Head and Neck Surgery Practice Questions

Q: Which of the following is NOT typically included in a Commando operation?

Modified radical neck dissection. The **Commando Operation** (COmbined MAndibulectomy and Neck Dissection Operation) is a classic surgical procedure for advanced oral cavity cancers, particularly those involving the tongue or floor of the mouth with mandibular invasion. ### **Explanation of the Correct Answer** The "Neck Dissection" component of a traditional Commando operation historically refers to a **Radical Neck Dissection (RND)**, not a Modified Radical Neck Dissection (MRND). In a classic RND, the Sternocleidomastoid muscle, Internal Jugular Vein, and Spinal Accessory Nerve are sacrificed along with the lymph nodes. While modern surgeons often perform MRND to reduce morbidity, the classic definition of the procedure—and the one tested in competitive exams—includes a **Radical Neck Dissection**. ### **Analysis of Incorrect Options** * **Hemimandibulectomy (B):** This is the hallmark of the procedure. The "Mando" in Commando refers to the resection of a portion of the mandible to ensure clear margins when the tumor is fixed to the bone. * **Total Glossectomy (A) & Removal of Floor of Mouth (C):** These represent the "Combined" resection of the primary tumor. Depending on the tumor's extent, the procedure involves removing the primary lesion (tongue/floor of mouth) in continuity with the jaw and lymph nodes (en-bloc resection). ### **High-Yield Clinical Pearls for NEET-PG** * **Eponym:** Also known as the **Ward’s Operation**. * **Indication:** Primarily for Stage III and IV squamous cell carcinoma of the oral cavity where the tumor involves the mandible. * **Key Principle:** It is an **en-bloc resection**, meaning the primary tumor and the regional lymph nodes are removed as a single continuous specimen to prevent "seeding" of cancer cells. * **Composite Resection:** This is a broader term often used interchangeably with Commando, referring to the removal of bone, soft tissue, and lymph nodes.

Q: What is the most common subependymal location for a subependymal giant cell astrocytoma?

Foramen of Monro. **Explanation:** **Subependymal Giant Cell Astrocytoma (SEGA)** is a benign (WHO Grade 1), slow-growing tumor characteristically associated with **Tuberous Sclerosis Complex (TSC)**. **Why Foramen of Monro is correct:** SEGAs almost exclusively arise from the wall of the lateral ventricles, specifically near the **Foramen of Monro**. They typically originate from the transformation of subependymal nodules (hamartomas) located in this region. Due to this strategic location, the most common clinical presentation is obstructive hydrocephalus caused by the blockage of cerebrospinal fluid (CSF) flow from the lateral ventricles to the third ventricle. **Analysis of Incorrect Options:** * **A & C (Trigone and Temporal horn):** While these are parts of the lateral ventricle where other tumors (like intraventricular meningiomas or choroid plexus papillomas) may occur, SEGAs have a predilection for the perimonroal region rather than the posterior or inferior horns. * **D (Fourth ventricle):** This is a common site for ependymomas and medulloblastomas in children, but it is an extremely rare and atypical location for a SEGA. **High-Yield Clinical Pearls for NEET-PG:** * **Association:** If you see "SEGA" in a question, look for features of Tuberous Sclerosis (Ash-leaf spots, Shagreen patches, facial angiofibromas, and renal angiomyolipomas). * **Imaging:** On MRI, they appear as well-circumscribed masses near the Foramen of Monro that show **marked enhancement** with gadolinium. * **Management:** Surgical resection is the traditional treatment; however, **mTOR inhibitors (e.g., Everolimus)** are now a first-line medical therapy to reduce tumor volume in TSC patients.

Q: Which of the following nerves is damaged in Frey's syndrome?

Auriculotemporal nerve. **Explanation:** **Frey’s Syndrome** (Gustatory Sweating) is a common complication following parotidectomy or trauma to the parotid gland. **Why the Auriculotemporal nerve is correct:** The auriculotemporal nerve (a branch of the mandibular division of the Trigeminal nerve) carries two types of fibers: **parasympathetic** (secretomotor to the parotid gland) and **sympathetic** (sudomotor to the overlying sweat glands). During parotid surgery, these fibers are severed. During regeneration, the parasympathetic fibers misdirect and grow into the distal sympathetic sheaths of the sweat glands. Consequently, a stimulus intended for salivation (seeing or smelling food) results in localized sweating and flushing over the pre-auricular skin. **Why the other options are incorrect:** * **Facial nerve (CN VII):** While it passes through the parotid gland and is at risk of injury during surgery (leading to facial palsy), it does not mediate the gustatory sweating reflex. * **Mandibular nerve (V3):** The auriculotemporal nerve is a *branch* of V3. In NEET-PG, always choose the most specific anatomical structure provided. * **Trigeminal nerve (CN V):** This is the parent nerve. While technically involved, it is too broad an answer compared to the specific branch responsible for the syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Confirmed by the **Minor’s Starch-Iodine Test** (affected area turns blue-black upon sweating). * **Prevention:** Interposition of barriers like the **Acellular Dermal Matrix** or **SMAS flap** during surgery. * **Treatment:** Topical anticholinergics or **Botulinum toxin (Botox) injections** (most effective). * **Path of Parasympathetic fibers:** Inferior salivatory nucleus → Glossopharyngeal nerve → Tympanic plexus → Lesser petrosal nerve → Otic ganglion → Auriculotemporal nerve.

