Otolaryngology Basics — MCQs

Otolaryngology Basics Indian Medical PG Practice Questions and MCQs

Question 141: What is the most common cause of facial palsy?

A. Viral infection
B. Bacterial infection
C. Idiopathic (Correct Answer)
D. Trauma

Explanation: **Explanation:** The most common cause of facial nerve palsy is **Bell’s Palsy**, which is defined as an acute, lower motor neuron facial paralysis of **idiopathic** origin. While the reactivation of Herpes Simplex Virus (HSV-1) in the geniculate ganglion is strongly suspected as the underlying pathophysiology, in clinical practice and standard textbooks (like Dhingra), it remains classified as idiopathic because a definitive cause is not identified in the majority of cases. It accounts for approximately 60–75% of all unilateral facial paralysis cases. **Analysis of Incorrect Options:** * **Viral infection:** While viruses (HSV, VZV) are likely triggers, "Idiopathic" is the preferred terminology for the most common clinical entity (Bell’s Palsy). Ramsay Hunt Syndrome (Herpes Zoster Oticus) is the second most common viral cause but is far less frequent than Bell's. * **Bacterial infection:** Causes like Acute Otitis Media (AOM) or Cholesteatoma are significant but statistically less common than idiopathic cases. * **Trauma:** Longitudinal or transverse temporal bone fractures are common causes of *post-traumatic* palsy, but they do not exceed the incidence of Bell’s Palsy in the general population. **Clinical Pearls for NEET-PG:** * **Bell’s Palsy:** Characterized by sudden onset, unilateral LMN palsy. Treatment involves **Steroids** (Prednisolone) started within 72 hours. * **House-Brackmann Scale:** Used to grade the severity of facial nerve palsy (Grade I is normal; Grade VI is total paralysis). * **Schirmer’s Test:** Used to localize the lesion; if reduced lacrimation is present, the lesion is at or proximal to the geniculate ganglion (Greater Superficial Petrosal Nerve). * **Most common site of injury:** The **Labyrinthine segment** is the narrowest part of the fallopian canal, making it the most common site for inflammatory edema and compression.

Question 142: A child presents with stridor, barking cough, and difficulty in breathing for 2-3 days. The child has a fever and an elevated leukocyte count. Which of the following statements about this condition is FALSE?

A. Subglottic stenosis and hypopharyngeal dilatation may be seen on x-rays.
B. Boys are more commonly affected than girls.
C. Symptoms are predominantly caused by involvement of the subglottis.
D. Antibiotics form the mainstay of treatment. (Correct Answer)

Explanation: ### **Explanation** The clinical presentation of stridor, barking cough, and fever in a child is characteristic of **Laryngotracheobronchitis (Croup)**. **Why Option D is the Correct (False) Statement:** Croup is primarily caused by a **viral infection**, most commonly the **Parainfluenza virus (Type 1 & 2)**. Since the etiology is viral, **antibiotics are not the mainstay of treatment**. Management focuses on maintaining the airway and reducing inflammation using **nebulized adrenaline** (for rapid vasoconstriction) and **corticosteroids** (like Dexamethasone) to reduce subglottic edema. Antibiotics are only indicated if a secondary bacterial infection is suspected. **Analysis of Incorrect Options:** * **Option A:** On an AP view X-ray of the neck, subglottic narrowing creates the classic **"Steeple Sign."** Due to the narrowing, the hypopharynx often appears dilated on the lateral view as the child tries to compensate for the obstruction. * **Option B:** Epidemiologically, Croup shows a slight male predilection, affecting **boys more frequently** than girls (approx. 1.5:1 ratio). * **Option C:** The subglottis is the narrowest part of a child's airway. In Croup, the inflammatory edema is most pronounced in the **subglottic region**, leading to the characteristic barking cough and inspiratory stridor. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Parainfluenza virus Type 1. * **Classic X-ray Sign:** Steeple Sign (Subglottic narrowing). * **Age group:** Typically 6 months to 3 years. * **Differential Diagnosis:** **Acute Epiglottitis** (caused by *H. influenzae*), which presents with high fever, drooling, and the **"Thumb Sign"** on X-ray. Unlike Croup, Epiglottitis is a medical emergency where antibiotics *are* part of the mainstay treatment.

