Head and Neck Surgery Practice Questions

Q: Which structure is injured during the excision of a ranula?

Submandibular duct. **Explanation:** A **ranula** is a clinical term for a mucous extravasation cyst or a mucous retention cyst occurring specifically in the floor of the mouth. It typically arises from the **sublingual gland**. **Why the Submandibular Duct is the Correct Answer:** The submandibular duct (Wharton’s duct) runs along the floor of the mouth, passing from lateral to medial and crossing the lingual nerve. During the surgical excision or marsupialization of a ranula, the duct is at high risk of injury because it lies in the immediate surgical field, often draped over or compressed by the cyst. Damage to this duct can lead to obstructive sialadenitis of the submandibular gland. **Analysis of Incorrect Options:** * **A. Parotid duct (Stensen’s duct):** This duct opens opposite the second upper molar tooth in the buccal mucosa. It is anatomically distant from the floor of the mouth where a ranula is located. * **B. Facial artery:** While the facial artery is closely related to the submandibular gland, it runs deep to the mandible and through the submandibular triangle. It is not encountered during the intra-oral excision of a superficial ranula. * **C. Lingual nerve:** Although the lingual nerve is in the floor of the mouth, it lies deeper and more medial/inferior to the submandibular duct in this specific region. While it is at risk in deep dissections (like a "Plunging Ranula"), the submandibular duct is the structure most intimately related to the cyst wall. **High-Yield Clinical Pearls for NEET-PG:** * **Source:** Most ranulas arise from the **sublingual gland** (specifically the glands of Rivinus). * **Plunging Ranula:** A clinical variant that herniates through the **mylohyoid muscle** to present as a swelling in the neck. * **Treatment of Choice:** Complete excision of the ranula along with the **offending sublingual gland** to prevent recurrence. Marsupialization has a higher recurrence rate.

Q: Elevators should not be used to remove the palatal root of an?

Upper molar. **Explanation:** The use of elevators for the extraction of the palatal root of an **upper molar** is contraindicated due to the specific anatomical relationship between the maxillary molars and the **maxillary sinus (antrum)**. The palatal root of the upper molar is often long, divergent, and located in close proximity to the floor of the maxillary sinus. Applying apical force with an elevator in this region carries a high risk of displacing the root fragment into the sinus cavity, leading to complications such as **oro-antral communication (OAC)** or acute sinusitis. Instead of elevators, specialized root forceps or a surgical approach (creating a flap) are preferred to ensure controlled retrieval. **Analysis of Incorrect Options:** * **Upper Incisors (A) and Canines (B):** These are single-rooted teeth. While elevators are used cautiously, there is no maxillary sinus involvement in the anterior maxilla to pose a displacement risk similar to molars. * **Upper Premolars (C):** Although the second premolar is close to the sinus, the risk is significantly lower than with the three-rooted upper molars, where the palatal root is specifically angled toward the antral floor. **Clinical Pearls for NEET-PG:** * **Maxillary Sinus Proximity:** The first molar is the tooth most commonly associated with the maxillary sinus. * **Complication:** If a root is displaced into the sinus, the initial management involves a radiograph to locate it; if it cannot be retrieved via the socket, a **Caldwell-Luc procedure** may be required. * **Rule of Thumb:** Never apply apical pressure to a root tip that lacks a bony "stop" or is adjacent to a vital cavity (sinus or mandibular canal).

Q: True about branchial cyst?

Filled with straw colored fluid with cholesterol crystals. **Explanation:** Branchial cysts are congenital developmental defects arising from the persistence of the **second branchial cleft** (95% of cases). **Why Option C is correct:** The cyst is lined by stratified squamous epithelium (or sometimes columnar epithelium). The characteristic fluid within the cyst is **straw-colored** and contains **cholesterol crystals**. These crystals are derived from the breakdown of desquamated epithelial cells within the lymphoid-rich wall. On microscopy, these crystals appear as "rhomboid-shaped" plates with notched corners, which is a pathognomonic finding on Fine Needle Aspiration Cytology (FNAC). **Analysis of Incorrect Options:** * **Option A:** Branchial cysts are typically located at the junction of the **upper 1/3 and middle 1/3** of the anterior border of the sternocleidomastoid muscle, not the lower 1/3. * **Option B:** While the wall contains subepithelial lymphoid follicles (which can lead to enlargement during URTI), the wall itself is primarily composed of **epithelium** (squamous or columnar). * **Option D:** Although congenital, they rarely present at birth. They typically manifest in **late childhood or early adulthood** (2nd or 3rd decade) when the cyst enlarges due to infection or accumulation of fluid. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** "The classic site" is the anterior border of the sternocleidomastoid at the level of the **greater cornu of the hyoid bone**. * **Relation to Vessels:** It lies superficial to the bifurcation of the common carotid artery (between internal and external carotids). * **Differential Diagnosis:** Must be differentiated from a **Carotid Body Tumor** (which is pulsatile and has a positive Fontaine’s sign) and **Cystic Hygroma** (which transilluminates). * **Treatment:** Complete surgical excision (Stebbing’s operation) is the treatment of choice.

