Head and Neck Surgery Practice Questions

Q: A child presents with a midline swelling beneath the hyoid bone. What is the most likely diagnosis for this swelling?

Thyroglossal cyst. ### Explanation **Correct Option: A. Thyroglossal cyst** The **Thyroglossal cyst** is the most common congenital midline neck swelling in children. It develops from a persistent segment of the thyroglossal duct, which marks the path of the thyroid gland's descent from the foramen caecum (base of tongue) to its final position in the neck. * **Location:** It can occur anywhere along this tract, but the most common site is **infrahyoid (beneath the hyoid bone)**. * **Clinical Hallmark:** Because the duct is anatomically connected to the hyoid bone and the base of the tongue, the cyst characteristically **moves upward on protrusion of the tongue** and on deglutition (swallowing). **Why other options are incorrect:** * **B. Sternocleidomastoid tumor:** Also known as "Congenital Torticollis" or "pseudotumor of infancy," this presents as a firm, non-tender mass within the body of the sternocleidomastoid muscle. It is **lateral** in position, not midline, and is often associated with a head tilt. * **C & D:** These are incorrect based on the classic midline presentation described. **High-Yield Clinical Pearls for NEET-PG:** * **Sistrunk Operation:** The definitive surgical treatment. It involves the excision of the cyst, the entire tract, and the **central part of the hyoid bone** to minimize the high risk of recurrence. * **Differential Diagnosis:** A midline swelling in a child could also be a **Dermoid cyst**, but unlike a thyroglossal cyst, a dermoid cyst does *not* move with tongue protrusion. * **Ectopic Thyroid:** Always perform an ultrasound before surgery to ensure the "cyst" isn't the patient's only functioning thyroid tissue.

Q: 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?

T1 N0 M0. ### 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.

Q: A tooth that is impacted mesioangularly, in class 2, position C has a difficulty index of:

6. The difficulty of extracting an impacted mandibular third molar is assessed using the **Pell and Gregory Classification** and the **Winter’s Classification**, which are combined into the **Modified Parant Scale (Difficulty Index)**. ### **Calculation for the Difficulty Index:** The total score is the sum of three parameters: 1. **Winter’s Classification (Angulation):** * Mesioangular: **1 point** (Least difficult) * Horizontal/Distoangular: 2 points * Vertical: 3 points 2. **Pell & Gregory Relationship to Ramus (Class):** * Class 1: 1 point * **Class 2:** **2 points** (Space less than the mesiodistal width of the crown) * Class 3: 3 points 3. **Pell & Gregory Depth (Position):** * Position A: 1 point * Position B: 2 points * **Position C:** **3 points** (Highest point of the tooth is below the cervical line of the second molar) **Total Score:** 1 (Mesioangular) + 2 (Class 2) + 3 (Position C) = **6**. ### **Analysis of Options:** * **Option A (2):** Incorrect. This would represent a very simple extraction (e.g., Mesioangular, Class 1, Position A). * **Option C (5):** Incorrect. This misses one point in the cumulative grading of the three variables. * **Option B (8):** Incorrect. A score of 7–10 indicates "Very High Difficulty." This specific combination does not reach that threshold. ### **Clinical Pearls for NEET-PG:** * **Difficulty Grading:** 3–4 (Mild), 5–7 (Moderate), 8–10 (Severe). * **Most Common Angulation:** Mesioangular (also the easiest to extract). * **Most Difficult Angulation:** Distoangular (due to the path of withdrawal into the ramus). * **Key Landmark:** Position C is the most difficult because the tooth is completely encased in bone, requiring significant osteotomy.

Q: If retromolar pad and tuberosity contact, what should be done?

Surgical reduction of tuberosity. **Explanation:** The goal of pre-prosthetic surgery is to create an optimal environment for denture stability, retention, and support. The **retromolar pad** (mandible) and the **maxillary tuberosity** (maxilla) are critical landmarks for denture extension. **1. Why Option A is Correct:** For a complete denture to be successful, there must be adequate **inter-arch distance** (inter-ridge space) to accommodate the denture bases and artificial teeth. If the maxillary tuberosity and the retromolar pad are in contact (or have insufficient clearance), there is no room for the denture material. **Surgical reduction of the tuberosity** (either bony or fibrous tissue) is the standard procedure to create the necessary vertical space without compromising the mandibular anatomy, which is often more prone to resorption. **2. Why Other Options are Wrong:** * **Option B:** The retromolar pad is a primary stress-bearing area and provides a peripheral seal for the mandibular denture. Failing to extend the denture here leads to poor stability and rapid ridge resorption. * **Option C:** Denture fabrication is possible, but only after corrective surgery to create the required restorative space. * **Option D:** Contact between these structures prevents the patient from closing into centric occlusion with the dentures in place, leading to constant displacement and pain. **Clinical Pearls for NEET-PG:** * **Inter-arch distance:** Ideally, 10–12 mm of space is required for both arches. * **Retromolar Pad:** It contains glandular tissue, fibers of the buccinator, and the pterygomandibular raphe; it does not resorb and serves as a key landmark for the occlusal plane. * **Pendulous Tuberosity:** Often caused by fibrous hyperplasia; if it interferes with the "Hamular Notch" seal or vertical space, surgical excision (Elliptical incision) is indicated.

