Head and Neck Surgery — MCQs

Head and Neck Surgery Indian Medical PG Practice Questions and MCQs

Question 11: A mid tracheostomy is done over which tracheal rings?

A. 1st and 2nd tracheal rings
B. 2nd and 3rd tracheal rings (Correct Answer)
C. 3rd and 4th tracheal rings
D. 5th and 6th tracheal rings

Explanation: Tracheostomy is a life-saving surgical procedure where an opening is made in the anterior wall of the trachea. The classification of tracheostomy depends on its relationship to the **isthmus of the thyroid gland**, which typically overlies the 2nd, 3rd, and 4th tracheal rings. ### **Explanation of Options** * **Correct Answer: B (2nd and 3rd tracheal rings)** A **Mid Tracheostomy** is the most preferred elective procedure. It is performed by either retracting the thyroid isthmus or dividing it to access the **2nd and 3rd (or sometimes 3rd and 4th) tracheal rings**. This site is ideal because it is far enough from the cricoid cartilage to prevent subglottic stenosis but high enough to avoid major vessels in the superior mediastinum. * **Option A (1st and 2nd rings):** This is a **High Tracheostomy**. It is generally avoided because proximity to the cricoid cartilage increases the risk of **perichondritis** and subsequent **subglottic stenosis**, which is difficult to treat. * **Option C (3rd and 4th rings):** While sometimes used for mid/low tracheostomy, the standard "Mid" definition specifically targets the 2nd and 3rd rings after isthmus management. * **Option D (5th and 6th rings):** This is a **Low Tracheostomy**. It is technically difficult due to the increasing depth of the trachea as it follows the curvature of the spine. It also poses a high risk of injury to the **innominate artery** and the **thyroid ima artery**. ### **NEET-PG High-Yield Pearls** * **Emergency Airway:** Cricothyroidotomy is the procedure of choice for emergency airway access, not tracheostomy. * **Most Common Complication:** Post-operative bleeding (from the thyroid isthmus or anterior jugular veins). * **Most Common Late Complication:** Tracheal stenosis. * **Bjork Flap:** An inferiorly based flap of the 2nd or 3rd tracheal ring sewn to the skin to create a secure tract.

Question 12: What is the most common complication of tracheostomy?

A. Pneumothorax
B. Surgical emphysema (Correct Answer)
C. Injury to the large vessels
D. Injury to oesophagus

Explanation: **Explanation:** **Surgical emphysema** is the most common complication of tracheostomy. It occurs when air escapes from the trachea into the subcutaneous tissues of the neck. This typically happens due to: 1. **Tight wound closure:** If the skin incision is sutured too tightly around the tracheostomy tube, air cannot escape externally and is forced into the tissue planes. 2. **Excessive dissection:** Extensive dissection of the pretracheal fascia allows air to track easily into the subcutaneous space. 3. **Coughing:** Increased intratracheal pressure during coughing episodes post-procedure pushes air into the surrounding soft tissues. **Analysis of Incorrect Options:** * **Pneumothorax (A):** While a serious complication, it is less common. It occurs more frequently in children (due to higher pleural domes) or if the pleura is accidentally injured during a low tracheostomy. * **Injury to Large Vessels (C):** This is a rare but life-threatening intraoperative complication. The most commonly involved vessel is the **inferior thyroid vein**. Late-stage hemorrhage is usually due to a tracheoinnominate artery fistula. * **Injury to Oesophagus (D):** This is rare and usually occurs due to poor surgical technique or "through-and-through" injury to the posterior tracheal wall, especially in emergency settings or in children with soft tracheas. **High-Yield Clinical Pearls for NEET-PG:** * **Most common immediate complication:** Hemorrhage (usually from anterior jugular veins or thyroid isthmus). * **Most common overall/early complication:** Surgical emphysema. * **Most common late complication:** Tracheal stenosis. * **Most common cause of death post-tracheostomy:** Dislodgement of the tube or tube blockage. * **Apnoeic Pause:** Occurs immediately after opening the trachea in patients with chronic CO2 retention (loss of hypoxic drive).