Q: Which lymph nodes are included in Level V of cervical lymph node classification?

Posterior triangle nodes. ### Explanation The cervical lymph node classification system (Memorial Sloan Kettering Cancer Center) divides the neck into six levels to standardize surgical and oncological communication. **1. Why the Correct Answer is Right:** **Level V** refers to the **Posterior Triangle nodes**. These are anatomically bounded anteriorly by the posterior border of the sternocleidomastoid (SCM) muscle, posteriorly by the anterior border of the trapezius muscle, and inferiorly by the clavicle. This level includes the spinal accessory nodes, transverse cervical nodes, and supraclavicular nodes. **2. Why the Other Options are Wrong:** * **Option A (Upper jugular nodes):** These constitute **Level II**. They extend from the skull base to the level of the hyoid bone (or carotid bifurcation). * **Option B (Middle jugular nodes):** These constitute **Level III**. They extend from the hyoid bone to the lower border of the cricoid cartilage (or omohyoid muscle). * **Option C (Lower jugular nodes):** These constitute **Level IV**. They extend from the cricoid cartilage down to the clavicle. **3. High-Yield Clinical Pearls for NEET-PG:** * **Level I:** Submental (Ia) and Submandibular (Ib) nodes. * **Level VI:** Anterior compartment nodes (pre-laryngeal, pre-tracheal, and para-tracheal). * **Level VII:** Superior mediastinal nodes (below the suprasternal notch). * **Boundary Landmark:** The **Spinal Accessory Nerve (CN XI)** passes through Level V; damage to it during neck dissection leads to "shoulder drop" and inability to shrug. * **Virchow’s Node:** A sentinel lymph node in the left supraclavicular fossa (part of Level V) often associated with gastric malignancy (Troisier’s sign).

Q: What is the most common site of palpable metastasis in the neck at the time of presentation?

Carcinoma of the tongue. **Explanation:** The correct answer is **Carcinoma of the Tongue**. This is primarily due to the tongue's rich lymphatic drainage and its constant muscular activity, which facilitates the early embolic spread of malignant cells to the regional lymph nodes. **Why Carcinoma of the Tongue is Correct:** Approximately **40–50%** of patients with squamous cell carcinoma (SCC) of the tongue present with palpable cervical lymphadenopathy at the time of diagnosis. The lateral borders and the posterior third (base) of the tongue have an extensive network of lymphatic vessels that drain directly into Level II (upper deep cervical) and Level III (middle deep cervical) nodes. Because the tongue is a highly mobile muscular organ, the "milking action" of swallowing and speaking promotes early metastasis. **Why the other options are incorrect:** * **Buccal Mucosa:** While common in India due to tobacco chewing, it generally has a lower incidence of early nodal metastasis (approx. 10–30%) compared to the tongue. * **Alveolus:** Carcinoma of the alveolus often presents with bone involvement (mandible/maxilla) before extensive lymphatic spread. * **Lip:** Carcinoma of the lip (usually the lower lip) is the least aggressive of the oral cavity cancers. It grows slowly and has a low rate of metastasis (approx. 5–10%) at presentation. **Clinical Pearls for NEET-PG:** * **Most common site of Oral Cancer in India:** Buccal Mucosa (due to *Khaini/Gutka*). * **Most common site of Oral Cancer Worldwide:** Lip (lower lip). * **Most common site of Nodal Metastasis:** Level II (Jugulodigastric node). * **TNM Staging:** The presence of a single ipsilateral node >3cm but ≤6cm is classified as **N2a**. * **Skip Metastasis:** Tongue cancers can sometimes skip Level I and go directly to Level III or IV.