Question 143: Maintenance of airway during laryngectomy in a patient with carcinoma of the larynx is best done by which of the following?

A. Tracheostomy (Correct Answer)
B. Laryngeal mask airway
C. Laryngeal tube
D. Combitube

Explanation: **Explanation:** In the surgical management of carcinoma of the larynx (Total Laryngectomy), the primary goal is the complete removal of the larynx, which results in a permanent separation of the digestive and respiratory tracts. **Why Tracheostomy is the Correct Choice:** During a laryngectomy, the larynx is excised, and the distal trachea is brought out to the skin of the neck to create a **permanent end-stoma**. A tracheostomy (specifically, a "low" tracheostomy or a per-operative tracheal intubation through a stoma) is the only definitive way to maintain a secure airway once the upper airway (larynx) is removed. It ensures bypass of the surgical site, prevents aspiration of blood/secretions, and allows the surgeon to work unimpeded in the neck. **Why Other Options are Incorrect:** * **Laryngeal Mask Airway (LMA):** This is a supraglottic airway device that sits above the vocal cords. Since the larynx is being surgically removed, an LMA cannot maintain an airway and would obstruct the surgical field. * **Laryngeal Tube:** Similar to the LMA, this is a supraglottic device. It is contraindicated in laryngeal surgery as it occupies the space that needs to be dissected. * **Combitube:** This is a double-lumen emergency airway device usually inserted blindly. It is entirely inappropriate for elective major head and neck surgery where a secure, definitive airway is required. **Clinical Pearls for NEET-PG:** * **Total Laryngectomy** results in a **permanent tracheostome**; the patient becomes a "total neck breather." * In cases of laryngeal mass with impending airway obstruction, a **"high" tracheostomy** is avoided to prevent tumor seeding (stomal recurrence). * **Post-laryngectomy:** The patient can no longer perform the Valsalva maneuver effectively due to the loss of the glottic closure reflex.

Question 144: Crocodile tears are seen in:

A. Frey's Syndrome
B. Conjunctivitis
C. Lacrimal tumour
D. Abnormal VII nerve regeneration (Correct Answer)

Explanation: ### Explanation **Crocodile Tears (Bogorad’s Syndrome)** is a phenomenon characterized by inappropriate lacrimation while eating or smelling food. **1. Why the Correct Answer is Right:** The condition is caused by **abnormal (synkinetic) regeneration of the Facial Nerve (VII)**, typically following an injury proximal to the geniculate ganglion (e.g., Bell’s palsy or temporal bone fractures). During the recovery phase, parasympathetic secretomotor fibers originally destined for the **salivary glands** (via the chorda tympani and lesser petrosal nerves) are misdirected. They grow along the pathway of the **greater petrosal nerve** to reach the **lacrimal gland**. Consequently, a gustatory stimulus that should trigger salivation instead triggers tearing. **2. Analysis of Incorrect Options:** * **Frey’s Syndrome:** This involves misdirected regeneration of the **Auriculotemporal nerve** (a branch of V3) following parotid surgery. It results in **gustatory sweating** and flushing of the skin over the parotid area, not tearing. * **Conjunctivitis:** This is an inflammatory or infectious condition of the conjunctiva leading to reflex tearing due to irritation, not a neurological miswiring. * **Lacrimal Tumour:** These typically present with a painless swelling in the upper outer quadrant of the orbit, proptosis, or mechanical epiphora (overflow of tears) due to duct obstruction, rather than gustatory lacrimation. **3. High-Yield Clinical Pearls for NEET-PG:** * **Site of Lesion:** Crocodile tears indicate the facial nerve lesion is at or proximal to the **Geniculate Ganglion**. * **Treatment:** The gold standard for symptomatic relief is the injection of **Botulinum toxin (Botox)** into the lacrimal gland. * **Comparison:** Remember: **Frey’s = Sweating** (Auriculotemporal n.); **Crocodile Tears = Lacrimation** (Facial n.).

