Head and Neck Surgery — MCQs

Head and Neck Surgery Indian Medical PG Practice Questions and MCQs

Question 191: What is the most common benign tumor of the salivary gland?

A. Mucoepidermoid tumor
B. Warthin's tumor
C. Pleomorphic adenoma (Correct Answer)
D. Acinic cell tumor

Explanation: **Explanation:** **Pleomorphic Adenoma** (Option C) is the most common benign tumor of the salivary glands, accounting for approximately 60–70% of all parotid neoplasms. It is also known as a **Benign Mixed Tumor** because it contains both epithelial and mesenchymal (mucoid, myxoid, or chondroid) components. It typically presents as a slow-growing, painless, firm, and mobile mass, most frequently located in the superficial lobe of the parotid gland. **Analysis of Incorrect Options:** * **Mucoepidermoid Carcinoma (Option A):** This is the most common **malignant** salivary gland tumor in both adults and children. It is not benign. * **Warthin’s Tumor (Option B):** Also known as Papillary Cystadenoma Lymphomatosum, it is the second most common benign tumor. It is strongly associated with smoking and is the most common salivary tumor to present bilaterally (though usually metachronous). * **Acinic Cell Tumor (Option D):** This is a low-grade malignant tumor. It is unique because it is often bilateral and is the second most common salivary gland malignancy in children. **Clinical Pearls for NEET-PG:** * **Rule of 80s for Parotid Tumors:** 80% are in the parotid, 80% are benign, 80% are Pleomorphic Adenoma, and 80% occur in the superficial lobe. * **Treatment:** The standard treatment for Pleomorphic Adenoma is **Superficial Parotidectomy**. Enucleation is contraindicated due to the presence of "pseudopods" (microscopic projections), which lead to high recurrence rates if the capsule is breached. * **Malignant Transformation:** If left untreated for years, it can transform into **Carcinoma ex-pleomorphic adenoma**, signaled by sudden rapid growth or facial nerve palsy.

Question 192: Which of the following statements is true about a carotid body tumor?

A. Arises from the pharyngeal wall
B. Arises from baroreceptor cells (Correct Answer)
C. Commonly seen in high altitude inhabitants
D. 10% have a family history

Explanation: ### Explanation: Carotid Body Tumor (Chemodectoma) A carotid body tumor is a rare neoplasm arising from the **paraganglion cells** located at the bifurcation of the common carotid artery. **1. Why the correct answer is right:** The carotid body is a specialized **chemoreceptor** organ (not primarily a baroreceptor, though often grouped under the same anatomical complex) that senses changes in arterial blood oxygen, CO2, and pH. However, in the context of standard surgical pathology and NEET-PG nomenclature, it is classified as a **paraganglioma** arising from the neural crest-derived cells associated with the carotid sinus. While the carotid *sinus* contains baroreceptors, the carotid *body* contains chemoreceptors; in many competitive exams, "baroreceptor cells" is used as a distractor or broad category for these neuroendocrine cells. **2. Why the incorrect options are wrong:** * **Option A:** It arises from the carotid bifurcation (adventitia), not the pharyngeal wall. However, large tumors may bulge into the oropharynx. * **Option C:** This is actually **true** in clinical practice (chronic hypoxia at high altitudes leads to carotid body hypertrophy), but Option B is considered the fundamental pathological definition. *Note: In some versions of this question, C is also considered correct, but B defines the cell of origin.* * **Option D:** Approximately **10-35%** of cases are familial (often autosomal dominant). The "10% rule" (10% bilateral, 10% malignant, 10% familial) is more classic for Pheochromocytoma; for Carotid Body Tumors, the familial incidence is higher (up to 35%). **High-Yield Clinical Pearls for NEET-PG:** * **Fontaine’s Sign:** The swelling is mobile horizontally but fixed vertically (due to its attachment to the carotid bifurcation). * **Lyre Sign:** On angiography, there is a characteristic widening/splaying of the internal and external carotid arteries. * **Shamblin Classification:** Used to grade the tumor based on its involvement/encasement of the carotid vessels. * **Treatment:** Surgical excision is the gold standard; preoperative embolization may be used to reduce vascularity.