Question 13: What is the most common nerve in the neck from which schwannoma arises?

A. Trigeminal
B. Accessory
C. Hypoglossal
D. Vagus nerve (Correct Answer)

Explanation: **Explanation:** **Schwannomas** (neurilemmomas) are benign, slow-growing tumors arising from the Schwann cells of the nerve sheath. In the head and neck region, they most commonly involve the sensory or motor nerves. **Why the Vagus Nerve is Correct:** The **Vagus nerve (CN X)** is the most common site of origin for extracranial schwannomas in the neck. These tumors typically arise within the carotid space. Clinically, they present as a painless, slow-growing, mobile neck mass. A classic diagnostic sign is that the mass can be moved **laterally** but not vertically (because the nerve is fixed superiorly and inferiorly). On imaging, a Vagus schwannoma typically displaces the internal carotid artery medially and the internal jugular vein laterally. **Analysis of Incorrect Options:** * **Trigeminal (A):** While trigeminal schwannomas occur, they are usually intracranial (involving the Gasserian ganglion) rather than presenting as primary neck masses. * **Accessory (B) & Hypoglossal (C):** Both nerves can develop schwannomas, but they are significantly rarer than those arising from the Vagus nerve or the cervical sympathetic chain. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Vagus nerve (CN X) is #1; Cervical Sympathetic Chain is #2. * **Imaging (MRI):** Schwannomas show intense enhancement and may exhibit the "target sign" (central low signal, peripheral high signal on T2). * **Histology:** Look for **Antoni A** (hypercellular, Verocay bodies) and **Antoni B** (hypocellular, myxoid) patterns. They are **S-100 positive**. * **Surgical Note:** Unlike neurofibromas, schwannomas are encapsulated and can often be dissected off the nerve fibers, preserving nerve function.

Question 14: What is the recommended surgical approach for a glossopharyngeal neurectomy?

A. Tonsillectomy approach (Correct Answer)
B. Transpalatal approach
C. Transmandibular approach
D. Transpharyngeal approach

Explanation: **Explanation:** The **glossopharyngeal nerve (CN IX)** lies in close anatomical proximity to the tonsillar fossa. After exiting the jugular foramen, it descends between the internal carotid artery and internal jugular vein, eventually passing deep to the styloid process and curving around the stylopharyngeus muscle to enter the pharynx. **Why Option A is correct:** The **tonsillectomy approach** (intraoral approach) is the preferred surgical route for glossopharyngeal neurectomy, particularly in cases of glossopharyngeal neuralgia refractory to medical management. After a standard tonsillectomy is performed, the nerve can be identified as it passes through the superior constrictor muscle or along the bed of the tonsillar fossa. This approach provides direct access to the peripheral portion of the nerve with minimal morbidity compared to external or intracranial routes. **Why other options are incorrect:** * **B. Transpalatal approach:** Primarily used for access to the nasopharynx or the skull base (e.g., juvenile nasopharyngeal angiofibroma); it does not provide adequate exposure to the lateral oropharyngeal wall where CN IX is located. * **C. Transmandibular approach:** A radical approach (mandibular swing) used for large tumors of the base of the tongue or oropharynx. It is far too invasive for a simple neurectomy. * **D. Transpharyngeal approach:** While the nerve is in the pharyngeal area, "transpharyngeal" is a vague term; the specific surgical corridor is via the tonsillar bed. **Clinical Pearls for NEET-PG:** * **Glossopharyngeal Neuralgia:** Characterized by paroxysmal, lancinating pain in the ear, base of tongue, and tonsillar fossa, often triggered by swallowing or talking. * **Eagle’s Syndrome:** An elongated styloid process can compress CN IX, causing similar symptoms. The surgical treatment is a styloidectomy, often performed via the same **tonsillectomy approach**. * **Nerve Identification:** During tonsillectomy, the glossopharyngeal nerve is the most common nerve at risk of injury in the tonsillar bed, which can lead to loss of taste on the posterior 1/3 of the tongue.

Question 15: Conley's Pointer is used to identify which of the following nerves?