Q: A 2-year-old child presents with a brilliantly translucent swelling in the neck region. What is the most likely diagnosis?

Cystic hygroma. **Explanation:** The correct answer is **Cystic hygroma**. The clinical presentation of a **brilliantly translucent** swelling in a child’s neck is a classic hallmark of this condition. **1. Why Cystic Hygroma is Correct:** Cystic hygroma (also known as macrocystic lymphatic malformation) is a congenital malformation of the lymphatic system where lymph vessels fail to connect with the venous system. This results in large, fluid-filled sacs. Because these cysts contain clear, straw-colored lymph and have very thin walls, they demonstrate **brilliant transillumination**. They are most commonly found in the posterior triangle of the neck and are typically present at birth or manifest by age two. **2. Why Other Options are Incorrect:** * **Lipoma:** While soft and painless, lipomas are composed of fat and are **not translucent**. They are also relatively rare in early childhood. * **Teratoma:** These are solid or mixed germ cell tumors. Due to their dense, multi-tissue composition (hair, teeth, muscle), they are **opaque** on transillumination. * **Thyroglossal Cyst:** These occur in the midline of the neck and move with protrusion of the tongue. While they are cystic, they are usually **not translucent** because they contain mucoid material or debris. **Clinical Pearls for NEET-PG:** * **Pathognomonic Sign:** "Brilliant transillumination" is the single most important clue for Cystic Hygroma. * **Association:** Frequently associated with chromosomal anomalies like **Turner Syndrome** (45, XO) and Down Syndrome. * **Complications:** Sudden increase in size usually indicates **hemorrhage** into the cyst or infection. * **Treatment:** Surgical excision is the gold standard; however, **Sclerotherapy** (using OK-432 or Bleomycin) is an effective non-surgical alternative.

Q: A patient has a 3 cm mass over the lower lip and a single lymph node measuring 3 cm was present on the contralateral side. What is the TNM staging of this lip carcinoma?

T2 N2c. ### **Explanation** The staging of Lip and Oral Cavity Carcinoma follows the AJCC (8th Edition) TNM classification. **1. T-Staging (Tumor Size):** * **T1:** Tumor ≤ 2 cm in greatest dimension. * **T2:** Tumor > 2 cm but ≤ 4 cm. * **T3:** Tumor > 4 cm. * In this case, the mass is **3 cm**, which classifies it as **T2**. **2. N-Staging (Nodal Involvement):** * **N1:** Single ipsilateral node ≤ 3 cm. * **N2a:** Single ipsilateral node > 3 cm but ≤ 6 cm. * **N2b:** Multiple ipsilateral nodes, none > 6 cm. * **N2c:** Bilateral or **contralateral** lymph nodes, none > 6 cm. * Since the patient has a **single 3 cm node on the contralateral side**, it is classified as **N2c**. Combining these gives the stage **T2 N2c**. --- ### **Why Incorrect Options are Wrong:** * **Option A (T1 N2a):** Incorrect because the tumor is > 2 cm (T2) and the node is contralateral (N2c), not ipsilateral (N2a). * **Option B (T2 N2b):** While the T-stage is correct, N2b refers to multiple ipsilateral nodes. Contralateral involvement automatically upgrades the N-stage to N2c. * **Option D (T1 N2b):** Incorrect on both counts; the size is T2 and the nodal distribution is N2c. --- ### **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Site:** The lower lip is the most common site for lip cancer (usually Squamous Cell Carcinoma) due to sun exposure. * **Prognosis:** Lip cancer has a better prognosis than intraoral SCC because it is detected earlier. * **AJCC 8th Ed. Update:** For oral cavity (not lip), **Depth of Invasion (DOI)** is now a critical component of T-staging (T1 ≤ 5mm, T2 > 5mm to 10mm, T3 > 10mm). * **N-Stage Note:** Any node > 6 cm is classified as **N3**. Presence of **Extranodal Extension (ENE)** significantly upgrades the N-stage in the 8th edition.

Q: Which statement is not true regarding carcinoma of the tongue?