Q: Which of the following is true about a ranula?

It can resolve spontaneously.. ### Explanation A **ranula** is a clinical term for a pseudocyst that occurs in the floor of the mouth, typically caused by mucus extravasation from the **sublingual gland**. **1. Why the correct answer is right:** * **Option D:** Ranulas are dynamic lesions. Small, superficial ranulas can rupture spontaneously due to trauma or pressure, leading to the release of mucus and temporary resolution. However, they often recur if the underlying salivary leak is not addressed. **2. Why the incorrect options are wrong:** * **Option A:** A ranula is technically a **pseudocyst** (mucus extravasation cyst), not a true retention cyst. It lacks an epithelial lining; instead, it is surrounded by granulation tissue or condensed connective tissue. * **Option B:** It most commonly arises from the **sublingual gland** (specifically the ducts of Rivinus), not the submandibular gland. * **Option C:** Incision and drainage (I&D) is **not** the treatment of choice because it is associated with a near 100% recurrence rate. The gold standard treatment is **surgical excision of the ranula along with the sublingual gland** or marsupialization (for smaller lesions). **3. High-Yield Clinical Pearls for NEET-PG:** * **Plunging Ranula:** This occurs when the mucus extravasates through or around the **mylohyoid muscle**, presenting as a painless, soft swelling in the submandibular region (neck). * **Appearance:** Classically described as a "blue, translucent, frog-belly-like" swelling in the floor of the mouth. * **Differential Diagnosis:** Dermoid cyst (which is midline and has a "doughy" consistency). * **Imaging:** MRI is the investigation of choice to visualize the "tail sign" in plunging ranulas.

Q: Which is the ideal position for nasogastric tube insertion?

Sitting with neck flexed. **Explanation:** The ideal position for nasogastric (NG) tube insertion is **Sitting with the neck flexed** (often referred to as the "High Fowler’s position with a chin-tuck maneuver"). **Why it is correct:** The primary goal during NG tube insertion is to ensure the tube enters the esophagus rather than the trachea. Flexing the neck (chin-to-chest) performs two critical anatomical functions: 1. It physically narrows the airway opening by bringing the larynx forward. 2. It opens the posterior oropharyngeal path toward the esophagus. When the patient is sitting upright, gravity assists the passage of the tube, and the flexion maneuver makes the esophagus the path of least resistance. **Why the other options are incorrect:** * **Neck Extended (Options A & C):** Extending the neck straightens the air passage toward the trachea. This significantly increases the risk of accidental tracheal intubation and aspiration. * **Supine Position (Options B & C):** While NG tubes can be inserted in supine patients (e.g., in the ICU), it is not "ideal." The supine position increases the risk of gagging and pulmonary aspiration of gastric contents compared to the sitting position. **Clinical Pearls for NEET-PG:** * **Measurement:** The length of the tube to be inserted is determined by the distance from the **Nose to the Earlobe to the Xiphoid process (NEX measurement)**. * **Gold Standard for Confirmation:** While auscultation of an air bolus ("whoosh test") is common, the **Chest X-ray** is the most reliable method to confirm correct placement before starting feeds. * **pH Testing:** A gastric aspirate with a **pH < 5.5** is a reliable bedside indicator of gastric placement. * **Coiling:** If the patient starts coughing or gasping, the tube is likely in the larynx; withdraw immediately.

Q: In which one of the following, perineural invasion in head and neck cancer is most commonly seen?

Adenoid cystic carcinoma. **Explanation:** **Adenoid cystic carcinoma (ACC)** is the correct answer because it is classically characterized by its high propensity for **perineural invasion (PNI)**. This tumor typically arises in the minor salivary glands (most commonly the palate) and the submandibular gland. The tumor cells have a unique affinity for nerve sheaths, often spreading far beyond the visible tumor margins via cranial nerves (e.g., the facial nerve or trigeminal nerve). This characteristic explains the high rates of local recurrence and the frequent clinical presentation of pain or nerve palsies. **Analysis of Incorrect Options:** * **Adenocarcinoma:** While it can show PNI, it is not its defining or most common feature compared to ACC. * **Basal cell adenoma:** This is a **benign** salivary gland tumor. Perineural invasion is a hallmark of malignancy; therefore, it is not seen in benign lesions. * **Squamous cell carcinoma (SCC):** SCC is the most common head and neck cancer overall and *can* exhibit PNI (especially in high-grade cases), but it is not as pathognomonic or frequent as it is in Adenoid Cystic Carcinoma. **High-Yield Clinical Pearls for NEET-PG:** * **Histology of ACC:** Look for the characteristic **"Swiss cheese" appearance** (Cribriform pattern). * **Spread:** ACC is known for "skip lesions" along nerves and has a high rate of **distant metastasis** (most commonly to the **lungs**) via the bloodstream, even when local lymph nodes are negative. * **Prognosis:** It is a slow-growing but relentless "indolent" tumor with a poor long-term prognosis. * **Treatment:** Radical surgical excision with wide margins followed by adjuvant radiotherapy is the standard of care due to the risk of microscopic perineural spread.