A. The Lingual Nerve
B. The Hypoglossal Nerve
C. The Facial Nerve (Correct Answer)
D. All the above

Explanation: **Explanation:** **Conley’s Pointer** (also known as the **Tragal Pointer**) is a critical anatomical landmark used during parotid surgery to identify the **Facial Nerve (CN VII)**. The pointer is the deep, triangular extension of the auricular cartilage of the meatus. The main trunk of the facial nerve is typically located approximately **1.0 to 1.5 cm deep and slightly anterior-inferior** to the tip of this pointer. Identifying the nerve at this exit point from the stylomastoid foramen is the safest way to begin a superficial parotidectomy to avoid accidental nerve injury. **Analysis of Options:** * **The Lingual Nerve (Option A):** This nerve is found in the submandibular region and floor of the mouth. It is identified during submandibular gland excision, not via the tragal pointer. * **The Hypoglossal Nerve (Option B):** This nerve is located deep to the posterior belly of the digastric muscle in the carotid triangle. While it is a landmark in neck dissections, Conley’s pointer is not used for its localization. * **The Facial Nerve (Option C):** Correct. Conley's pointer is one of the five standard landmarks for the facial nerve trunk. **High-Yield Clinical Pearls for NEET-PG:** Other essential landmarks to identify the Facial Nerve trunk include: 1. **Tympanomastoid Suture Line:** The nerve is located 6–8 mm deep to this suture. 2. **Posterior Belly of Digastric Muscle:** The nerve lies just superior to where the muscle attaches to the mastoid notch. 3. **Styloid Process:** The nerve is usually found lateral to the styloid process. 4. **Luschka’s Nerve:** A small branch of the post-auricular artery that bleeds near the nerve trunk (the "bell-ringer’s artery").

Question 16: The subcapsular plexus of lymphatics from the thyroid gland drains into which of the following anatomical levels of lymph nodes?

A. Level I
B. Level III
C. Level VII
D. Level VI (Correct Answer)

Explanation: ### Explanation **1. Why Level VI is Correct:** The thyroid gland is located in the anterior compartment of the neck. Its primary lymphatic drainage follows a predictable pattern: the **subcapsular plexus** of the thyroid first drains into the **Level VI (Anterior Compartment)** lymph nodes. These include the **prelaryngeal (Delphian)**, **pretracheal**, and **paratracheal** nodes. Because Level VI nodes are the closest anatomical neighbors to the thyroid, they are considered the "first-station" or sentinel nodes for thyroid malignancies (especially papillary thyroid carcinoma). **2. Why Other Options are Incorrect:** * **Level I (Submental/Submandibular):** These nodes drain the lip, oral cavity, and submandibular gland. They are not part of the primary drainage pathway for the thyroid. * **Level III (Middle Jugular):** While the thyroid can drain to the deep cervical chain (Levels II, III, and IV), this is usually secondary to Level VI drainage or occurs via lateral lymphatic channels. Level VI remains the primary immediate site. * **Level VII (Superior Mediastinal):** These nodes are located below the suprasternal notch. While thyroid cancer can extend here (especially from the lower pole), it is considered a secondary progression rather than the primary subcapsular drainage site. **3. Clinical Pearls for NEET-PG:** * **Delphian Node:** A prelaryngeal node in Level VI. If palpable, it may indicate laryngeal cancer or metastatic thyroid cancer (ominous sign). * **Skip Metastasis:** In rare cases, thyroid cancer can skip Level VI and present directly in Level II or III; however, Level VI remains the standard answer for primary drainage. * **Surgical Note:** A "Central Neck Dissection" specifically refers to the removal of Level VI lymph nodes. * **Most Common Site of Metastasis:** For Papillary Carcinoma of the Thyroid, Level VI is the most common site of nodal involvement.

Question 17: Supraomohyoid neck dissection includes removal of which lymph node levels?

