Otolaryngology Basics — MCQs

Otolaryngology Basics Indian Medical PG Practice Questions and MCQs

Question 91: Type 1 thyroplasty is indicated for which of the following conditions?

A. Vocal cord shortening
B. Vocal cord lengthening
C. Vocal cord medialization (Correct Answer)
D. Vocal cord lateralization

Explanation: **Explanation:** Thyroplasty, also known as **Isshiki Phonosurgery**, involves modifying the thyroid cartilage to alter the position or tension of the vocal cords without entering the airway. **1. Why Option C is Correct:** **Type 1 Thyroplasty (Medialization)** is the most common type. It is indicated for **unilateral vocal cord paralysis** (where the cord is fixed in an abducted/lateral position) or vocal cord atrophy. By placing a silastic or Gore-Tex wedge lateral to the vocal cord, the paralyzed cord is pushed toward the midline. This allows the healthy cord to make contact during phonation, improving voice quality and preventing aspiration. **2. Why Other Options are Incorrect:** * **Option A (Shortening):** This is **Type 3 Thyroplasty**. It involves removing a vertical strip of cartilage to relax the vocal cords, thereby **lowering the pitch** of the voice (used in Mutational Falsetto/Puberphonia). * **Option B (Lengthening):** This is **Type 4 Thyroplasty**. It involves cricothyroid approximation to increase the tension of the vocal cords, thereby **raising the pitch** of the voice (used in Androphonia or gender-affirming surgery). * **Option D (Lateralization):** This is **Type 2 Thyroplasty**. It is indicated for **Adductor Spasmodic Dysphonia**, where the cords close too tightly. The thyroid cartilage is incised vertically and widened to move the cords apart. **High-Yield Clinical Pearls for NEET-PG:** * **Type 1:** Medialization (for Paralysis) – *Most common.* * **Type 2:** Lateralization (for Spasmodic Dysphonia). * **Type 3:** Relaxation/Shortening (to Lower Pitch). * **Type 4:** Stretching/Tension (to Raise Pitch). * **Key Landmark:** These procedures are performed on the **Thyroid Cartilage**. * **Anesthesia:** Usually performed under **local anesthesia** so the surgeon can monitor the patient's voice quality in real-time to ensure optimal wedge placement.

Question 92: What is the most common cause of stridor in children?

A. Laryngomalacia (Correct Answer)
B. Congenital laryngeal paralysis
C. Foreign body in larynx
D. Congenital laryngeal tumors

Explanation: **Explanation:** **Laryngomalacia** is the most common cause of congenital stridor in infants and the most common congenital anomaly of the larynx. It is characterized by an inward collapse of the supraglottic structures (epiglottis, aryepiglottic folds) during inspiration, leading to a characteristic high-pitched **inspiratory stridor**. The symptoms typically appear within the first two weeks of life, worsen with crying or feeding, and usually resolve spontaneously by 18–24 months as the laryngeal cartilage matures. **Analysis of Incorrect Options:** * **B. Congenital laryngeal paralysis:** This is the second most common cause of congenital stridor. It can be unilateral (often associated with birth trauma or cardiac anomalies) or bilateral (often associated with CNS issues like Arnold-Chiari malformation). * **C. Foreign body in larynx:** While a common cause of *acute* respiratory distress in toddlers, it is not the most common cause overall and typically presents with a sudden onset of choking and cough. * **D. Congenital laryngeal tumors:** These (such as subglottic hemangiomas) are rare. They typically present with progressive stridor and are not as prevalent as laryngomalacia. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Flexible fiberoptic laryngoscopy is the gold standard (shows "Omega-shaped" epiglottis). * **Positioning:** Stridor in laryngomalacia typically **improves in the prone position** and worsens in the supine position. * **Management:** Most cases are managed conservatively. Surgical intervention (**Supraglottoplasty**) is reserved for severe cases with failure to thrive or cor pulmonale.

Question 93: Trismus following a lower molar extraction, presenting after 4 weeks, may be due to which of the following complications?

