Head and Neck Surgery Practice Questions

Q: What is the most common tumor that metastasizes to the brain?

Lung. **Explanation:** Brain metastases are the most common intracranial tumors in adults, occurring much more frequently than primary brain malignancies. **Correct Answer: C. Lung** Lung cancer is the most common primary source of brain metastases, accounting for approximately **40–50%** of all cases. This is due to the high incidence of lung cancer and the ability of tumor cells to enter the systemic circulation directly via the pulmonary veins, bypassing the initial filtration of the lungs and traveling straight to the cerebral vasculature. Both Small Cell Lung Cancer (SCLC) and Non-Small Cell Lung Cancer (NSCLC), particularly adenocarcinoma, have a high predilection for the brain. **Incorrect Options:** * **A. Breast:** This is the **second most common** source (approx. 15–25%). It is a frequent cause in females, but globally, lung cancer remains more common across both genders. * **B. Melanoma:** While melanoma has the **highest propensity** (highest percentage of patients with the disease developing brain spread), it is less common overall than lung cancer due to its lower general incidence. * **D. Prostate:** Prostate cancer rarely metastasizes to the brain parenchyma; it more commonly spreads to the bony calvarium or spinal column. **High-Yield Clinical Pearls for NEET-PG:** * **Most common source overall:** Lung > Breast > Melanoma > Renal Cell Carcinoma > GI tract. * **Highest propensity to bleed:** Melanoma, Choriocarcinoma, RCC, and Thyroid cancer (Mnemonic: **MCRT**). * **Location:** Most metastases occur at the **gray-white matter junction** due to the narrowing of blood vessels (vessel caliber change) trapping tumor emboli. * **Distribution:** 80% occur in the cerebral hemispheres, following the distribution of blood flow (Middle Cerebral Artery territory is most common).

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: What is the treatment of choice for cystic hygroma?

Surgical excision. **Explanation:** **Cystic Hygroma** (Cystic Lymphangioma) is a congenital malformation of the lymphatic system, most commonly occurring in the posterior triangle of the neck. **Why Surgical Excision is the Correct Answer:** The treatment of choice is **complete surgical excision**. The primary goal is to remove the entire cyst wall while preserving vital neurovascular structures (such as the facial nerve or carotid sheath). Because these lesions are benign but infiltrative, "en bloc" resection is often impossible without damaging critical structures; therefore, meticulous dissection and excision are preferred. **Analysis of Incorrect Options:** * **A. Percutaneous aspiration:** This is only a temporary measure. The cyst invariably refills with lymph, and there is a high risk of introducing infection (which makes subsequent surgery much harder). * **B. Intralesional sclerosant injection:** Agents like OK-432 (Picibanil) or Bleomycin are used primarily for **macrocystic** lesions or in cases where surgery is contraindicated (e.g., high surgical risk or extensive infiltration). However, surgery remains the gold standard. * **C. En bloc resection:** While total removal is ideal, "en bloc" implies removing the lesion along with a margin of normal tissue. In the neck, this is avoided to prevent sacrificing essential nerves and vessels. **High-Yield Clinical Pearls for NEET-PG:** * **Transillumination:** Cystic hygromas are characteristically **brilliantly transilluminant** (unlike hemangiomas). * **Association:** Often associated with chromosomal abnormalities like **Turner syndrome** and Down syndrome. * **Complications:** Sudden increase in size usually indicates **intracystic hemorrhage** or infection. * **Timing of Surgery:** Usually performed around 2 years of age unless there is respiratory distress due to compression.

Q: In post-radical neck dissection shoulder syndrome, all are seen except?

Abnormal electromyographic findings. **Explanation:** **Shoulder Syndrome** is a common complication following Radical Neck Dissection (RND), primarily caused by the sacrifice or inadvertent injury of the **Spinal Accessory Nerve (CN XI)**. This nerve provides motor innervation to the Trapezius muscle, which is essential for stabilizing the scapula and facilitating shoulder abduction. **Why "Abnormal electromyographic findings" is the correct (except) answer:** While EMG findings *can* be abnormal in cases of nerve injury, they are **not a clinical feature** of the syndrome itself. Shoulder syndrome is defined by its clinical presentation. Furthermore, in many modern modified neck dissections, the nerve is anatomically preserved but suffers from traction or devascularization (neuropraxia). In such cases, EMG may not show definitive denervation potentials early on, making it an unreliable diagnostic criterion compared to the classic clinical triad. **Analysis of Incorrect Options:** * **Shoulder Drooping:** Loss of trapezius tone leads to the downward and outward rotation of the scapula (scapular flaring), causing the shoulder to sag. * **Pain:** This is often the most distressing symptom, resulting from the strain on the rhomboids and levator scapulae muscles as they attempt to compensate for the paralyzed trapezius. * **Restricted Range of Movement:** Patients specifically lose the ability to abduct the arm beyond 90 degrees, as the scapula cannot be stabilized against the chest wall. **Clinical Pearls for NEET-PG:** * **Nerve Involved:** Spinal Accessory Nerve (CN XI). * **Muscle Affected:** Trapezius (the Sternocleidomastoid is also supplied but its loss doesn't contribute to Shoulder Syndrome). * **Prevention:** Modified Radical Neck Dissection (MRND) Type I or II, where the nerve is preserved. * **Rehabilitation:** Early physical therapy focusing on strengthening the levator scapulae and rhomboids is the mainstay of management.