Question 145: The greater cornu of the hyoid bone is derived from which branchial arch?

A. First
B. Second
C. Third (Correct Answer)
D. Fourth

Explanation: ### Explanation The hyoid bone is a unique structure derived from two different branchial (pharyngeal) arches. Its development is a high-yield topic in embryology and ENT. **Why the Third Arch is Correct:** The **Third Branchial Arch** (mesoderm) gives rise to the **greater cornu** (greater horn) and the **lower part of the body** of the hyoid bone. The associated nerve for this arch is the Glossopharyngeal nerve (CN IX). **Analysis of Incorrect Options:** * **First Arch (Meckel’s Cartilage):** Gives rise to the malleus, incus, mandible, and sphenomandibular ligament. It does not contribute to the hyoid bone. * **Second Arch (Reichert’s Cartilage):** Gives rise to the **lesser cornu** and the **upper part of the body** of the hyoid bone, as well as the stapes, styloid process, and stylohyoid ligament. * **Fourth Arch:** Contributes to the laryngeal cartilages (specifically the thyroid cartilage) and the epiglottis, but not the hyoid bone. **NEET-PG Clinical Pearls:** 1. **The Hyoid Split:** Remember that the hyoid bone is "split" between the 2nd and 3rd arches. * **2nd Arch:** Lesser cornu + Upper body. * **3rd Arch:** Greater cornu + Lower body. 2. **Mnemonic:** "Greater is later" — the 3rd arch (later arch) forms the greater cornu. 3. **Surgical Significance:** The greater cornu is a vital surgical landmark for locating the **Lingual artery** (which lies deep to the hyoglossus muscle at this level) and the **Superior laryngeal nerve**. 4. **Fracture:** A fractured hyoid bone is a classic post-mortem finding in cases of manual strangulation/throttling.

Question 146: Tubercular laryngitis primarily affects which part of the larynx?

A. Anterior commissure
B. Posterior commissure of the larynx (Correct Answer)
C. Anywhere within the larynx
D. Superior surface of the larynx

Explanation: **Explanation:** **1. Why the Posterior Commissure is Correct:** Tubercular laryngitis is almost always secondary to pulmonary tuberculosis. The infection reaches the larynx via **infected sputum** (bronchogenic spread). When a patient is in a recumbent or supine position, the infected sputum tends to pool in the posterior part of the larynx due to gravity. Consequently, the **posterior commissure**, interarytenoid fold, and the posterior parts of the vocal cords are the most frequently involved sites. This results in the classic "mammillated" (granular) appearance of the posterior glottis. **2. Analysis of Incorrect Options:** * **Option A (Anterior commissure):** This site is more commonly associated with early-stage laryngeal carcinoma or web formation. In tuberculosis, the anterior part is usually spared until the disease becomes extensive. * **Option C (Anywhere within the larynx):** While TB can eventually involve the entire larynx (pancorditis), it has a distinct predilection for the posterior segment in its initial and classic presentation. * **Option D (Superior surface):** This is a non-specific anatomical description. TB specifically targets the mucosal surfaces of the glottic and supraglottic regions, particularly where sputum stagnates. **3. Clinical Pearls for NEET-PG:** * **Classic Presentation:** A patient with known pulmonary TB presenting with **hoarseness of voice** and **odynophagia** (painful swallowing). * **Pain:** The pain in TB laryngitis is often described as "exquisite" and may radiate to the ear (referred otalgia). * **Appearance:** Look for "mouse-nibbled" ulcers on the vocal cords or a "turban-shaped" epiglottis (due to massive edema). * **Diagnosis:** Sputum for AFB and Chest X-ray are mandatory. * **Differential:** Must be differentiated from Laryngeal Malignancy; however, malignancy typically involves the anterior two-thirds of the vocal cords, whereas TB involves the posterior third.