A. Breakage of needle in the pterygomandibular space (Correct Answer)
B. Hematoma of the temporomandibular joint (TMJ)
C. Abscess in the submasseteric space
D. Retained root stump in the extraction socket

Explanation: ### Explanation **Correct Answer: A. Breakage of needle in the pterygomandibular space** **Why it is correct:** Trismus (lockjaw) following dental extraction is often immediate or acute. However, **delayed trismus** appearing weeks later is a classic sign of a foreign body or chronic irritation in the masticatory spaces. During a lower molar extraction, an **Inferior Alveolar Nerve Block (IANB)** is administered. If the needle breaks, it most commonly lodges in the **pterygomandibular space**. Over time, the needle fragment causes chronic inflammation, fibrosis, or secondary infection of the medial pterygoid muscle, leading to progressive and persistent trismus. **Why the other options are incorrect:** * **B. Hematoma of the TMJ:** A hematoma would cause acute pain and limited opening almost immediately or within 24–48 hours post-trauma/procedure. It would likely resolve or organize much earlier than 4 weeks. * **C. Abscess in the submasseteric space:** While this causes severe trismus, it is an acute pyogenic infection characterized by intense pain, fever, and facial swelling. It typically presents within 3–7 days post-extraction, not as a primary complaint at 4 weeks without prior acute symptoms. * **D. Retained root stump:** This usually leads to localized alveolar osteitis (dry socket) or a localized infection/granuloma. While it causes pain, it rarely results in significant trismus unless it leads to a major fascial space infection. **NEET-PG High-Yield Pearls:** * **Pterygomandibular Space Boundaries:** Lateral (Mandible ramus), Medial (Medial pterygoid muscle), Anterior (Pterygomandibular raphe). * **Contents:** Inferior alveolar nerve, artery, and vein; Lingual nerve. * **Most common cause of needle breakage:** Sudden movement by the patient or using a 30-gauge (thin) needle for IANB. * **Management:** If a needle breaks, it should only be surgically removed if it is symptomatic or migrating, as localization in the pterygomandibular space is surgically challenging.

Question 94: The best way to diagnose laryngomalacia is:

A. Symptoms and signs of disease only
B. Soft tissue lateral view neck
C. Direct laryngoscopy under general anaesthesia
D. Flexible fibreoptic laryngoscopy (Correct Answer)

Explanation: ### Explanation **Laryngomalacia** is the most common congenital anomaly of the larynx and the leading cause of congenital stridor. It is characterized by "floppy" supraglottic structures that collapse inward during inspiration. **Why Option D is Correct:** The gold standard for diagnosis is **Flexible Fibreoptic Laryngoscopy (FFL)** performed while the patient is **awake and breathing spontaneously**. This allows the clinician to observe the dynamic collapse of the supraglottic tissues (such as omega-shaped epiglottis or shortened aryepiglottic folds) in real-time during the respiratory cycle. **Why Other Options are Incorrect:** * **Option A:** While symptoms (inspiratory stridor worsening when supine or crying) are suggestive, they cannot definitively differentiate laryngomalacia from other causes of stridor like vocal cord palsy or subglottic stenosis. * **Option B:** Soft tissue X-rays are useful for detecting radio-opaque foreign bodies or "steeple signs" in croup, but they cannot capture the dynamic soft tissue collapse characteristic of laryngomalacia. * **Option C:** Direct laryngoscopy under General Anaesthesia (GA) often utilizes muscle relaxants or positive pressure ventilation, which can mask the natural dynamic collapse of the airway, leading to a false-negative result. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Presentation:** High-pitched inspiratory stridor that appears at 2–4 weeks of age, worsens in the supine position, and improves when prone. * **Key Findings on FFL:** 1. **Omega-shaped (Ω) epiglottis** (most common). 2. Shortened aryepiglottic folds. 3. Redundant/bulky arytenoid mucosa. * **Management:** Most cases (90%) are self-limiting and resolve by 18–24 months. **Supraglottoplasty** is the surgical treatment of choice for severe cases (e.g., failure to thrive, cor pulmonale, or severe apnea).