Q: What is the most common lymph node group involved in tuberculous lymphadenitis?

Posterior cervical. **Explanation:** Tuberculous lymphadenitis (Scrofula) is the most common form of extrapulmonary tuberculosis. In the head and neck region, the **Posterior Cervical** lymph nodes (Level V) are the most frequently involved group. This is a high-yield fact for NEET-PG, as it differs from pyogenic infections which typically involve the anterior chain. * **Why Posterior Cervical is correct:** Unlike pyogenic lymphadenitis which usually spreads from the tonsils or pharynx to the jugulodigastric nodes, TB bacilli often reach the cervical nodes via the lymphatic drainage from the adenoids or through hematogenous spread. Statistically, the posterior triangle nodes are the primary site of involvement in over 50% of cases. * **Why other options are incorrect:** * **Axillary:** While TB can involve axillary nodes, it is far less common than cervical involvement (which accounts for ~70-80% of all peripheral TB lymphadenopathy). * **Intraabdominal:** These nodes (mesenteric) are involved in intestinal TB, but peripheral lymphadenopathy is more common overall. * **Jugulodigastric:** This is the most common node involved in **acute pyogenic tonsillitis** and oral infections, not typically the primary site for TB. **Clinical Pearls for NEET-PG:** * **Presentation:** Characteristically presents as "cold abscesses" (lack of inflammation/heat) and may lead to a **"Collar-stud abscess"** when the infection breaches the deep fascia. * **Diagnosis:** Fine Needle Aspiration Cytology (FNAC) is the initial investigation of choice, showing caseating granulomas. * **Treatment:** Standard Antitubercular Therapy (ATT) for 6 months. Surgery is rarely indicated except for biopsy or drainage of large abscesses.

Q: What is the long-term effect of craniospinal irradiation for medulloblastoma?

Neurocognitive effects. **Explanation:** Craniospinal irradiation (CSI) is a standard treatment for medulloblastoma, but the developing brain is highly sensitive to radiation. **Neurocognitive decline** is the most significant and pervasive long-term complication, particularly in younger children. The underlying mechanism involves radiation-induced damage to the white matter, hippocampal progenitor cells, and microvasculature, leading to deficits in processing speed, executive function, and IQ over time. **Analysis of Options:** * **C. Neurocognitive effects (Correct):** This is the most common and debilitating long-term sequela. The decline is progressive and inversely proportional to the age at the time of treatment (younger children suffer more severe deficits). * **A. Secondary malignancy:** While CSI increases the risk of secondary tumors (like meningiomas or sarcomas) later in life, the incidence is lower compared to the near-universal occurrence of some degree of cognitive impairment. * **B. Neuroendocrine abnormalities:** Growth hormone deficiency and hypothyroidism are common due to hypothalamic-pituitary axis irradiation; however, these are often manageable with replacement therapy, whereas neurocognitive damage is largely irreversible. * **D. Hearing loss:** This is primarily a side effect of **Cisplatin** chemotherapy (ototoxicity) rather than the radiation itself, although radiation can exacerbate it. **High-Yield Clinical Pearls for NEET-PG:** * **Age Factor:** To minimize neurocognitive damage, radiation is generally avoided or delayed in children under **3 years** of age. * **Proton Beam Therapy:** This is increasingly preferred over conventional photon radiation for CSI because it reduces the "exit dose," sparing the heart, lungs, and bowel from unnecessary radiation. * **Medulloblastoma Origin:** It arises from the **vermis** in children (midline) and the **cerebellar hemispheres** in adults.

Q: An edentulous 72-year-old man with a 50-year history of cigarette smoking presents with a nontender, hard mass in the lateral neck. What is the simplest way to establish an accurate histological diagnosis of a neck mass suspected to be cancerous?

