Head and Neck Surgery Practice Questions

Q: What is the most common anatomical location of a thyroglossal cyst?

Infra-hyoid. **Explanation:** The **thyroglossal cyst** is the most common congenital neck swelling. It develops from a persistent segment of the thyroglossal duct, which marks the descent of the thyroid gland from the foramen caecum at the base of the tongue to its final pre-tracheal position. **Why Infra-hyoid is correct:** While a thyroglossal cyst can occur anywhere along the migratory path of the duct, the **infra-hyoid** position (specifically just below the hyoid bone) is the most frequent site, accounting for approximately **65% of cases**. The cyst is typically midline and moves upward on protrusion of the tongue due to its attachment to the hyoid bone via the tract. **Analysis of Incorrect Options:** * **A. Lingual:** This is the highest possible location (within the tongue). It is rare, occurring in less than 2% of cases. * **B. Infra-lingual (Sublingual):** Located between the tongue and the hyoid bone. While more common than lingual, it is less frequent than the infra-hyoid variety. * **C. Supra-hyoid:** Located just above the hyoid bone. This accounts for about 20-25% of cases, making it the second most common site, but still less frequent than infra-hyoid. **High-Yield Clinical Pearls for NEET-PG:** * **Sistrunk Operation:** The definitive surgical treatment. It involves excision of the cyst, the entire tract, and the **central body of the hyoid bone** to minimize recurrence. * **Movement:** It moves upward on **deglutition** (swallowing) AND **protrusion of the tongue**. * **Carcinoma:** If a malignancy develops within a thyroglossal cyst (rare, <1%), the most common histological type is **Papillary Carcinoma of the Thyroid**. * **Differential Diagnosis:** Always perform an ultrasound to ensure a normal thyroid gland is present in the neck before excision, as the cyst may contain the patient's only functioning thyroid tissue (Ectopic Thyroid).

Q: What is true about tumors of the salivary glands?

The most common site is the parotid gland.. ### Explanation **1. Why Option A is Correct:** The parotid gland is the most common site for salivary gland tumors, accounting for approximately **80%** of all cases. A useful rule of thumb in salivary gland pathology is the "Rule of 80s": 80% of tumors occur in the parotid, and 80% of parotid tumors are benign (most commonly Pleomorphic Adenoma). **2. Why the Other Options are Incorrect:** * **Option B:** Enucleation (simple shelling out of the tumor) is contraindicated because pleomorphic adenomas often have pseudopods (microscopic extensions) through the capsule. Enucleation leads to high recurrence rates. The standard treatment for a parotid tumor is **Superficial Parotidectomy** (if in the superficial lobe) with preservation of the facial nerve. * **Option C:** While FNAC is a highly useful diagnostic tool with high sensitivity and specificity, it is **not mandatory** if the clinical diagnosis is clear and surgery is already indicated. Imaging (MRI/CT) is often prioritized to assess the extent of the tumor. * **Option D:** Approximately **80-90%** of parotid tumors originate in the **superficial lobe** (lateral to the facial nerve). Deep lobe involvement is much less common and may present as a parapharyngeal mass (dumbbell-shaped tumor). **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common benign tumor:** Pleomorphic Adenoma (all glands). * **Most common malignant tumor:** Mucoepidermoid Carcinoma (all glands). * **Warthin’s Tumor (Adenolymphoma):** Second most common benign parotid tumor; associated with smoking, often bilateral, and shows "hot spots" on Technetium-99m pertechnetate scan. * **Adenoid Cystic Carcinoma:** Known for **perineural invasion**, causing early pain and nerve palsies; has a "Swiss cheese" appearance on histology. * **Malignancy Rule:** The smaller the gland, the higher the chance of malignancy (Parotid ~20%, Submandibular ~40-50%, Sublingual/Minor ~80%).

Q: What is the treatment for a recurrent ranula?

Excision with adjacent glands. **Explanation:** A **ranula** is a mucus extravasation cyst occurring in the floor of the mouth, typically arising from the **sublingual salivary gland**. Understanding the pathophysiology is key: the cyst is not a true cyst (it lacks an epithelial lining) but a collection of saliva leaked from a ruptured duct. **Why Option C is Correct:** The definitive treatment for a recurrent ranula is the **excision of the cyst along with the offending sublingual salivary gland**. Since the gland is the source of the leaked mucus, leaving it in situ leads to a high risk of recurrence. Removing the "adjacent glands" (specifically the sublingual gland) addresses the root cause and prevents further extravasation. **Why Other Options are Incorrect:** * **Incision (A):** Simply cutting the cyst provides only temporary drainage; the fluid will re-accumulate almost immediately once the incision heals. * **Excision (B):** Removing only the pseudocyst wall without removing the sublingual gland results in a high recurrence rate (approx. 25% or more), as the secretory source remains. * **Marsupialization (D):** This involves opening the cyst and suturing the edges to the oral mucosa. While it is a common primary treatment for simple ranulas, it has a high failure rate for recurrent or plunging ranulas. **NEET-PG High-Yield Pearls:** * **Plunging Ranula:** A clinical variant that herniates through the **mylohyoid muscle** into the submandibular space, presenting as a neck swelling. * **Treatment of Plunging Ranula:** Requires excision of the sublingual gland via an intraoral approach, often combined with drainage of the cervical collection. * **Differential Diagnosis:** Always differentiate from a dermoid cyst (which is midline and has a "doughy" consistency). * **Nerve at Risk:** During excision, the **lingual nerve** (which loops under the submandibular duct) is the structure most at risk of injury.

