Head and Neck Surgery Practice Questions

Q: Which of the following orthognathic surgeries involves a horizontal cut in the ramus?

Sagittal Split Ramus Osteotomy (SSRO). **Explanation:** The **Sagittal Split Ramus Osteotomy (SSRO)** is the most versatile and commonly performed orthognathic procedure for correcting mandibular discrepancies (prognathism or retrognathism). The procedure involves three distinct bone cuts: 1. **Horizontal cut:** Made on the medial aspect of the ramus, superior to the mandibular foramen. 2. **Vertical cut:** Made on the lateral cortex, usually in the region of the second molar. 3. **Sagittal cut:** Connects the two, splitting the mandible into a tooth-bearing segment and a condyle-bearing segment. This allows for three-dimensional repositioning of the mandible. **Analysis of Incorrect Options:** * **Vertical Ramus Osteotomy (VRO):** This involves a vertical or slightly oblique cut from the sigmoid notch down to the lower border of the mandible. It is primarily used for mandibular setback and does not involve a horizontal ramus cut. * **Inverted L Osteotomy:** This involves a horizontal cut above the lingula followed by a vertical cut down to the inferior border. While it has a horizontal component, it is distinct from the "sagittal split" mechanism and is typically reserved for complex cases like hemifacial microsomia. * **Subapical Osteotomy:** This is a segmental surgery where the cut is made below the apices of the teeth (alveolar process) rather than in the ramus. It is used to move a specific segment of teeth and bone. **High-Yield Clinical Pearls for NEET-PG:** * **SSRO Advantage:** Provides excellent bone-to-bone contact, facilitating rapid healing and allowing for internal rigid fixation (no need for long-term intermaxillary fixation). * **Complication:** The most common complication of SSRO is **paresthesia of the lower lip** due to injury or traction on the Inferior Alveolar Nerve (IAN). * **Indication:** SSRO is the gold standard for **Mandibular Retrognathism** (advancement) and **Prognathism** (setback).

Q: Which carcinoma has the best prognosis?

Carcinoma of the Lip. **Explanation:** The prognosis of oral cavity carcinomas is primarily determined by the site’s lymphatic drainage, the timing of clinical presentation, and the histological grade. **Why Carcinoma of the Lip is the Correct Answer:** Carcinoma of the lip (specifically the lower lip, which accounts for 90% of cases) has the **best prognosis** among all oral cancers, with a 5-year survival rate exceeding 90%. This is due to: 1. **Early Detection:** Being an external site, lesions are visible early. 2. **Slow Growth:** Most are well-differentiated squamous cell carcinomas (SCC). 3. **Late Metastasis:** Lymphatic spread occurs late, usually to the submental or submandibular nodes. **Analysis of Incorrect Options:** * **Carcinoma of the Tongue (Option C):** This has the **worst prognosis** among the options. The tongue is highly muscular with rich lymphatic drainage (often bilateral/crossed), leading to early and aggressive nodal metastasis. * **Carcinoma of the Cheek (Buccal Mucosa) (Option B):** Common in India due to tobacco/betel nut chewing. While it has a fair prognosis, it often presents with trismus and can involve the buccinator muscle, making it more aggressive than lip cancer. * **Carcinoma of the Palate (Option D):** These are often minor salivary gland tumors or SCCs. Hard palate lesions can invade the palatine bone early, complicating the prognosis compared to the lip. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of Oral Cancer (Global):** Lip. * **Most common site of Oral Cancer (India):** Buccal Mucosa (due to "Ghutka" use). * **Lower Lip vs. Upper Lip:** Lower lip cancer is more common (UV exposure), but **Upper lip cancer** has a worse prognosis because it drains directly to pre-auricular nodes. * **Field Cancerization:** This concept (Slaughter’s hypothesis) is most frequently associated with oral cavity cancers, explaining the risk of synchronous or metachronous lesions.

Q: In cleft lip operation, on which day are all the stitches typically removed?

4th day. **Explanation:** In cleft lip surgery (Cheiloplasty), the primary goal is to achieve an aesthetic result with minimal scarring. The timing of suture removal is critical to balance wound strength against the risk of permanent "track marks" or "railroad scarring." **Why 4th day is correct:** The facial skin has an excellent blood supply, which promotes rapid healing. Sutures in the facial region are typically removed early—usually between the **3rd and 5th postoperative days**. Removing them on the **4th day** provides sufficient time for the wound edges to adhere while preventing the epithelialization of the suture tracks, which causes permanent scarring. **Analysis of Incorrect Options:** * **2nd day:** This is too early. The tensile strength of the wound is insufficient at 48 hours, and there is a high risk of wound dehiscence (opening). * **7th day:** While common for abdominal or limb surgeries, 7 days is too long for the face. Leaving non-absorbable sutures for a week leads to prominent stitch marks and increased tissue reaction. * **10th day:** This is reserved for areas under high tension or with poor blood supply (e.g., over joints or the back). On the lip, this would result in significant cosmetic deformity. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of 10s (Millard’s Criteria):** Ideal time for cleft lip repair is when the infant is **10 weeks** old, weighs **10 pounds**, and has a hemoglobin of **10 g/dL**. * **Suture Material:** Usually 5-0 or 6-0 Monofilament (e.g., Nylon/Ethilon) or fast-absorbing gut. * **Cleft Palate Repair:** Typically performed between **6–12 months** of age (before the child develops significant speech patterns). * **Logan’s Bow:** A metal bow often taped to the cheeks after surgery to reduce tension on the suture line.

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.

Question 1

Which of the following orthognathic surgeries involves a horizontal cut in the ramus?

Accepted Answer

Sagittal Split Ramus Osteotomy (SSRO)

Answer

Vertical Ramus Osteotomy (VRO)

Answer

Inverted L Osteotomy

Answer

Subapical Osteotomy

Question 2

Which carcinoma has the best prognosis?

Accepted Answer

Carcinoma of the Lip

Answer

Carcinoma of the Cheek

Answer

Carcinoma of the Tongue

Answer

Carcinoma of the Palate

Question 3

In cleft lip operation, on which day are all the stitches typically removed?

Accepted Answer

4th day

Answer

2nd day

Answer

7th day

Answer

10th day

Question 4

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 5

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 6

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 7

What is the most common lesion of the mandible?

Accepted Answer

Ameloblastoma

Answer

Squamous cell carcinoma

Answer

Osteosarcoma

Answer

Osteoclastoma

Question 8

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 9

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 10

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

Head and Neck Surgery — MCQs

Head and Neck Surgery — MCQs

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