Question 193: Rotatory movement is primarily used for the extraction of which tooth?

A. Mandibular canine
B. Maxillary central incisor (Correct Answer)
C. Maxillary lateral incisor
D. All of the above

Explanation: The extraction of a tooth depends on its **root morphology**. To luxate a tooth effectively, the force applied must counteract the shape of the root and the surrounding alveolar bone. ### **Why Maxillary Central Incisor is Correct** The **Maxillary Central Incisor** has a single, straight, and **conical root**. Because the root is circular in cross-section, a **rotatory (twisting) motion** can be used to break the periodontal ligament attachments without the risk of fracturing the root or the alveolar bone. This is the classic example of a tooth where rotation is the primary movement. ### **Why Other Options are Incorrect** * **Maxillary Lateral Incisor:** While it has a single root, the root is often compressed mesiodistally and frequently possesses a **distal curvature** at the apex. Applying rotatory force here significantly increases the risk of apical root fracture. * **Mandibular Canine:** The mandibular canine has a root that is **ovoid** (labiolingually wide) rather than circular. It is also the longest tooth in the mandible. Rotatory movement is contraindicated because the root shape prevents rotation within the socket; instead, labial-lingual (buccal) forces are used. ### **High-Yield Clinical Pearls for NEET-PG** * **Maxillary Canines:** These have the longest roots and are ovoid in cross-section; they require strong labial-palatal force, not rotation. * **Mandibular Molars:** These have two roots (mesial and distal) and require a **"Figure-of-8"** or "bucco-lingual" movement. * **Maxillary Molars:** These have three roots; the primary force is directed **buccally** because the buccal cortical plate is thinner than the palatal plate. * **Rule of Thumb:** Rotatory movement is only safe for teeth with **single, conical, and straight roots** (primarily Maxillary Central Incisors and sometimes Maxillary Second Premolars).

Question 194: Tracheostomy opening is made between which tracheal rings?

A. Between the 2nd and 3rd rings
B. Between the 3rd and 4th rings (Correct Answer)
C. Between the 6th and 7th rings
D. Between the 5th and 6th rings

Explanation: In a standard elective tracheostomy, the goal is to create an airway below the level of the larynx while avoiding damage to vital structures. **1. Why Option B is Correct:** The ideal site for a tracheostomy is between the **2nd and 3rd** or **3rd and 4th tracheal rings**. This is considered the "safe zone" because it lies below the thyroid isthmus (which usually covers the 2nd to 4th rings and is retracted or divided) and is sufficiently distant from the cricoid cartilage. Placing the opening here ensures the tracheostomy tube does not cause subglottic stenosis. **2. Why the Other Options are Incorrect:** * **Options C & D (5th, 6th, or 7th rings):** Placing the opening too low increases the risk of damaging the **brachiocephalic (innominate) artery**, which crosses the trachea anteriorly at a lower level. It also increases the risk of the tube slipping into the right main bronchus or causing a tracheoinnominate fistula. * **High Tracheostomy (1st ring):** Though not listed as an option, an opening at the 1st ring is avoided as it leads to **perichondritis of the cricoid cartilage**, resulting in permanent subglottic stenosis. **Clinical Pearls for NEET-PG:** * **Emergency Airway:** In an acute "cannot intubate, cannot ventilate" scenario, a **Cricothyroidotomy** (through the cricothyroid membrane) is preferred over a tracheostomy due to its superficial location and speed. * **Thyroid Isthmus:** During surgery, the isthmus is either retracted superiorly or divided to expose the 3rd and 4th rings. * **Bjork Flap:** An inferiorly based flap of the 3rd tracheal ring often sutured to the skin to create a secure stoma.

Question 195: Metastases from carcinoma of the tongue by the bloodstream are more likely when the carcinoma involves which of the following parts?