Question 147: What is the most common cause of laryngeal stridor in a 60-year-old male?

A. Nasopharyngeal carcinoma
B. Acute severe asthma
C. Carcinoma of the larynx (Correct Answer)
D. Reinke's edema

Explanation: **Explanation:** The correct answer is **Carcinoma of the larynx**. In an elderly male (60 years old), any new-onset laryngeal symptom—particularly stridor or persistent hoarseness—must be considered a malignancy until proven otherwise. Stridor indicates a significant narrowing of the airway (usually >50% obstruction). Squamous cell carcinoma is the most common laryngeal malignancy and typically presents in this age group, often associated with a history of smoking and alcohol consumption. **Analysis of Incorrect Options:** * **Nasopharyngeal Carcinoma:** While common in certain demographics, it typically presents with a neck mass (level II lymph nodes), nasal obstruction, or serous otitis media. It does not primarily cause laryngeal stridor unless there is massive inferior extension or cranial nerve palsy affecting the vocal cords. * **Acute Severe Asthma:** This presents with expiratory wheezing rather than inspiratory stridor. While it causes respiratory distress, the pathology is in the lower airways (bronchioles), not the larynx. * **Reinke’s Edema:** This involves fluid accumulation in the subepithelial space of the vocal cords. While it causes a "low-pitched, gravelly voice," it rarely progresses to the point of causing acute stridor unless the edema is massive and bilateral. **Clinical Pearls for NEET-PG:** * **Age-related Stridor:** In neonates, the most common cause is **Laryngomalacia**. In children, it is often **Croup (Laryngotracheobronchitis)** or foreign body aspiration. In elderly patients, **Malignancy** is the top differential. * **Stridor Types:** * *Inspiratory:* Supraglottic/Glottic lesion. * *Biphasic:* Subglottic lesion. * *Expiratory:* Tracheal/Bronchial lesion. * **Rule of Thumb:** Any patient with hoarseness for more than 3 weeks requires a mandatory indirect laryngoscopy (IDL) or fiberoptic laryngoscopy to rule out carcinoma.

Question 148: Cavernous sinus thrombosis is due to infection of which of the following structures?

A. Pterygoid plexus (Correct Answer)
B. Submental space
C. Maxillary sinus
D. Submandibular space

Explanation: **Explanation:** **Cavernous Sinus Thrombosis (CST)** is a life-threatening condition typically resulting from the retrograde spread of infection from the "danger area" of the face and the infratemporal fossa. **Why Option A is Correct:** The **Pterygoid Plexus** of veins is located in the infratemporal fossa. It communicates with the cavernous sinus via **emissary veins** (passing through the foramen ovale and foramen lacerum) and with the facial vein via the deep facial vein. Crucially, these veins are **valveless**, allowing blood to flow in a retrograde direction. Infections from the teeth (especially maxillary molars) or the deep face can travel through the pterygoid plexus directly into the cavernous sinus, leading to septic thrombosis. **Why Other Options are Incorrect:** * **B & D (Submental and Submandibular spaces):** These spaces are involved in **Ludwig’s Angina**. While they can cause severe airway compromise, they do not have a direct, high-risk venous pathway to the cavernous sinus. * **C (Maxillary Sinus):** While sinusitis can occasionally lead to intracranial complications, the **ethmoid and sphenoid sinuses** are much more common culprits for CST due to their direct anatomical proximity to the cavernous sinus. **High-Yield Clinical Pearls for NEET-PG:** * **Danger Area of Face:** Bound by the nasal bridge and the corners of the mouth; drained by the facial vein which communicates with the cavernous sinus via the **superior ophthalmic vein**. * **Clinical Triad:** Chemosis (conjunctival edema), proptosis, and cranial nerve palsies (III, IV, V1, V2, and VI). * **First Sign:** The **6th Cranial Nerve (Abducens)** is usually the first affected because it runs centrally through the sinus, rather than in the lateral wall. * **Mortality:** High; requires urgent IV antibiotics and management of the primary source of infection.