Q: Thyroglossal fistula develops due to what?

Incomplete removal of thyroglossal cyst. **Explanation:** A **thyroglossal fistula** is almost never a congenital (developmental) condition. Instead, it is an **acquired** condition that typically follows the rupture or surgical interference of a thyroglossal cyst. **Why Option C is correct:** The most common cause of a thyroglossal fistula is the **incomplete removal** of a thyroglossal cyst or its tract. If a surgeon fails to remove the entire tract (including the mid-portion of the hyoid bone), the remaining epithelial lining continues to secrete fluid, which eventually tracks to the skin surface, forming a fistula. It can also occur if a thyroglossal cyst becomes infected, forms an abscess, and bursts spontaneously or is simply incised and drained (I&D). **Why other options are incorrect:** * **A. Developmental anomaly:** While the *cyst* is developmental (due to persistent thyroglossal duct), the *fistula* is not present at birth. It is a secondary complication. * **B. Injury:** While trauma can occur, it is not the standard clinical etiology for these fistulae. * **D. Inflammatory disorder:** While infection (inflammation) often precedes the formation of a fistula, the underlying cause is the presence of the cyst/duct itself, not a primary inflammatory disease. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** The fistula is usually located in the midline of the neck, below the hyoid bone. * **Clinical Sign:** The fistula/cyst moves upward on **protrusion of the tongue** (due to its attachment to the hyoid bone and foramen caecum). * **Surgical Management:** The definitive treatment is the **Sistrunk Operation**. This involves excision of the cyst, the entire tract, and the **central part of the hyoid bone** to prevent recurrence. * **Lining:** It is lined by pseudostratified ciliated columnar epithelium.

Q: Radical dissection of the neck includes all of the following except:

Phrenic nerves. The **Radical Neck Dissection (RND)**, originally described by Crile in 1906, is the gold standard surgical procedure for managing cervical lymph node metastasis. It involves the systematic removal of all lymph node groups from Level I to Level V on one side of the neck, along with three specific non-lymphatic structures. ### Why Phrenic Nerve is the Correct Answer: The **phrenic nerve** (C3-C5) lies deep to the prevertebral fascia on the anterior scalene muscle. In a standard RND, the surgical plane is superficial to the prevertebral fascia. Preserving the phrenic nerve is critical to maintain diaphragmatic function; its accidental resection leads to hemi-diaphragmatic paralysis. Therefore, it is **not** part of the radical dissection. ### Analysis of Incorrect Options: A Radical Neck Dissection specifically includes the removal of: * **Cervical Lymph Nodes (Option A):** All nodes in Levels I through V are removed. * **Sternocleidomastoid Muscle (Option B):** Removed to provide access to the deep cervical nodes and ensure oncological clearance. * **Internal Jugular Vein (Option D):** Removed as it is closely associated with the deep cervical chain (Level II, III, IV). * **Spinal Accessory Nerve (CN XI):** (Not listed in options but also removed in a classic RND). ### High-Yield Clinical Pearls for NEET-PG: * **Modified Radical Neck Dissection (MRND):** Removal of Level I-V nodes but **preservation** of one or more non-lymphatic structures (Type I: Preserves CN XI; Type II: Preserves CN XI + IJV; Type III: Preserves CN XI + IJV + SCM). * **Selective Neck Dissection (SND):** Preservation of one or more lymph node groups (e.g., Supraomohyoid dissection). * **Structures always preserved in RND:** Vagus nerve, Phrenic nerve, Brachial plexus, and Carotid artery.

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.

Question 1

A 80-year-old edentulous male patient presents with a midline tumor of the lower jaw, involving the alveolar margin. What is the treatment of choice?

Accepted Answer

Segmental mandibulectomy

Answer

Hemi-mandibulectomy

Answer

Commando operation

Answer

Marginal mandibulectomy

Question 2

What is the most common anatomical location of a thyroglossal cyst?

Accepted Answer

Infra-hyoid

Answer

Lingual

Answer

Infra-lingual (caecum)

Answer

Supra-hyoid

Question 3

What is true about tumors of the salivary glands?

Accepted Answer

The most common site is the parotid gland.

Answer

Enucleation is the treatment of choice.

Answer

Fine Needle Aspiration Cytology (FNAC) is mandatory.

Answer

The most common site of origin is the deep lobe.

Question 4

What is true of a carotid body tumor?

Accepted Answer

Similar to mixed parotid tumor

Answer

Non-chromaffin paraganglioma

Answer

Good prognosis

Answer

Rarely metastasizes

Question 5

What is the treatment for a recurrent ranula?

Accepted Answer

Excision with adjacent glands

Answer

Incision

Answer

Excision

Answer

Marsupialization

Question 6

Thyroglossal fistula develops due to what?

Accepted Answer

Incomplete removal of thyroglossal cyst

Answer

Developmental anomaly

Answer

Injury

Answer

Inflammatory disorder

Question 7

Radical dissection of the neck includes all of the following except:

Accepted Answer

Phrenic nerves

Answer

Cervical lymph nodes

Answer

Sternocleidomastoid muscle

Answer

Internal jugular vein

Question 8

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 9

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 10

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

Head and Neck Surgery — MCQs

Head and Neck Surgery — MCQs

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