Q: What is the most commonly encountered complication during the extraction of a maxillary third molar?

Fracture of the maxillary tuberosity. **Explanation:** The **fracture of the maxillary tuberosity** is considered the most common complication specifically associated with the extraction of the maxillary third molar. This occurs primarily due to the anatomical proximity of the third molar to the thin posterior wall of the maxilla and the tuberosity. **Why it is the correct answer:** The maxillary tuberosity is often weakened by a large maxillary sinus (pneumatization) or can be fused to the roots of the third molar (synostosis). During extraction, especially if the tooth is impacted or if excessive distal force is applied with elevators, the bone of the tuberosity is prone to fracturing away with the tooth. **Analysis of Incorrect Options:** * **A. Oro-antral communication:** While common in maxillary molar extractions, it is statistically less frequent than tuberosity fractures for the *third* molar specifically. It occurs more often when roots are widely divergent or deeply embedded in the sinus floor. * **B. Root displacement into the sinus:** This is a known complication but usually results from improper apical pressure during use of elevators. It is less common than a bony fracture of the alveolar housing. * **C. Excessive hemorrhage:** While bleeding occurs in all extractions, "excessive" hemorrhage is rare in routine third molar extractions unless there is an underlying coagulopathy or injury to the greater palatine artery. **Clinical Pearls for NEET-PG:** * **Management:** If a tuberosity fracture occurs and the fragment is small, it is removed with the tooth. If the fragment is large and attached to the periosteum, the extraction is aborted, and the tooth is splinted for 4–6 weeks to allow bony healing. * **Risk Factors:** Lone-standing maxillary molars, divergent roots, and hypercementosis. * **High-Yield Fact:** The **maxillary third molar** is the most common tooth to be displaced into the **infratemporal fossa**.

Question 1

Which structure is injured during the excision of a ranula?

Accepted Answer

Submandibular duct

Answer

Parotid duct

Answer

Facial artery

Answer

Lingual nerve

Question 2

A secretory sinus in the neck moves upon deglutition. What is the most likely diagnosis?

Accepted Answer

Thyroglossal fistula

Answer

Branchial sinus

Answer

Pilonidal cyst

Answer

Sublingual dermoid cyst

Question 3

Elevators should not be used to remove the palatal root of an?

Accepted Answer

Upper molar

Answer

Upper incisor

Answer

Upper canine

Answer

Upper premolar

Question 4

True about branchial cyst?

Accepted Answer

Filled with straw colored fluid with cholesterol crystals

Answer

Seen deep to lower 1/3 of sternocleidomastoid

Answer

Wall consists of lymphoid tissue

Answer

Presents at birth

Question 5

Which lymph nodes are included in Level V of cervical lymph node classification?

Accepted Answer

Posterior triangle nodes

Answer

Upper jugular nodes

Answer

Middle jugular nodes

Answer

Lower jugular nodes

Question 6

When a down fracture Le Fort I osteotomy is performed, which of the following is true?

Accepted Answer

A patient with a cleft palate is more likely to develop necrosis.

Answer

Necrosis is prevented by a blood supply to the maxilla from the palatine arteries.

Answer

The operation is easier on a cleft palate patient because the lesser segment does not have to be detached from the nose.

Answer

A tear in the nasal mucosa makes postoperative infection more likely.

Question 7

Blow out carotid is characteristically seen with:

Accepted Answer

Radical neck dissection

Answer

Thyroidectomy

Answer

Flap necrosis

Answer

Sistrunk operation

Question 8

What is the most common site of palpable metastasis in the neck at the time of presentation?

Accepted Answer

Carcinoma of the tongue

Answer

Buccal mucosa

Answer

Alveolus

Answer

Lip

Question 9

A patient presents with fractures in the symphysis and left angle regions of the mandible. What is the recommended treatment?

Accepted Answer

Two plates in the symphysis and one plate in the angle region

Answer

One plate in the symphysis and two plates in the angle region

Answer

One plate in each region

Answer

Intermaxillary fixation (IMF)

Question 10

What is the most commonly encountered complication during the extraction of a maxillary third molar?

Accepted Answer

Fracture of the maxillary tuberosity

Answer

Oro-antral communication

Answer

Root displacement into the sinus

Answer

Excessive hemorrhage

Head and Neck Surgery — MCQs

Head and Neck Surgery — MCQs

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