Question 95: A cricoid hook is particularly used for which surgical procedure?

A. Thyroidectomy
B. Block dissection of the neck
C. Retracting the superior laryngeal nerve
D. Tracheostomy (Correct Answer)

Explanation: **Explanation:** The **cricoid hook** is a specialized surgical instrument used primarily during **tracheostomy**. Its primary function is to stabilize the larynx and pull the cricoid cartilage superiorly and anteriorly. This maneuver serves two critical purposes: it brings the trachea closer to the skin surface and stabilizes the mobile airway, allowing the surgeon to make a precise incision into the tracheal rings (usually between the 2nd and 3rd or 3rd and 4th rings) without the risk of the trachea shifting. **Analysis of Options:** * **Tracheostomy (Correct):** As described, the hook provides traction and stabilization of the trachea, which is essential for a safe and controlled entry into the airway. * **Thyroidectomy:** While retractors (like Langenbeck or Joll’s) are used, a cricoid hook is not standard as the focus is on lateral retraction of muscles and mobilization of the thyroid gland, not superior traction of the larynx. * **Block dissection of the neck:** This procedure involves the removal of lymph nodes and fibrofatty tissue. It requires wide-field retractors (like Morris or Deaver) rather than a small, sharp hook designed for cartilaginous stabilization. * **Retracting the superior laryngeal nerve:** This is a delicate neural structure. Using a sharp cricoid hook would cause permanent nerve damage. Nerve protectors or fine blunt dissectors are used instead. **Clinical Pearls for NEET-PG:** * **The "Safety" Rule:** During tracheostomy, the cricoid hook should be held by the assistant to maintain the midline position. * **High-Yield Landmark:** The cricoid cartilage is the only complete cartilaginous ring in the airway and serves as the landmark for the 1st tracheal ring immediately below it. * **Complication:** Improper use of the hook can lead to accidental puncture of the subglottic space or trauma to the cricoid itself, potentially leading to subglottic stenosis.

Question 96: Which of the following statements is NOT true regarding the development and reconstruction of the pinna?

A. The pinna develops from the first pharyngeal arch hillocks of His.
B. The tragus is formed from the first pharyngeal arch hillock.
C. Costal cartilage is used as a graft in the surgical treatment of anotia.
D. Reconstruction of the pinna in anotia is optimally performed within 1 year of age. (Correct Answer)

Explanation: **Explanation:** **1. Why Option D is the Correct Answer (The False Statement):** Reconstruction of the pinna in cases of anotia or microtia is **not** performed at 1 year of age. The optimal age for surgical reconstruction is typically **6 to 10 years**. This delay is necessary for two reasons: * **Cartilage Volume:** By age 6, the costal (rib) cartilage is sufficiently developed to provide enough material for carving a framework. * **Growth:** The pinna reaches approximately 85-90% of its adult size by age 6, allowing the surgeon to match the reconstructed ear to the eventual size of the contralateral normal ear. **2. Analysis of Other Options:** * **Option A & B:** The pinna develops from **six branchial hillocks (Hillocks of His)**. Hillocks 1, 2, and 3 arise from the **1st branchial arch (Mandibular)**, while 4, 5, and 6 arise from the **2nd branchial arch (Hyoid)**. Specifically, the **tragus** is the only major structure derived from the **1st hillock** (1st arch). * **Option C:** Autologous **costal cartilage** (usually from the 6th, 7th, and 8th ribs) remains the gold standard graft material for creating the structural framework in total ear reconstruction (e.g., Brent or Nagata techniques). **Clinical Pearls for NEET-PG:** * **Developmental Source:** 1st Arch → Tragus; 2nd Arch → Helix, Antihelix, Antitragus, and Lobule. * **Nerve Supply:** The pinna has a complex nerve supply (Greater auricular, Lesser occipital, Auriculotemporal, and Arnold’s nerve). * **Preauricular Sinus:** Caused by the failure of fusion of the 1st and 2nd arch hillocks. * **First structure to develop:** The primitive otocyst (inner ear) appears before the external ear.