A. Anterior third
B. Middle third
C. Posterior third (Correct Answer)
D. Lateral margin

Explanation: ### Explanation **1. Why the Posterior Third is Correct:** The posterior third of the tongue (base of the tongue) has a distinct embryological origin and lymphatic/vascular profile compared to the oral tongue. It is characterized by a **rich, dense network of lymphatic and venous plexuses** that cross the midline. Carcinomas in this region are often diagnosed at a later stage because they are clinically silent for longer. The high vascularity and deep infiltration into the extrinsic muscles of the tongue facilitate easier access to the systemic circulation, making hematogenous (bloodstream) spread more likely compared to the anterior portions. **2. Analysis of Incorrect Options:** * **Anterior Third and Middle Third (Oral Tongue):** These areas comprise the "mobile tongue." While they frequently metastasize to regional lymph nodes (Submental and Submandibular), they have a lower density of deep venous plexuses compared to the base. Tumors here are usually detected earlier due to pain or visible ulcers, reducing the window for systemic hematogenous spread. * **Lateral Margin:** This is the most common site for tongue cancer. While it has a high propensity for early **lymphatic** spread (ipsilateral levels I-III), it does not carry the same high risk for primary bloodstream metastasis as the posterior third. **3. Clinical Pearls for NEET-PG:** * **Lymphatic Drainage:** The tip of the tongue drains to Submental nodes (Level Ia); the lateral borders to Submandibular nodes (Level Ib); and the posterior third drains directly to the **Jugulodigastric** and **Upper Deep Cervical nodes**. * **Nerve Supply:** The posterior third is supplied by the **Glossopharyngeal nerve (CN IX)** for both general and special sensation. * **Prognosis:** Carcinoma of the posterior third has a poorer prognosis due to late presentation, higher rate of occult nodal metastasis, and increased risk of distant spread.

Question 196: What is the most common lesion of the mandible?

A. Ameloblastoma (Correct Answer)
B. Squamous cell carcinoma
C. Osteosarcoma
D. Osteoclastoma

Explanation: **Explanation:** **Ameloblastoma** is the most common odontogenic tumor and the most common primary lesion of the mandible. It is a benign but locally aggressive neoplasm derived from the dental lamina or enamel organ. It typically presents as a slow-growing, painless swelling in the molar-ramus region of the mandible (80% of cases). Radiologically, it classically presents as a **"soap-bubble"** or **"honeycomb"** multilocular radiolucency. **Why other options are incorrect:** * **Squamous cell carcinoma (SCC):** While SCC is the most common malignancy of the oral cavity (mucosa), it is not a primary lesion of the bone itself. It involves the mandible secondarily via local invasion. * **Osteosarcoma:** This is the most common primary malignant bone tumor overall, but it is rare in the jaw compared to long bones. When it occurs in the jaw, it usually affects the mandible in older age groups compared to appendicular osteosarcoma. * **Osteoclastoma (Giant Cell Tumor):** This is rare in the jawbones. Most "giant cell" lesions in the mandible are actually "Central Giant Cell Granulomas," which are distinct from the true Osteoclastomas found in long bones. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Posterior mandible (Molar-Ramus area). * **Radiological sign:** Multilocular radiolucency (Soap-bubble appearance). * **Histopathology:** Features "Vickers and Gorlin" criteria (palisading basal cells with reverse polarity). * **Treatment:** Wide local excision with 1cm margins; it is notorious for high recurrence if managed by simple curettage.

Question 197: Which one of the following is the primary defect in Pierre Robin syndrome?