Question 149: Which of the following blood vessels does not participate in the anastomosis on the nasal septum?

A. Sphenopalatine artery
B. Superior labial artery
C. Posterior ethmoidal artery (Correct Answer)
D. Greater palatine artery

Explanation: The question refers to **Little’s Area** (located in the anteroinferior part of the nasal septum), which is the most common site for epistaxis. This area contains a rich vascular network known as **Kiesselbach’s Plexus**. ### Why the Posterior Ethmoidal Artery is Correct The **Posterior ethmoidal artery** does not contribute to Kiesselbach’s plexus. It supplies the superior turbinate and the upper part of the nasal septum but remains posterior to Little's area. In contrast, the **Anterior ethmoidal artery** is a key component of the plexus. ### Analysis of Other Options The four arteries that form Kiesselbach’s Plexus are: * **Sphenopalatine Artery (Option A):** A branch of the Maxillary artery; it is the "Artery of Epistaxis." * **Superior Labial Artery (Option B):** A branch of the Facial artery; its septal branch enters the plexus. * **Greater Palatine Artery (Option D):** A branch of the Maxillary artery that reaches the septum via the incisive canal. * **Anterior Ethmoidal Artery:** A branch of the Ophthalmic artery (Internal Carotid system). ### High-Yield Clinical Pearls for NEET-PG * **Woodruff’s Plexus:** Located at the posterior end of the middle turbinate/inferior meatus. It is the site for **posterior epistaxis** and is primarily formed by the Sphenopalatine artery. * **Dual Supply:** Little’s area is a site of anastomosis between the **Internal Carotid Artery** (via ethmoidal branches) and the **External Carotid Artery** (via facial and maxillary branches). * **Management:** Anterior epistaxis is usually managed by chemical cautery (Silver Nitrate) or anterior nasal packing, whereas posterior epistaxis may require posterior packing or arterial ligation.

Question 150: Key nob appearance is seen in which of the following conditions?

A. Functional aphonia
B. Puberphonia
C. Phonasthenia (Correct Answer)
D. Vocal cord paralysis

Explanation: **Explanation:** **Phonasthenia** (also known as muscle tension dysphonia or vocal fatigue) is a condition characterized by weakness of the voice due to fatigue of the laryngeal muscles, particularly the **thyroarytenoid** and **interarytenoid** muscles. The characteristic **"Keyhole" appearance** (or Key-nob appearance) occurs during phonation. Due to the weakness of the interarytenoid muscle, the posterior part of the glottis fails to close completely, while the anterior part closes normally. This results in a triangular gap posteriorly and a linear gap anteriorly, resembling an old-fashioned keyhole. **Analysis of Incorrect Options:** * **Functional Aphonia:** Typically presents with a **"rectangular" or "oval" gap** during phonation because the vocal cords fail to adduct to the midline despite normal coughing (which proves physiological integrity). * **Puberphonia:** Characterized by a high-pitched voice in males post-puberty. On laryngoscopy, the vocal cords appear tense and thin, often with a **"mutational chink"** (posterior gap), but not the classic keyhole shape. * **Vocal Cord Paralysis:** Presents with the vocal cord fixed in a specific position (e.g., paramedian). The glottic gap is usually asymmetrical or longitudinal, depending on the nerve involved. **High-Yield Clinical Pearls for NEET-PG:** * **Phonasthenia** is common in professional voice users (teachers, singers). * **Bow-shaped (Bowing) of vocal cords:** Seen in Presbyphonia (aging) or Superior Laryngeal Nerve palsy. * **Hourglass appearance:** Seen in Vocal Nodules (Singer’s nodes) due to the contact of nodules at the junction of the anterior 1/3 and posterior 2/3 of the cords. * **Treatment for Phonasthenia:** Primarily involves voice rest and speech therapy; surgery is rarely indicated.

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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