Question 97: What is the most common cause of lower motor neuron facial palsy?

A. Cholesteatoma
B. Cerebello-pontine angle tumors
C. Bell's palsy (Correct Answer)
D. Postoperative (ear surgery)

Explanation: **Explanation:** **1. Why Bell’s Palsy is Correct:** Bell’s palsy is an idiopathic, acute-onset lower motor neuron (LMN) facial nerve paralysis. It is the **most common cause** of isolated facial palsy worldwide, accounting for approximately 60–75% of all cases. Pathophysiologically, it is believed to be caused by viral-induced (often HSV-1) inflammation and edema of the facial nerve within the narrow fallopian canal, leading to nerve compression and ischemia. **2. Analysis of Incorrect Options:** * **A. Cholesteatoma:** While a common cause of facial nerve palsy in patients with Chronic Suppurative Otitis Media (CSOM), it is far less frequent than Bell's palsy. It causes palsy via direct pressure or inflammatory erosion of the bony canal. * **B. Cerebello-pontine (CP) angle tumors:** Tumors like Acoustic Neuroma (Vestibular Schwannoma) can cause LMN facial palsy, but they typically present with associated symptoms like sensorineural hearing loss and tinnitus. They are a much rarer cause than idiopathic palsy. * **C. Postoperative (ear surgery):** Iatrogenic injury is a significant concern during mastoidectomy or stapedectomy, but with modern surgical techniques and monitoring, it remains a complication rather than the leading cause in the general population. **3. Clinical Pearls for NEET-PG:** * **Diagnosis of Exclusion:** Bell’s palsy is diagnosed only after excluding middle ear pathology, trauma, and tumors. * **House-Brackmann Scale:** Used to grade the severity of facial nerve palsy (Grade I is normal; Grade VI is total paralysis). * **Management:** The mainstay of treatment is **Oral Corticosteroids** (e.g., Prednisolone), which should ideally be started within 72 hours of onset. Antivirals (Acyclovir) may be added in severe cases. * **Topognostic Tests:** Schirmer’s test, Stapedial reflex, and Taste sensation help localize the site of the lesion along the nerve's course.

Question 98: A patient presents with carcinoma of the larynx. Which of the following sites is most likely to harbor a synchronous second primary malignancy?

A. Cancer of the base of the tongue
B. Cancer of the esophagus
C. Carcinoma of the bronchus (Correct Answer)
D. Carcinoma of the nasopharynx

Explanation: **Explanation:** The occurrence of synchronous or metachronous tumors in the upper aerodigestive tract is explained by the concept of **"Field Cancerization."** This theory suggests that large areas of mucous membranes are pre-conditioned by prolonged exposure to common carcinogens (primarily tobacco and alcohol), making the entire tract susceptible to multiple independent primary malignancies. **Why Carcinoma of the Bronchus is Correct:** In patients with laryngeal carcinoma, the most common site for a synchronous second primary malignancy is the **bronchus (lung)**. Both the larynx and the lungs share the same respiratory epithelium and are exposed to the same inhaled carcinogens (tobacco smoke). Statistically, the lung is the most frequent site for second primaries in head and neck cancer patients, followed by the esophagus. **Analysis of Incorrect Options:** * **A. Base of Tongue:** While part of the "field," it is less frequently involved as a synchronous site compared to the lower respiratory tract. * **B. Esophagus:** This is the second most common site for synchronous tumors in laryngeal cancer patients (due to the "swallowed" carcinogens), but it ranks lower than the bronchus. * **D. Nasopharynx:** Nasopharyngeal carcinoma is more strongly associated with EBV infection and genetic factors rather than the field cancerization effect seen with tobacco-related laryngeal cancers. **High-Yield Clinical Pearls for NEET-PG:** * **Definition:** *Synchronous* tumors are diagnosed at the same time or within 6 months of the index tumor. *Metachronous* tumors are diagnosed more than 6 months later. * **Slaughter’s Hypothesis:** The formal name for the "Field Cancerization" theory (1953). * **Screening:** Because of this high risk, a "triple endoscopy" (panendoscopy)—consisting of laryngoscopy, esophagoscopy, and bronchoscopy—was traditionally recommended for the workup of head and neck cancers.

