Head and Neck Surgery Practice Questions

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

Pleomorphic adenoma. **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.

Q: What is characteristic of carcinoma of the lip?

It occurs mostly on the lower lip.. **Explanation:** Carcinoma of the lip is a common head and neck malignancy, primarily presenting as **Squamous Cell Carcinoma (SCC)**. **1. Why the Correct Answer is Right:** * **Option C (Lower Lip):** Approximately **90% of lip cancers occur on the lower lip**. This is primarily due to chronic cumulative exposure to ultraviolet (UV) radiation from sunlight. Because of the anatomical protrusion and angle of the face, the lower lip receives significantly more direct sun exposure than the upper lip. **2. Why the Other Options are Incorrect:** * **Option A:** Lip cancer occurs predominantly in **males** (ratio approx. 10:1), largely due to higher rates of outdoor occupations (sun exposure) and tobacco use (smoking/chewing). * **Option B:** Lip cancer is generally considered to have a **favorable prognosis** because it grows slowly and metastasizes late. Only about 5–10% of cases involve regional lymph node metastasis (usually to Submental or Submandibular nodes) at the time of diagnosis. * **Option D:** The most common histological type is **Squamous Cell Carcinoma (SCC)**. While Basal Cell Carcinoma (BCC) can occur, it more commonly affects the **upper lip** (often spreading from the adjacent skin). **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Chronic sun exposure (UVB), pipe smoking, and immunosuppression. * **Staging:** Follows the TNM system for the oral cavity. * **Management:** Small lesions are treated with surgical excision (V-excision or Shield excision) or radiotherapy with equal efficacy. * **Prognosis:** The lower lip has a better prognosis than the upper lip or the oral commissure. * **Field Cancerization:** Patients are at risk for synchronous or metachronous lesions in the oral cavity.

Q: What is the most common lesion of the mandible?

Ameloblastoma. **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.

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

Micrognathia. **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).

Q: A 45-year-old man presents with progressive cervical lymph node enlargement for the past 3 months. What is the most diagnostic investigation?

Lymph node biopsy. **Explanation:** In the evaluation of persistent cervical lymphadenopathy (lasting >3-4 weeks), establishing a definitive tissue diagnosis is crucial to differentiate between reactive hyperplasia, chronic infections (like Tuberculosis), and malignancies (Lymphoma or Metastatic Squamous Cell Carcinoma). **Why Lymph Node Biopsy is the Correct Answer:** Excisional lymph node biopsy is considered the **gold standard** and the most diagnostic investigation. Unlike cytology, a biopsy preserves the **nodal architecture**, which is essential for diagnosing lymphomas (to differentiate Hodgkin’s vs. Non-Hodgkin’s and determine grading). It also provides sufficient tissue for immunohistochemistry (IHC) and molecular studies, which are vital for identifying the primary site in cases of occult malignancy. **Analysis of Incorrect Options:** * **A. X-ray of soft tissues:** This provides no information regarding the internal morphology or cellular nature of the node. It is non-specific and largely obsolete for primary diagnosis. * **B. Fine Needle Aspiration Cytology (FNAC):** While FNAC is often the *initial* investigation of choice due to its speed and low cost, it is not the most diagnostic. It provides only cellular detail (cytology) and lacks architectural context, often leading to false negatives in lymphoma. **High-Yield Clinical Pearls for NEET-PG:** * **Initial Investigation:** FNAC. * **Gold Standard/Most Diagnostic:** Excisional Biopsy. * **Biopsy Selection:** If multiple nodes are present, the largest, deepest, and most suspicious node should be sampled. Avoid the uppermost (submandibular) nodes if possible, as they often show chronic inflammatory changes. * **Rule of Thumb:** Any node >1 cm persisting for more than 4 weeks without a clear infectious cause requires a definitive tissue diagnosis.

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.

Question 1

What is the most common benign tumor of the salivary gland?

Accepted Answer

Pleomorphic adenoma

Answer

Mucoepidermoid tumor

Answer

Warthin's tumor

Answer

Acinic cell tumor

Question 2

All of the following are true about carcinoma of the lip except?

Accepted Answer

If 1/3rd or less of the lip is involved, an Abbe-Estlander flap is used for reconstruction.

Answer

Non-healing ulcer or growth is the most common presentation.

Answer

The most common site is the vermillion of the lower lip.

Answer

The Abbe-Estlander flap is based on the superior labial artery.

Question 3

What is characteristic of carcinoma of the lip?

Accepted Answer

It occurs mostly on the lower lip.

Answer

It occurs mostly in females.

Answer

It metastasizes easily.

Answer

It is mostly of the basal cell type.

Question 4

What is the most common lesion of the mandible?

Accepted Answer

Ameloblastoma

Answer

Squamous cell carcinoma

Answer

Osteosarcoma

Answer

Osteoclastoma

Question 5

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

Accepted Answer

Micrognathia

Answer

Glossoptosis

Answer

High arched palate

Answer

Cleft palate

Question 6

According to the Hippocrates-Nelson method, what pressure is applied for the reduction of a dislocated mandible?

Accepted Answer

Both downward pressure on molars and backward pressure on the mandible.

Answer

Downward pressure on molars.

Answer

Backward pressure on the mandible.

Answer

Downward pressure on the mandible.

Question 7

A 45-year-old man presents with progressive cervical lymph node enlargement for the past 3 months. What is the most diagnostic investigation?

Accepted Answer

Lymph node biopsy

Answer

X-ray of soft tissues

Answer

Fine Needle Aspiration Cytology (FNAC)

Answer

None of the above

Question 8

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 9

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 10

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

Head and Neck Surgery — MCQs

Head and Neck Surgery — MCQs

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