a sensation of a foreign body (globus), and referred otalgia (pain in the ear) triggered by swallowing or turning the head. **Why Other Options are Incorrect:** * **Abducent nerve (CN VI):** This nerve controls the lateral rectus muscle of the eye. It is located intracranially and in the orbit, far from the styloid process. * **Auditory nerve (CN VIII):** This nerve is responsible for hearing and balance and is contained within the internal auditory canal and inner ear. * **Greater Petrosal nerve:** A branch of the facial nerve (CN VII) involved in parasympathetic lacrimation; it is located deep within the temporal bone and does not interact with the styloid process. **Clinical Pearls for NEET-PG:** * **Diagnosis:** Confirmed by palpating the styloid process in the tonsillar fossa (which reproduces the pain) and imaging (X-ray or 3D CT). * **Treatment:** Medical management includes NSAIDs or carbamazepine; definitive treatment is **styloidectomy** (trans-oral or external approach). * **Referred Otalgia:** In stylalgia, ear pain is mediated by the **Jacobson’s nerve**, a branch of the glossopharyngeal nerve.

Question 56: Blood supply of the Eustachian tube is by all except?

A. Ascending pharyngeal artery
B. Middle meningeal artery
C. Artery of pterygoid canal
D. Facial artery (Correct Answer)

Explanation: The **Eustachian tube (ET)** connects the middle ear to the nasopharynx and receives its blood supply from the branches of the **External Carotid Artery** and the **Maxillary Artery**. ### **Explanation of the Correct Answer** **D. Facial artery:** This is the correct answer because it does **not** directly supply the Eustachian tube. While the facial artery supplies the muscles of the face, submandibular gland, and tonsils (via the tonsillar branch), it does not contribute to the vascular network of the ET. ### **Analysis of Incorrect Options** The Eustachian tube is supplied by a network of arteries arising primarily from the Maxillary and Ascending Pharyngeal systems: * **A. Ascending pharyngeal artery:** A branch of the external carotid artery, it provides significant supply to the medial aspect of the tube. * **B. Middle meningeal artery:** A branch of the first part of the maxillary artery; it supplies the ET as it passes through the foramen spinosum. * **C. Artery of pterygoid canal (Vidian artery):** A branch of the third part of the maxillary artery, it supplies the cartilaginous portion of the tube. * *Note:* The **Accessory meningeal artery** also contributes to the supply. ### **NEET-PG High-Yield Pearls** * **Nerve Supply:** The ET is supplied by the **Pharyngeal plexus** (CN IX and X) and the **Tympanic plexus** (CN IX). The sensory supply is primarily via the **Glossopharyngeal nerve (CN IX)** and the **Pharyngeal branch of the Sphenopalatine ganglion (V2)**. * **Muscles:** The **Tensor Veli Palatini** is the main dilator of the tube (the "safety valve"), while the **Levator Veli Palatini** also assists. * **Clinical Correlation:** In children, the ET is shorter, wider, and more horizontal, which explains the higher incidence of **Otitis Media** due to easier reflux of nasopharyngeal secretions.

Question 57: Preauricular pain, grating sensation, and partial trismus are the symptoms of which condition?

A. Temporomandibular joint (TMJ) fibrous ankylosis
B. Temporomandibular joint (TMJ) bony ankylosis
C. Temporomandibular joint (TMJ) pain dysfunction syndrome (Correct Answer)
D. Ear infection

Explanation: **Explanation:** **1. Why Option C is Correct:** Temporomandibular Joint (TMJ) Pain Dysfunction Syndrome (also known as Costen’s Syndrome or Myofascial Pain Dysfunction Syndrome) is a functional disorder rather than a structural one. The classic triad of symptoms includes **preauricular pain** (often referred to the ear), **clicking or grating sensations** (crepitus) during jaw movement, and **partial trismus** (limited mouth opening). The pain is typically exacerbated by chewing or stress and is caused by spasm of the masticatory muscles and incoordination of the intra-articular disc. **2. Why Other Options are Incorrect:** * **Options A & B (TMJ Ankylosis):** Ankylosis involves the fusion of the joint. **Bony ankylosis** presents with a total inability to open the mouth (severe trismus) and an absence of pain or grating because the joint is immobile. **Fibrous ankylosis** allows minimal movement but is generally characterized by a "painless" restriction of motion. * **Option D (Ear Infection):** While otitis externa or media causes ear pain (otalgia), they do not typically present with a grating sensation in the joint or trismus unless there is secondary spread to the infratemporal fossa (e.g., Malignant Otitis Externa). **3. Clinical Pearls for NEET-PG:** * **Referred Otalgia:** TMJ disorders are the most common cause of secondary (referred) otalgia. The nerve involved is the **auriculotemporal nerve** (a branch of V3). * **Management:** Initial treatment is conservative, including soft diet, analgesics (NSAIDs), and warm compresses. * **Differential Diagnosis:** Always rule out Eagle’s Syndrome (elongated styloid process) if the patient also complains of a foreign body sensation in the throat.

Question 58: What is the most widely used treatment for recurrent respiratory papillomatosis?

