Otolaryngology Basics — MCQs

Otolaryngology Basics Indian Medical PG Practice Questions and MCQs

Question 131: Which is the narrowest part of the larynx in children?

A. Supraglottic
B. Subglottic (Correct Answer)
C. Glottic region
D. None

Explanation: **Explanation:** The larynx undergoes significant anatomical changes during development. In children (infants and young children), the **Subglottic region** (specifically at the level of the **Cricoid cartilage**) is the narrowest part of the airway. **1. Why Subglottic is Correct:** In pediatric anatomy, the larynx is shaped like a **funnel** or a cone. The cricoid cartilage is the only complete cartilaginous ring in the respiratory tract. Because it is a rigid, non-expandable circle, any mucosal edema in this region significantly compromises the airway. This is the physiological basis for why **Croup (Laryngotracheobronchitis)** is so dangerous in children. **2. Why other options are incorrect:** * **Glottic region (Option C):** In **adults**, the glottis (the space between the vocal cords) is the narrowest part. As a child matures, the larynx transitions from a funnel shape to a **cylindrical** shape, shifting the narrowest point upward to the glottis. * **Supraglottic (Option A):** This area is wider and more distensible; while it can be affected by infections (like Epiglottitis), it is not the narrowest anatomical point. **Clinical Pearls for NEET-PG:** * **Shape:** Pediatric larynx is **funnel-shaped**; Adult larynx is **cylindrical**. * **Position:** The pediatric larynx is higher in the neck (at the level of **C3-C4**) compared to adults (**C4-C6**). * **Poiseuille’s Law:** Because the subglottis is the narrowest point, 1 mm of edema reduces the cross-sectional area by approximately 75% in an infant, compared to only 44% in an adult. * **Uncuffed Tubes:** Historically, uncuffed endotracheal tubes were preferred in children to prevent pressure necrosis at the narrow cricoid level (though modern practice is evolving).

Question 132: Multiple dentigerous cysts are present in which of the following conditions?

A. Maroteux Lamy syndrome
B. Cleidocranial dysplasia
C. Both of the above (Correct Answer)
D. None of the above

Explanation: **Explanation:** A **dentigerous cyst** (follicular cyst) is an odontogenic cyst that develops around the crown of an unerupted or developing tooth. While solitary dentigerous cysts are common, the presence of **multiple dentigerous cysts** is rare and typically associated with specific systemic syndromes. 1. **Maroteaux-Lamy Syndrome (Mucopolysaccharidosis Type VI):** This is a lysosomal storage disorder caused by a deficiency of the enzyme arylsulfatase B. It is characterized by skeletal abnormalities and coarse facial features. In the oral cavity, it frequently presents with multiple enlarged dental follicles and dentigerous cysts, often associated with impacted teeth. 2. **Cleidocranial Dysplasia:** This is an autosomal dominant skeletal disorder (RUNX2 gene mutation) characterized by hypoplastic/absent clavicles and delayed closure of cranial sutures. A hallmark dental finding is the presence of **multiple supernumerary teeth** and failure of permanent teeth to erupt. These impacted teeth frequently lead to the formation of multiple dentigerous cysts. **Why the other options are incorrect:** Since both Maroteaux-Lamy syndrome and Cleidocranial dysplasia are well-documented causes of multiple dentigerous cysts, "Both of the above" is the most accurate choice. **High-Yield Clinical Pearls for NEET-PG:** * **Radiological Appearance:** A dentigerous cyst appears as a well-defined unilocular radiolucency attached to the neck of an unerupted tooth (cementoenamel junction). * **Differential Diagnosis for Multiple Odontogenic Keratocysts (OKCs):** Do not confuse multiple dentigerous cysts with multiple OKCs. Multiple OKCs are a classic feature of **Gorlin-Goltz Syndrome** (Nevoid Basal Cell Carcinoma Syndrome). * **Other associations:** Multiple dentigerous cysts can also rarely be seen in Gardner Syndrome.

Question 133: Globulomaxillary cyst is:

A. A soft tissue cyst present often between the maxillary lateral incisor and cuspid teeth.
B. A bone cyst often present between the incisor and cuspid teeth. (Correct Answer)
C. A cyst present between the midline of the palate.
D. A cyst present in the incisive canal.