A. Level I - IV Lymph nodes
B. Level II - V Lymph nodes
C. Level I - III Lymph nodes (Correct Answer)
D. Level II - IV Lymph nodes

Explanation: **Explanation:** **1. Understanding Supraomohyoid Neck Dissection (SOHND):** Supraomohyoid neck dissection is a type of **Selective Neck Dissection (SND)**. By definition, a selective neck dissection involves the removal of specific lymph node groups based on the predictable patterns of lymphatic spread from a primary tumor. In SOHND, the dissection is limited to the nodes located above the **omohyoid muscle**. This specifically includes **Levels I, II, and III**. It is most commonly performed for N0 (clinically negative) necks in patients with squamous cell carcinoma of the **oral cavity**, as these levels are the primary "first-echelon" drainage sites for the tongue, floor of mouth, and gingiva. **2. Analysis of Incorrect Options:** * **Option A (I-IV):** This is known as an **Extended Supraomohyoid Neck Dissection** or an Anterolateral Neck Dissection. Level IV is typically included for cancers of the oropharynx or hypopharynx, but not in a standard SOHND. * **Option B (II-V):** This does not correspond to a standard selective dissection for oral cavity tumors. Level V (posterior triangle) is usually preserved unless there is evidence of metastasis or if performing a Modified Radical Neck Dissection (MRND). * **Option D (II-IV):** This is known as a **Lateral Neck Dissection**, typically used for primary tumors of the larynx, oropharynx, or hypopharynx, where Level I is usually spared. **3. High-Yield Clinical Pearls for NEET-PG:** * **Boundaries of SOHND:** Superiorly by the body of the mandible; Posteriorly by the posterior border of the SCM; Inferiorly by the intermediate tendon of the omohyoid muscle. * **Structures Preserved:** In all selective neck dissections (including SOHND), the Spinal Accessory Nerve (CN XI), Internal Jugular Vein (IJV), and Sternocleidomastoid muscle (SCM) are **preserved**. * **Radical Neck Dissection (RND):** Includes Levels I-V plus removal of CN XI, IJV, and SCM. * **Modified Radical Neck Dissection (MRND):** Includes Levels I-V but preserves one or more of the non-lymphatic structures (CN XI, IJV, or SCM).

Question 18: When a patient's chin and mandible deviate to the right upon opening, which of the following is a possible cause?

A. Hyperplasia of the right condyle
B. Fracture of the left condyle
C. Ankylosis of the left condyle
D. Hypoplasia of the right condyle (Correct Answer)

Explanation: **Explanation:** The movement of the mandible is governed by the bilateral Temporomandibular Joints (TMJ) and the lateral pterygoid muscles. In a healthy individual, symmetrical forward translation of both condyles results in a straight downward opening of the mouth. **Why Hypoplasia of the right condyle is correct:** In cases of **hypoplasia or ankylosis**, there is a mechanical restriction or a lack of growth on the affected side. When the patient opens their mouth, the healthy (left) condyle translates forward normally, while the underdeveloped or restricted (right) condyle remains relatively stationary. This creates a "pivot" effect, causing the mandible to **deviate toward the side of the lesion**. Therefore, right-sided hypoplasia causes right-sided deviation. **Analysis of Incorrect Options:** * **A. Hyperplasia of the right condyle:** Excessive growth on the right side would push the mandible away from the lesion, causing deviation to the **left**. * **B. Fracture of the left condyle:** In a unilateral fracture, the lateral pterygoid on the fractured side loses its function. The intact right side would push the mandible toward the injured side, causing **left-sided** deviation. * **C. Ankylosis of the left condyle:** Similar to hypoplasia, the mandible deviates toward the restricted side. Left-sided ankylosis would cause **left-sided** deviation. **Clinical Pearls for NEET-PG:** * **Rule of Thumb:** The mandible always "laps up the lesion" (deviates toward the side of weakness/restriction). * **Lateral Pterygoid Function:** This is the only muscle of mastication that opens the mouth (by depressing the mandible). * **Nerve Injury:** In a **Trigeminal nerve (CN V3)** palsy, the mandible deviates **toward** the side of the lesion due to paralysis of the ipsilateral lateral pterygoid. * **Comparison:** Contrast this with **Hypoglossal nerve (CN XII)** injury, where the tongue deviates **toward** the side of the lesion, and **Vagus nerve (CN X)** injury, where the uvula deviates **away** from the lesion.