It is commonly an adenocarcinoma.. **Explanation:** **1. Why Option C is the correct answer (The False Statement):** The oral cavity, including the tongue, is lined by stratified squamous epithelium. Therefore, the most common histological type of tongue cancer (accounting for >90% of cases) is **Squamous Cell Carcinoma (SCC)**, not adenocarcinoma. Adenocarcinomas are rare in the tongue and usually arise from minor salivary glands located in the base of the tongue. **2. Analysis of Incorrect Options (True Statements):** * **Option A:** The **lateral border** of the anterior two-thirds of the tongue is indeed the most common site for carcinoma, often due to chronic irritation from sharp teeth or tobacco contact. * **Option B:** The tongue has a very rich lymphatic drainage that crosses the midline. **Cervical lymph node metastasis** is frequent and often occurs early (especially to Level II/Jugulodigastric nodes), which significantly impacts the prognosis. * **Option D:** Chronic irritation from **tobacco chewing**, smoking, and betel nut (paan) are the primary etiological factors for oral malignancies in the Indian subcontinent. **3. High-Yield Clinical Pearls for NEET-PG:** * **Premalignant Lesions:** Erythroplakia (highest risk) and Leukoplakia are significant precursors. * **Staging:** The "T" in TNM staging for the oral cavity is determined by the maximum diameter of the tumor and the **Depth of Invasion (DOI)**. * **Plummer-Vinson Syndrome:** Associated with an increased risk of post-cricoid and tongue base carcinoma. * **Field Cancerization:** This concept explains why patients with one oral primary are at high risk for developing a second primary tumor in the upper aerodigestive tract.

Q: What is a cystic compressible, translucent swelling typically found in the posterior triangle of the neck?

Cystic hygroma. ### Explanation **Cystic Hygroma (Correct Answer)** A cystic hygroma is a congenital malformation of the lymphatic system (lymphangioma) where lymph sacs fail to communicate with the venous system. * **Location:** Most commonly found in the **posterior triangle** of the neck (80% of cases). * **Clinical Features:** It is characteristically **soft, cystic, compressible, and painless**. * **Pathognomonic Sign:** Because it contains clear lymph and has thin walls, it is **brilliantly translucent**. It often exhibits a "cross-fluctuation" sign due to its multilocular nature. **Why the others are incorrect:** * **Branchial Cyst:** Typically located at the junction of the upper 1/3rd and lower 2/3rds of the **anterior border of the sternocleidomastoid muscle**. It is usually opaque (not translucent) and contains cholesterol crystals in the fluid. * **Thyroglossal Cyst:** Found in the **midline** of the neck, usually below the hyoid bone. Its hallmark feature is that it **moves upward on protrusion of the tongue** and deglutition. * **Dermoid Cyst:** Also found in the midline (submental region). It is a "doughy" feeling, opaque swelling that does not transilluminate. **High-Yield Clinical Pearls for NEET-PG:** * **Association:** Cystic hygromas are frequently associated with chromosomal anomalies, most notably **Turner Syndrome** (45, XO) and Down Syndrome. * **Complications:** Sudden increase in size usually indicates **intracystic hemorrhage** or infection. * **Treatment of Choice:** Surgical excision is preferred. For unresectable cases, sclerotherapy (e.g., **OK-432** or Bleomycin) is used. * **Radiology:** On USG/MRI, it appears as a multilocular cystic mass with internal septations.

Question 1

A child presents with a midline swelling beneath the hyoid bone. What is the most likely diagnosis for this swelling?

Accepted Answer

Thyroglossal cyst

Answer

Sternocleidomastoid tumor

Answer

Both of the above

Answer

None of the above

Question 2

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?

Accepted Answer

T1 N0 M0

Answer

T1 N1 M0

Answer

T1 N2 M0

Answer

T2 N0 M0

Question 3

A tooth that is impacted mesioangularly, in class 2, position C has a difficulty index of:

Accepted Answer

6

Answer

2

Answer

8

Answer

5

Question 4

If retromolar pad and tuberosity contact, what should be done?

Accepted Answer

Surgical reduction of tuberosity

Answer

Do not extend dentures to the retromolar area

Answer

Denture fabrication is not possible

Answer

Has no effect on the denture

Question 5

Clicking jaw is due to:

Accepted Answer

Lax temporomandibular joint

Answer

Fracture of the mandible

Answer

Fracture of the maxilla

Answer

Dislocation of the symphysis menti

Question 6

A 2-year-old child presents with a brilliantly translucent swelling in the neck region. What is the most likely diagnosis?

Accepted Answer

Cystic hygroma

Answer

Lipoma

Answer

Teratoma

Answer

Thyroglossal cyst

Question 7

A patient has a 3 cm mass over the lower lip and a single lymph node measuring 3 cm was present on the contralateral side. What is the TNM staging of this lip carcinoma?

Accepted Answer

T2 N2c

Answer

T1 N2a

Answer

T2 N2b

Answer

T1 N2b

Question 8

Which statement is not true regarding carcinoma of the tongue?

Accepted Answer

It is commonly an adenocarcinoma.

Answer

Lateral border is commonly involved.

Answer

Cervical lymph node involvement is frequent.

Answer

Tobacco chewing is a significant risk factor.

Question 9

What is a cystic compressible, translucent swelling typically found in the posterior triangle of the neck?

Accepted Answer

Cystic hygroma

Answer

Branchial cyst

Answer

Thyroglossal cyst

Answer

Dermoid cyst

Question 10

All are true about Cancrum Oris except?

Accepted Answer

Follows chronic infection

Answer

Involves the jaw

Answer

Associated with malnutrition and vitamin deficiency

Answer

Treatment is excision and skin grafting

Head and Neck Surgery — MCQs

Head and Neck Surgery — MCQs

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