Explanation: **Explanation:** The **Globulomaxillary cyst** is historically described as a fissural cyst arising from epithelial remnants trapped during the fusion of the globular portion of the medial nasal process with the maxillary process. **1. Why the Correct Answer is Right:** Option B is correct because the globulomaxillary cyst is an **intraosseous (bone) cyst**. Radiographically, it typically presents as a well-defined, **inverted pear-shaped radiolucency** located between the roots of the **maxillary lateral incisor and the canine (cuspid)**. It often causes the roots of these teeth to diverge. **2. Analysis of Incorrect Options:** * **Option A:** This describes a soft tissue cyst. The **Nasolabial (Nasoealveolar) cyst** is the classic soft tissue cyst in this region, appearing clinically as a swelling in the canine fossa or alar base, but it does not show as a primary bone radiolucency. * **Option C:** This describes a **Median Palatal cyst**, which is located in the midline of the hard palate, posterior to the incisive papilla. * **Option D:** This describes an **Incisive Canal cyst (Nasopalatine duct cyst)**, which is the most common non-odontogenic cyst of the oral cavity, located in the midline of the anterior maxilla. **3. Clinical Pearls for NEET-PG:** * **Modern Concept:** Many pathologists now consider "Globulomaxillary cyst" a clinical/radiographic term rather than a specific diagnosis. Most cysts in this location, upon biopsy, turn out to be **Lateral Radicular cysts**, **Keratocystic Odontogenic Tumors (OKC)**, or **Lateral Periodontal cysts**. * **Radiographic Hallmark:** Look for the **"Inverted Pear"** shape between the lateral incisor and canine. * **Vitality Testing:** Teeth associated with a true globulomaxillary cyst are typically **vital**, which helps differentiate it from a radicular cyst (associated with non-vital teeth).

Question 134: Which of the following statements about Pendred syndrome is FALSE?

A. Thyroidectomy is the treatment. (Correct Answer)
B. It is caused by mutation of the PENDRIN gene.
C. It is associated with sensorineural deafness.
D. Goitre is a common feature.

Explanation: **Explanation:** **Pendred Syndrome** is an autosomal recessive disorder characterized by the triad of **sensorineural hearing loss (SNHL)**, **goiter**, and an abnormal perchlorate discharge test. 1. **Why Option A is the Correct (False) Statement:** Thyroidectomy is **not** the treatment for Pendred syndrome. Most patients are clinically euthyroid or mildly hypothyroid. The goiter is managed with **Thyroxine (T4) supplementation**, which suppresses TSH levels and reduces the size of the goiter. Surgery is only indicated in rare cases of severe compression symptoms or malignancy. 2. **Analysis of Other Options:** * **Option B:** It is caused by mutations in the **SLC26A4 gene** (located on chromosome 7q31), which encodes the protein **Pendrin**. Pendrin acts as an ion exchanger (chloride/iodide/bicarbonate) in the inner ear and thyroid. * **Option C:** SNHL is a hallmark feature. It is typically congenital, bilateral, and severe. It is classically associated with inner ear malformations, most commonly an **Enlarged Vestibular Aqueduct (EVA)** or Mondini dysplasia. * **Option D:** Goiter usually develops in late childhood or early puberty due to a defect in iodine organification. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic:** "P" for **P**endred, **P**endrin gene, **P**erchlorate discharge test (Positive), and **P**artial organification defect. * **Radiology:** The most common radiological finding is **Enlarged Vestibular Aqueduct (EVA)**. * **Diagnosis:** A **Perchlorate Discharge Test** is used to demonstrate the iodine organification defect (though genetic testing is now the gold standard). * Pendred syndrome is one of the most common causes of syndromic genetic hearing loss.

Question 135: Which of the following statements about epiglottitis is TRUE?

A. It is more common in infants.
B. It is seen in elderly individuals using crack cocaine. (Correct Answer)
C. Blood culture is almost always positive.
D. Co-amoxiclav is the treatment of choice.

Explanation: **Explanation:** **Epiglottitis** (Supraglottitis) is a life-threatening inflammatory condition of the epiglottis and surrounding structures. **Why Option B is Correct:** While traditionally a pediatric disease, the epidemiology has shifted due to the Hib vaccine. In adults, epiglottitis is increasingly recognized in specific risk groups. **Thermal injury** to the supraglottic airway from inhaling heated vapors, such as those produced during **crack cocaine** smoking or marijuana use, can cause rapid-onset edema and inflammation mimicking infectious epiglottitis. **Analysis of Incorrect Options:** * **Option A:** It is **not** more common in infants. The peak incidence in children used to be 2–5 years, but it is now more frequently seen in **adults** (mean age 40s) due to widespread *Haemophilus influenzae* type b (Hib) vaccination. * **Option C:** Blood cultures are positive in approximately **25–30% of adult cases** and about 50–70% of pediatric cases. They are "often" positive but certainly not "almost always" (which implies >90%). * **Option D:** The treatment of choice is **Ceftriaxone** (a 3rd generation cephalosporin) to cover beta-lactamase-producing *H. influenzae*. While Co-amoxiclav has activity, Ceftriaxone is the gold standard for empirical management in acute settings. **High-Yield Clinical Pearls for NEET-PG:** * **Causative Agent:** *H. influenzae* type b (most common), *Streptococcus pyogenes*, and *Staphylococcus aureus*. * **Classic Sign:** **Thumb sign** on lateral X-ray of the neck. * **Clinical Presentation:** The "4 Ds"—Drooling, Dysphagia, Dysphonia, and Distressed inspiratory efforts (Stridor). Patients often assume the **Tripod position**. * **Management:** The priority is **airway maintenance**. Do not examine the throat with a tongue depressor in children as it may trigger laryngospasm.