A. CO2 laser ablation (Correct Answer)
B. Diathermy excision
C. Excision with microdebrider
D. Wait for spontaneous resolution

Explanation: **Explanation:** **Recurrent Respiratory Papillomatosis (RRP)** is a condition caused by Human Papillomavirus (HPV types 6 and 11), characterized by benign wart-like growths in the airway. The primary goal of treatment is to maintain a patent airway and improve voice quality while minimizing scarring. **Why CO2 Laser Ablation is correct:** The **CO2 laser** is considered the gold standard and most widely used treatment. Its wavelength is highly absorbed by water, allowing for precise, bloodless excision with minimal collateral thermal damage. This precision is vital in the larynx to prevent complications like anterior glottic webbing or permanent vocal cord scarring. **Analysis of Incorrect Options:** * **Diathermy excision:** This method involves significant thermal spread, which leads to excessive scarring and stenosis of the delicate laryngeal tissues. It is rarely used today. * **Excision with microdebrider:** While the microdebrider is a popular alternative (often preferred by some surgeons for faster removal and less thermal risk), the **CO2 laser remains the most "widely used" and classically cited** treatment in standard textbooks for NEET-PG. * **Wait for spontaneous resolution:** RRP is aggressive and can cause life-threatening airway obstruction. While juvenile-onset RRP may regress after puberty, active management is mandatory to prevent asphyxia. **High-Yield Clinical Pearls for NEET-PG:** * **Etiology:** HPV 6 (most common) and HPV 11 (more aggressive). * **Most common site:** True vocal cords (squamous epithelium). * **Triad of symptoms:** Hoarseness, stridor, and respiratory distress. * **Adjuvant therapy:** Cidofovir (antiviral) is the most common adjuvant used for severe, rapidly recurring cases. * **Tracheostomy:** Should be avoided if possible, as it can lead to "stomal seeding" and distal spread of the disease into the lungs.

Question 59: High tracheostomy is indicated in diseases of the larynx:

A. Scleroma
B. Tuberculosis
C. Carcinoma (Correct Answer)
D. Multiple papilloma

Explanation: **Explanation:** Tracheostomy is classified based on its relationship to the thyroid isthmus: **High** (above the isthmus, through the 1st or 2nd ring), **Mid** (behind the isthmus), and **Low** (below the isthmus, through the 3rd or 4th ring). **Why Carcinoma is the correct answer:** In cases of **Carcinoma of the Larynx**, a high tracheostomy is specifically indicated when the procedure is performed as a preliminary step to a **Total Laryngectomy**. Since the entire larynx and the upper tracheal rings will eventually be removed during the definitive surgery, the potential long-term complication of a high tracheostomy—**perichondritis of the cricoid cartilage leading to subglottic stenosis**—is irrelevant. The stoma site will be sacrificed during the resection. **Analysis of incorrect options:** * **Scleroma, Tuberculosis, and Multiple Papilloma:** These are inflammatory or benign neoplastic conditions. In these cases, a **Low Tracheostomy** is preferred. A high tracheostomy is strictly avoided here because the proximity to the cricoid cartilage can cause inflammation and subsequent permanent subglottic stenosis, which would be a devastating complication in patients expected to have a functional larynx post-treatment. **NEET-PG Clinical Pearls:** * **Standard Procedure:** In almost all routine clinical scenarios, a **Mid-tracheostomy** is the preferred type. * **Emergency:** In acute airway obstruction where a tracheostomy is too slow, **Cricothyroidotomy** is the procedure of choice. * **High Tracheostomy Danger:** It is generally contraindicated (except in laryngectomy) because it carries a high risk of **Laryngeal Stenosis** due to its proximity to the subglottis. * **Low Tracheostomy:** Preferred in children to avoid damage to the narrow subglottis, though it carries a risk of injury to the innominate artery.

Question 60: A Blom-Singer prosthesis is used:

A. As a ventilation tube in otitis media with effusion
B. To close a perforation in the nasal septum
C. To divert tracheal air into the esophagus for voice production in laryngeal patients (Correct Answer)
D. In stapedectomy to conduct sound from the incus to the oval window

Explanation: **Explanation:** The **Blom-Singer prosthesis** is a one-way indwelling valve used for **Tracheoesophageal Puncture (TEP)** speech restoration following a total laryngectomy. **1. Why the correct answer is right:** In patients who have undergone total laryngectomy, the natural connection between the airway and the food pipe is lost. A surgical shunt (TEP) is created between the posterior wall of the trachea and the anterior wall of the esophagus. The Blom-Singer prosthesis is inserted into this shunt. When the patient occludes their stoma, exhaled air is diverted from the trachea through the valve into the esophagus. This air vibrates the pharyngoesophageal segment (neoglottis), producing sound that is then articulated into speech. The one-way valve mechanism is crucial as it allows air to pass into the esophagus but prevents food or liquid from aspirating into the trachea. **2. Why the incorrect options are wrong:** * **Option A:** Ventilation tubes used in otitis media with effusion are called **Grommets** (e.g., Shepard or Reuter Bobbin). * **Option B:** Nasal septal perforations are managed with **Septal Buttons** (usually made of silicone). * **Option C:** Prostheses used in stapedectomy to connect the incus to the oval window are called **Stapes Pistons** (e.g., Teflon or Titanium pistons). **3. High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard:** TEP with a prosthesis is currently the gold standard for voice rehabilitation after total laryngectomy. * **Other Voice Options:** Include Esophageal speech (difficult to learn) and Electrolarynx (robotic sound). * **Complication:** The most common reason for prosthesis failure is **fungal colonization** (Candida), which leads to valve leakage. * **Panje Valve:** Another common type of indwelling tracheoesophageal prosthesis similar to Blom-Singer.

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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