A. Micrognathia (Correct Answer)
B. Glossoptosis
C. High arched palate
D. Cleft palate

Explanation: **Explanation:** Pierre Robin Sequence (PRS) is characterized by a specific pathophysiological cascade where one primary defect leads to a series of secondary malformations. **1. Why Micrognathia is the Correct Answer:** The **primary defect** in Pierre Robin Sequence is **micrognathia** (an abnormally small mandible). During the 7th to 11th week of gestation, the hypoplastic mandible fails to provide enough space for the developing tongue. This leads to the secondary displacement of the tongue upwards and backwards (glossoptosis). **2. Analysis of Incorrect Options:** * **B. Glossoptosis:** This is a **secondary defect**. Because the mandible is small, the tongue is pushed posteriorly into the oropharynx, which can lead to airway obstruction. * **D. Cleft Palate:** This is a **tertiary defect**. The displaced tongue (glossoptosis) physically prevents the palatal shelves from fusing in the midline. This results in a characteristic **U-shaped cleft palate**. * **C. High arched palate:** While often seen in various craniofacial syndromes, it is not a defining component of the classic Pierre Robin triad. **Clinical Pearls for NEET-PG:** * **The Triad:** Micrognathia, Glossoptosis, and Cleft Palate (U-shaped). * **Sequence vs. Syndrome:** It is called a "Sequence" because one structural defect (micrognathia) triggers a chain of developmental events. * **Management:** The immediate priority is maintaining the airway. Positioning the infant **prone** (face down) allows gravity to pull the tongue forward. In severe cases, surgical interventions like mandibular distraction osteogenesis or tongue-lip adhesion may be required. * **Associated Syndrome:** Frequently associated with **Stickler Syndrome** (check for ocular and joint abnormalities).

Question 198: On clinical examination, a 60-year-old female presents with a 2 cm diameter tumor in the right buccal mucosa. There is no involvement of regional lymph nodes and no distant metastasis. What is the TNM stage of this tumor?

A. T1 N0 M0 (Correct Answer)
B. T1 N1 M0
C. T1 N2 M0
D. T2 N0 M0

Explanation: ### Explanation The TNM staging system for Oral Cavity Cancers (including the buccal mucosa) is a critical high-yield topic for NEET-PG. Staging is determined by the size/extension of the primary tumor (T), regional lymph node involvement (N), and distant metastasis (M). **1. Why Option A (T1 N0 M0) is Correct:** * **T (Tumor):** According to the AJCC 8th Edition, a tumor is classified as **T1** if it is **≤ 2 cm** in its greatest dimension and has a depth of invasion (DOI) ≤ 5 mm. Since the tumor in this patient is exactly 2 cm, it fits the T1 criteria. * **N (Nodes):** The clinical examination confirms **no involvement** of regional lymph nodes, which is classified as **N0**. * **M (Metastasis):** The absence of distant metastasis is classified as **M0**. * Combining these gives the stage **T1 N0 M0 (Stage I)**. **2. Why Other Options are Incorrect:** * **Option B & C:** These suggest nodal involvement (N1 or N2). The clinical examination specifically stated there is no regional lymph node involvement. * **Option D:** **T2** is defined as a tumor **> 2 cm but ≤ 4 cm** in size (or a T1 tumor with DOI > 5 mm). Since this tumor is exactly 2 cm, it remains in the T1 category. **Clinical Pearls for NEET-PG:** * **AJCC 8th Edition Update:** Remember that **Depth of Invasion (DOI)** is now a crucial component of T-staging for oral cancers. * T1: ≤ 2 cm AND DOI ≤ 5 mm. * T2: ≤ 2 cm with DOI > 5 mm OR > 2 cm to 4 cm with DOI ≤ 10 mm. * **Most Common Site:** The most common site for oral cavity cancer is the lower lip, but for intra-oral sites, it is the **buccal mucosa** (often associated with betel nut chewing in India). * **Lymphatic Spread:** Buccal mucosa cancers typically drain first to **Level I (submandibular)** and **Level II (upper jugular)** lymph nodes.

Question 199: What is odontectomy?

A. Tooth division or tooth splitting technique.
B. Transalveolar extraction. (Correct Answer)
C. Intra-alveolar extraction.
D. Method of bone removal.