Question 136: Which of the following anatomical structures is known as the "Gateway of tears"?

A. Killian's dehiscence (Correct Answer)
B. Rathke's pouch
C. Waldeyer's ring
D. Sinus of Morgagni

Explanation: ### Explanation **Killian’s dehiscence** is a weak triangular area in the posterior wall of the lower pharynx. It is located between the two parts of the inferior constrictor muscle: the upper oblique fibers (**thyropharyngeus**) and the lower horizontal fibers (**cricopharyngeus**). It is known as the **"Gateway of Tears"** because it is the most common site for accidental perforation during esophagoscopy, leading to potentially fatal mediastinitis. #### Analysis of Options: * **Killian’s Dehiscence (Correct):** Due to the lack of longitudinal muscle coating, this area is structurally weak. Increased intraluminal pressure (as seen in incoordination during swallowing) can cause the mucosa to herniate through this gap, forming a **Zenker’s diverticulum** (pulsion diverticulum). * **Rathke’s Pouch:** An embryological ectodermal outpouching of the primitive oral cavity (stomodeum) that gives rise to the anterior pituitary. * **Waldeyer’s Ring:** A ring of lymphoid tissue in the pharynx (tonsils, adenoids) that acts as a first line of defense against pathogens. * **Sinus of Morgagni:** The gap between the upper border of the superior constrictor muscle and the base of the skull. It transmits the Eustachian tube and levator veli palatini. #### High-Yield Clinical Pearls for NEET-PG: * **Zenker’s Diverticulum:** Always occurs through Killian’s dehiscence. Symptoms include dysphagia, regurgitation of undigested food, and halitosis. * **Killian-Jamieson Dehiscence:** A separate weak area located *below* the cricopharyngeus, between it and the esophagus. * **Safety Rule:** To avoid perforation at the "Gateway of Tears," the esophagoscope should always be passed under direct vision or with the patient’s neck properly flexed.

Question 137: Which of the following statements about a double lumen tracheostomy tube is FALSE?

A. It allows for easy removal of the inner cannula.
B. It facilitates easy cleaning of the inner cannula.
C. It permits easy replacement of the inner cannula.
D. It does not have an inner cannula. (Correct Answer)

Explanation: ### Explanation **Concept Overview:** A **double lumen tracheostomy tube** consists of two parts: an **outer cannula** (which stays in the trachea to maintain the stoma) and an **inner cannula** (which fits inside the outer cannula). The primary purpose of this design is to prevent airway obstruction caused by crusting or thick secretions. **Why Option D is the Correct Answer:** Option D is a false statement because, by definition, a "double lumen" tube **must** have an inner cannula. The presence of two lumens (the space within the inner cannula and the space between the inner and outer cannulas) is what distinguishes it from a single lumen tube. **Analysis of Incorrect Options:** * **Option A & B:** These are true statements. The inner cannula is designed to be **easily removed and cleaned**. In patients with thick secretions, the inner cannula can be taken out, scrubbed, and cleared of mucus plugs without removing the entire tracheostomy tube from the neck. * **Option C:** This is a true statement. If the inner cannula becomes damaged or permanently blocked, it can be **easily replaced** with a new one, ensuring a patent airway without the trauma of a full tube change. **High-Yield Clinical Pearls for NEET-PG:** * **Safety:** Double lumen tubes are safer for long-term care because they reduce the risk of asphyxia from crusting. * **Single Lumen Tubes:** These are typically used in pediatric patients because the inner cannula would significantly narrow the already small airway diameter. * **Fenestrated Tubes:** These have a hole in the outer cannula to allow air to pass through the vocal cords, facilitating speech. * **Cuffed vs. Uncuffed:** Cuffed tubes are used in patients on ventilators or at risk of aspiration; uncuffed tubes are used for long-term management in stable patients.

Question 138: Which type of laryngoscope blade is curved?