Q: What is the treatment for lower lip carcinoma less than 1 cm?

Surgical excision. **Explanation:** The primary treatment for early-stage (T1) lower lip carcinoma, specifically lesions less than 1 cm, is **surgical excision**. The goal is to achieve a wide local excision with a 5–10 mm clear margin. For lesions of this size, a **V-shaped or wedge resection** is typically performed, allowing for primary closure with excellent functional and cosmetic outcomes. **Why the other options are incorrect:** * **Radiotherapy (A):** While radiotherapy is an alternative for T1-T2 lesions and offers similar control rates, it is generally reserved for patients who are medically unfit for surgery or for larger lesions where surgery would cause significant cosmetic deformity. Surgery is preferred for small lesions because it is quicker, more cost-effective, and avoids long-term radiation side effects (e.g., xerostomia, osteoradionecrosis). * **Chemotherapy (B):** Chemotherapy is not used as a primary or definitive treatment for localized lip cancer. It is typically reserved for palliative care or as part of a concurrent chemoradiation protocol for advanced, inoperable cases. * **Radiotherapy + Chemotherapy (D):** This combination is indicated for advanced (Stage III/IV) disease or high-risk features (positive margins, perineural invasion) but is overtreatment for a <1 cm lesion. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Lower lip (90%) due to chronic sun exposure (UV radiation). * **Histology:** Squamous Cell Carcinoma (SCC) is the most common type. * **Lymphatic spread:** Lower lip cancers primarily drain to **Submental (Level Ia)** and **Submandibular (Level Ib)** nodes. * **Rule of Thirds:** If a defect after excision is 2/3rd, use a **Karapandzic** flap.

Question 1

What is the treatment for bilateral soft tissue undercut?

Accepted Answer

Removal of the tissue on one side only

Answer

Removal of tissue on both sides

Answer

No removal of the tissue is necessary

Answer

Any of the above

Question 2

A deep-seated carcinoma in the neck near the bifurcation of the common carotid artery, with no evidence of primary carcinoma of the mouth, pharynx, or larynx, is most likely what type of tumor?

Accepted Answer

Branchiogenic carcinoma.

Answer

Collar stud abscess.

Answer

Subhyoid bursal cyst.

Answer

Cold abscess.

Question 3

Which of the following is NOT typically included in a Commando operation?

Accepted Answer

Modified radical neck dissection

Answer

Total glossectomy

Answer

Hemimandibulectomy

Answer

Removal of floor of mouth

Question 4

What is the most common subependymal location for a subependymal giant cell astrocytoma?

Accepted Answer

Foramen of Monro

Answer

Trigone of the lateral ventricle

Answer

Temporal horn of the lateral ventricle

Answer

Fourth ventricle

Question 5

Which of the following nerves is damaged in Frey's syndrome?

Accepted Answer

Auriculotemporal nerve

Answer

Facial nerve

Answer

Mandibular nerve

Answer

Trigeminal nerve

Question 6

Which of the following is true about a ranula?

Accepted Answer

It can resolve spontaneously.

Answer

It is a retention cyst.

Answer

It arises from the submandibular gland.

Answer

Incision and drainage is the treatment of choice.

Question 7

What is the best treatment for a large cyst?

Accepted Answer

Marsupialisation followed by Enucleation

Answer

Enucleation

Answer

Marsupialisation

Answer

Enucleation followed by marsupialisation

Question 8

Which is the ideal position for nasogastric tube insertion?

Accepted Answer

Sitting with neck flexed

Answer

Sitting with neck extended

Answer

Supine with neck flexed

Answer

Supine with neck extended

Question 9

In which one of the following, perineural invasion in head and neck cancer is most commonly seen?

Accepted Answer

Adenoid cystic carcinoma

Answer

Adenocarcinoma

Answer

Basal cell adenoma

Answer

Squamous cell carcinoma

Question 10

What is the treatment for lower lip carcinoma less than 1 cm?

Accepted Answer

Surgical excision

Answer

Radiotherapy

Answer

Chemotherapy

Answer

Radiotherapy + Chemotherapy

Head and Neck Surgery — MCQs

Head and Neck Surgery — MCQs

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