Question 19: Removal of only Level VI lymph nodes is called as:

A. Type 3 Modified radical neck dissection
B. Central neck dissection (Correct Answer)
C. Functional neck dissection
D. Supraomohyoid neck dissection

Explanation: ### Explanation **Correct Answer: B. Central neck dissection** **Concept:** The neck is divided into various levels (I to VII) for surgical and oncological classification. **Level VI** is known as the **Central Compartment**. It is bounded superiorly by the hyoid bone, inferiorly by the suprasternal notch, and laterally by the common carotid arteries. Removal of lymph nodes in this specific region (pre-laryngeal, pre-tracheal, and para-tracheal nodes) is termed a **Central Neck Dissection**. This procedure is most commonly performed for thyroid malignancies (especially papillary thyroid carcinoma). **Why other options are incorrect:** * **Type 3 Modified Radical Neck Dissection (MRND):** This involves the removal of lymph node levels I through V while preserving all three non-lymphatic structures (Internal Jugular Vein, Sternocleidomastoid muscle, and Spinal Accessory nerve). It is much more extensive than a Level VI dissection. * **Functional Neck Dissection:** This is a clinical term often used synonymously with MRND. It implies a systematic removal of lymph node levels I-V while preserving non-lymphatic structures to maintain function. * **Supraomohyoid Neck Dissection (SOHND):** This is a type of **Selective Neck Dissection** that involves the removal of levels **I, II, and III** only. It is typically performed for oral cavity cancers. **High-Yield Clinical Pearls for NEET-PG:** * **Level VI Boundaries:** Hyoid (Superior), Suprasternal notch (Inferior), Carotids (Lateral). * **Delphian Node:** A specific node in Level VI (pre-laryngeal) that, if involved, often indicates subglottic or thyroid cancer spread. * **Level VII:** Refers to the superior mediastinal lymph nodes (below the suprasternal notch). * **Radical Neck Dissection (RND):** Removal of levels I-V + IJV + SCM + Spinal Accessory Nerve.

Question 20: A 12-year-old patient presents with midline neck swelling, which moves upwards during protrusion of tongue. What is the most common site for this condition?

A. Suprahyoid
B. Subhyoid (Correct Answer)
C. Beneath the foramen cecum
D. Floor of mouth

Explanation: ***Subhyoid*** - This presentation describes a **thyroglossal duct cyst**, characterized by a **midline neck swelling** that moves with **tongue protrusion**. - The most common location for these cysts, representing approximately 65% of cases, is **subhyoid** or just below the hyoid bone. *Suprahyoid* - While thyroglossal duct cysts can occur suprahyoid (above the hyoid bone), this is less common than the subhyoid location. - Suprahyoid cysts account for about 20% of cases. *Beneath the foramen cecum* - The **foramen cecum** is the origin of the thyroglossal duct at the base of the tongue, and cysts forming here are very rare. - Cysts in this location would typically manifest as a mass at the base of the tongue, rather than a prominent neck swelling. *Floor of mouth* - Cysts in the **floor of the mouth** are usually **ranulas** or **dermoid cysts**, and do not typically move with tongue protrusion in the same manner as a thyroglossal duct cyst. - While some rare thyroglossal duct cysts can have an intraoral component, their primary presentation is not usually exclusively in the floor of the mouth.

Practice by Chapter

Neck Spaces and Fasciae

Practice Questions

Congenital Neck Lesions

Practice Questions

Neck Masses: Differential Diagnosis

Practice Questions

Thyroid Nodules and Cancer

Practice Questions

Parathyroid Disorders

Practice Questions

Cervical Lymphadenopathy

Practice Questions

Neck Dissection Principles

Practice Questions

Deep Neck Space Infections

Practice Questions

Carotid Body Tumors

Practice Questions

Reconstruction Principles in Head and Neck

Practice Questions

Management of Head and Neck Cancer

Practice Questions

Complications in Head and Neck Surgery

Practice Questions

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