A. Miller
B. MacIntosh (Correct Answer)
C. Muller
D. Merkerl

Explanation: **Explanation:** The **MacIntosh blade** is the most commonly used **curved** laryngoscope blade. Its design is based on the anatomical curvature of the tongue. During intubation, the tip of the MacIntosh blade is placed into the **vallecula** (the space between the base of the tongue and the epiglottis). By applying upward and forward pressure on the hyoepiglottic ligament, the epiglottis is lifted indirectly to reveal the glottis. This indirect elevation is less traumatic and provides more room for endotracheal tube passage. **Analysis of Options:** * **A. Miller:** This is a **straight** blade. It is designed to be passed over the posterior surface of the epiglottis to lift it **directly**. It is preferred in infants and children because they have a floppy, omega-shaped epiglottis that is difficult to lift indirectly. * **C. Muller:** This is a distractor. While there is a "Müller's maneuver" used in ENT to assess airway collapse in sleep apnea, there is no standard "Muller laryngoscope blade" used for intubation. * **D. Merkerl:** This is an incorrect option/distractor with no relevance to standard laryngoscopy. **Clinical Pearls for NEET-PG:** * **Placement:** MacIntosh = Vallecula (Indirect lift); Miller = Epiglottis (Direct lift). * **Pediatric Airway:** The Miller blade is the gold standard for neonates due to their high, anterior larynx and large epiglottis. * **Difficult Airway:** The **McCoy blade** is a modified MacIntosh blade with a hinged tip that allows for better elevation of the epiglottis in difficult cases.

Question 139: Which of the following statements is NOT true about Glossopharyngeal neuralgia?

A. Eagle's syndrome
B. Reichert syndrome
C. Syncope is not seen (Correct Answer)
D. Tonsillectomy has to be done to approach and treat glossopharyngeal neuralgia

Explanation: **Glossopharyngeal Neuralgia (GPN)** is a rare clinical condition characterized by paroxysms of severe, stabbing, lancinating pain in the distribution of the 9th cranial nerve (tonsillar fossa, base of tongue, and ear). ### **Explanation of Options** * **Why Option C is the Correct Answer (The False Statement):** **Syncope is indeed seen** in about 10% of GPN cases. This occurs due to the close proximity of the glossopharyngeal nerve to the vagus nerve. Intense afferent impulses from the 9th nerve can trigger a **vasovagal response**, leading to bradycardia, hypotension, and subsequent syncope. Therefore, stating that syncope is "not seen" is clinically incorrect. * **Option A (Eagle’s Syndrome):** This is a specific cause of GPN where an **elongated styloid process** (or calcified stylohyoid ligament) compresses the glossopharyngeal nerve. It is a classic association. * **Option B (Reichert Syndrome):** This is an eponymous name for primary glossopharyngeal neuralgia, characterized by idiopathic paroxysmal facial pain. * **Option D (Tonsillectomy):** In cases where GPN is caused by Eagle’s syndrome, a **trans-oral approach** is often used to reach the styloid process. This typically requires a tonsillectomy to provide adequate surgical exposure for styloidectomy. ### **Clinical Pearls for NEET-PG** * **Trigger Factors:** Swallowing (most common), chewing, coughing, or talking. * **Pain Distribution:** Often referred to the ear (**Jacobson’s nerve** involvement), known as otalgia. * **First-line Medical Management:** Carbamazepine (similar to Trigeminal Neuralgia). * **Surgical Management:** Microvascular decompression (MVD) of the 9th nerve or Styloidectomy (if Eagle's syndrome). * **Differential Diagnosis:** Must be distinguished from Trigeminal Neuralgia (V3) based on the trigger zone (tonsillar pillar vs. face).

Question 140: Which laryngeal cartilage forms a complete circle?

A. Arytenoid
B. Cricoid (Correct Answer)
C. Thyroid
D. Hyoid

Explanation: **Explanation:** The **Cricoid cartilage** is the only laryngeal cartilage that forms a **complete anatomical circle** (signet ring shape). It is located at the level of the **C6 vertebra** and serves as the foundation of the larynx. It consists of a narrow anterior arch and a broad posterior lamina. This complete ring structure is vital for maintaining airway patency but also represents the narrowest part of the upper airway in infants and children. **Analysis of Incorrect Options:** * **Arytenoid:** These are paired, pyramid-shaped cartilages that sit atop the cricoid lamina. They are essential for vocal cord movement but do not form a ring. * **Thyroid:** This is the largest laryngeal cartilage (shield-shaped). It is composed of two laminae that meet anteriorly (forming the laryngeal prominence) but remain **open posteriorly**, making it an incomplete circle. * **Hyoid:** While it serves as an attachment point for laryngeal muscles, the hyoid is a U-shaped bone, not a laryngeal cartilage. **High-Yield Clinical Pearls for NEET-PG:** * **Narrowest part of the airway:** In adults, it is the **Rima Glottidis** (vocal cords); in children (under 8-10 years), it is the **Cricoid cartilage**. * **Sellick’s Maneuver:** This involves applying cricoid pressure to occlude the esophagus against the C6 vertebra, preventing gastric regurgitation during intubation. * **Safety Landmark:** The cricoid is the landmark for performing an emergency **cricothyroidotomy** (via the cricothyroid membrane). * **Histology:** The Cricoid, Thyroid, and most of the Arytenoid are made of **Hyaline cartilage** and tend to calcify with age.

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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