Question 99: What is not characteristic of Eagle's syndrome?

A. Excessive lacrimation (Correct Answer)
B. Pain during mandibular movement
C. Stabbing type pain originating in the tonsillar regions
D. Pain subsides when the jaws are closed

Explanation: **Explanation:** **Eagle’s Syndrome** (also known as Stylohyoid Syndrome) is caused by an **elongated styloid process** (greater than 3 cm) or calcification of the stylohyoid ligament. This anatomical variation leads to the compression of nearby neurovascular structures, primarily the glossopharyngeal nerve (CN IX) and the carotid arteries. **Why "Excessive lacrimation" is the correct answer:** Eagle’s syndrome typically presents with sensory and pain-related symptoms rather than autonomic dysfunction of the lacrimal gland. Lacrimation is controlled by the facial nerve (CN VII) via the greater petrosal nerve. While Eagle’s syndrome involves the tonsillar fossa and neck, it does not typically involve the autonomic pathways responsible for tearing. **Analysis of Incorrect Options:** * **B & D (Mandibular movement/Jaw closure):** Pain in Eagle’s syndrome is often triggered or exacerbated by movements of the head and jaw, such as swallowing, turning the neck, or opening the mouth wide, as these actions cause the elongated process to irritate the surrounding soft tissues and nerves. * **C (Stabbing pain in tonsillar region):** This is a hallmark symptom. The styloid process lies in close proximity to the tonsillar fossa. Irritation of the glossopharyngeal nerve leads to referred pain in the throat and ear (otalgia), often described as a sharp, stabbing sensation. **NEET-PG High-Yield Pearls:** * **Classic Presentation:** A patient post-tonsillectomy presenting with persistent throat pain and a "foreign body" sensation (the scar tissue stretches the nerve over the elongated process). * **Diagnosis:** Palpation of the styloid process in the tonsillar fossa (reproduces pain) and confirmed by **3D CT scan** (Gold Standard). * **Treatment:** Surgical shortening of the styloid process via a transoral or cervical approach. * **Carotid Artery Syndrome:** A variant where the process compresses the carotid sheath, leading to syncopal episodes or visual disturbances.

Question 100: Facial nerve involvement in herpes zoster is known as?

A. Ramsay Hunt syndrome (Correct Answer)
B. Melkersson Rosenthal syndrome
C. Jaw wrinkling syndrome
D. Frey's 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 facial nerve palsy** (Lower Motor Neuron type). 2. **Otalgia** (severe ear pain). 3. **Vesicular eruptions** on the auricle, external auditory canal, or oropharynx. Because the facial nerve is closely associated with the vestibulocochlear nerve, patients may also experience tinnitus, hearing loss, or 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**). * **Jaw Wrinkling Syndrome:** A phenomenon of synkinesis where the skin of the jaw wrinkles during certain facial movements, often seen after recovery from facial nerve injury. * **Frey’s Syndrome (Auriculotemporal Syndrome):** Characterized by gustatory sweating and flushing over the parotid region during eating. It occurs due to aberrant reinnervation of sweat glands by parasympathetic fibers of the auriculotemporal nerve following parotid surgery. **High-Yield Clinical Pearls for NEET-PG:** * **Prognosis:** Ramsay Hunt syndrome has a poorer prognosis for facial nerve recovery compared to Bell’s Palsy. * **Treatment:** Combination of oral **Acyclovir** (or Valacyclovir) and **Corticosteroids** is the gold standard. * **Nerve Involved:** CN VII is primarily affected, but CN VIII, IX, and X can also be involved (polyneuritis).

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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