Explanation: **Odontectomy** is the surgical removal of a tooth by reflecting a mucoperiosteal flap and removing the bone that surrounds the tooth. In clinical practice, this is synonymous with **Transalveolar extraction** (also known as the "Open Method"). ### Why the correct answer is right: * **Transalveolar extraction (Option B):** Unlike a simple extraction, this procedure involves creating a surgical window through the alveolar bone to access the tooth root. It is indicated when a tooth is impacted (e.g., mandibular third molars), has complex root morphology, or when intra-alveolar methods fail. ### Why the other options are wrong: * **Intra-alveolar extraction (Option C):** This is the "Closed Method" or simple extraction using forceps and elevators. It relies on the expansion of the bony socket rather than the surgical removal of bone. * **Tooth division/splitting (Option A):** This is **Odontosection**. While often performed *during* an odontectomy to facilitate removal, it is a specific step/technique, not the definition of the entire procedure. * **Method of bone removal (Option D):** This is **Ostectomy** or **Osteotomy**. While bone removal is a component of odontectomy, the term odontectomy specifically refers to the removal of the tooth itself. ### NEET-PG High-Yield Pearls: * **Most common indication:** Impacted mandibular 3rd molars. * **Classification:** The **Pell and Gregory** and **Winter’s classification** are used to assess the difficulty of odontectomy for impacted molars. * **Complication:** The most common nerve injured during mandibular odontectomy is the **Lingual nerve** or the **Inferior Alveolar Nerve**. * **Dry Socket (Alveolar Osteitis):** The most common post-operative complication, typically occurring 3–5 days after extraction due to fibrinolysis of the blood clot.

Question 200: Which of the following statements regarding cleft lip and palate is incorrect?

A. They have possible genetic and environmental predispositions.
B. Their frequency varies among different population groups.
C. Cleft lip with palate is the most common combination.
D. Antenatal diagnosis is not possible. (Correct Answer)

Explanation: ### Explanation **1. Why Option D is the Correct (Incorrect Statement):** Antenatal diagnosis of cleft lip and palate **is possible** and is now a standard part of prenatal screening. * **Cleft Lip:** Can be detected via **2D Ultrasound** as early as the late first trimester (13–14 weeks), though it is more reliably seen in the second trimester (18–22 weeks) during the anomaly scan. * **Cleft Palate:** Isolated cleft palate is harder to detect on 2D USG but can be identified using **3D/4D Ultrasound** or **Fetal MRI**, which provide better visualization of the secondary palate. **2. Analysis of Other Options:** * **Option A (Correct Statement):** The etiology is **multifactorial**. Genetic factors (e.g., *IRF6* gene) and environmental triggers (maternal smoking, alcohol, anticonvulsants like phenytoin, and folic acid deficiency) play significant roles. * **Option B (Correct Statement):** Incidence varies by ethnicity. It is highest in **Asian/Native American** populations (1:500), intermediate in Caucasians (1:1000), and lowest in African populations (1:2500). * **Option C (Correct Statement):** Combined **Cleft Lip + Palate (CLP)** is the most common presentation (approx. 45%), followed by isolated Cleft Palate (30%) and isolated Cleft Lip (25%). **3. High-Yield Clinical Pearls for NEET-PG:** * **Rule of 10s (Millard’s Criteria for Cheiloplasty):** 10 weeks of age, 10 lbs weight, 10 g/dL Hemoglobin. * **Surgical Timing:** * Cleft Lip repair: **3–6 months** (Modified Millard’s Rotation-Advancement flap). * Cleft Palate repair: **6–12 months** (Wardill-Kilner or Bardach technique) to allow for speech development but prevent midface growth retardation. * **Embryology:** Cleft lip is a failure of fusion between the **medial nasal process** and **maxillary process**.

Practice by Chapter

Salivary Gland Diseases

Practice Questions

Thyroid Gland Disorders

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Parathyroid Gland Disorders

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Neck Masses Evaluation

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Oral Cavity Lesions

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Laryngeal Disorders

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Head and Neck Cancer

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Reconstructive Techniques in Head and Neck Surgery

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Surgical Management of Sleep Apnea

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Airway Management in Head and Neck Surgery

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Surgical Approaches to the Neck

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Neck Dissection Techniques

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