Fine needle aspiration cytology. ### Explanation **1. Why Fine Needle Aspiration Cytology (FNAC) is Correct:** In an elderly patient with a history of smoking, a hard, nontender lateral neck mass is considered a **metastatic lymph node from an upper aerodigestive tract squamous cell carcinoma (SCC)** until proven otherwise. FNAC is the **gold standard initial investigation** for any neck mass. It is simple, minimally invasive, cost-effective, and has high sensitivity and specificity (often >90%) for diagnosing malignancy. Crucially, it provides a tissue-based diagnosis without the risks of an open biopsy (such as tumor seeding or compromising future neck dissection planes). **2. Why the Other Options are Incorrect:** * **Bone marrow biopsy:** This is used for hematological malignancies (like leukemia or certain stages of lymphoma). While lymphoma can cause neck masses, it is not the primary suspicion in a heavy smoker with a hard, fixed mass. * **Nasopharyngoscopy:** While this is a vital part of the "work-up" to find the **primary tumor** (especially in the occult primary setting), it does not provide a histological diagnosis of the *neck mass* itself. * **CT scan of the head and neck:** This is an imaging modality used for staging and assessing the extent of the disease (involvement of vessels/bones). It provides anatomical detail but cannot provide a histological/cytological diagnosis. **3. Clinical Pearls for NEET-PG:** * **Rule of 80:** In non-thyroid neck masses in adults, 80% are neoplastic; of those, 80% are malignant; of those, 80% are metastatic SCC. * **Avoid Incisional Biopsy:** Never perform an incisional or excisional biopsy of a suspected metastatic neck node before a thorough search for the primary and an FNAC. * **Triple Endoscopy (Panendoscopy):** If FNAC confirms SCC but no primary is seen on physical exam, the next step is panendoscopy (laryngoscopy, esophagoscopy, and bronchoscopy) with directed biopsies.

Q: Radical neck dissection involves the removal of which of the following structures?

Spinal accessory nerve. **Explanation:** The **Radical Neck Dissection (RND)**, originally described by Crile, is the gold standard against which all other neck dissections are compared. It involves the removal of lymph node levels I through V along with three specific non-lymphatic structures. **1. Why Option A is correct:** In a classic Radical Neck Dissection, the **Spinal Accessory Nerve (CN XI)** is routinely sacrificed along with the **Internal Jugular Vein (IJV)** and the **Sternocleidomastoid (SCM) muscle**. The removal of CN XI leads to "Shoulder Syndrome," characterized by shoulder pain and limited abduction due to trapezius muscle atrophy. **2. Analysis of Incorrect Options:** * **Option B (External Jugular Vein):** While the EJV is typically removed during the procedure, it is not one of the "three hallmark structures" (SCM, IJV, CN XI) that define the transition from a Radical to a Modified Radical Neck Dissection (MRND). * **Option C (Tail of the parotid gland):** The tail of the parotid is often included in Level II clearance to ensure adequate lymphadenectomy, but it is considered an incidental removal rather than a defining component of the RND. * **Option D (All of the above):** This is incorrect because the question tests the specific anatomical landmarks that define the radicality of the procedure. **High-Yield Clinical Pearls for NEET-PG:** * **Modified Radical Neck Dissection (MRND):** Removal of lymph nodes (I-V) with preservation of one or more non-lymphatic structures. * **Type I:** CN XI preserved. * **Type II:** CN XI and IJV preserved. * **Type III (Functional Neck Dissection):** CN XI, IJV, and SCM all preserved. * **Selective Neck Dissection:** Only specific lymph node levels are removed (e.g., Supraomohyoid dissection for oral cavity cancers). * **Boundary:** The posterior limit of a radical neck dissection is the anterior border of the **trapezius muscle**.

Question 1

What is the most common tumor that metastasizes to the brain?

Accepted Answer

Lung

Answer

Breast

Answer

Melanoma

Answer

Prostate

Question 2

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 3

What is the treatment of choice for cystic hygroma?

Accepted Answer

Surgical excision

Answer

Percutaneous aspiration

Answer

Intralesional sclerosant injection

Answer

En bloc resection

Question 4

In post-radical neck dissection shoulder syndrome, all are seen except?

Accepted Answer

Abnormal electromyographic findings

Answer

Restricted range of movement

Answer

Pain

Answer

Shoulder drooping

Question 5

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

Question 6

What is the most common lymph node group involved in tuberculous lymphadenitis?

Accepted Answer

Posterior cervical

Answer

Axillary

Answer

Intraabdominal

Answer

Jugulodigastric

Question 7

What is the long-term effect of craniospinal irradiation for medulloblastoma?

Accepted Answer

Neurocognitive effects

Answer

Secondary malignancy

Answer

Neuroendocrine abnormalities

Answer

Hearing loss

Question 8

An edentulous 72-year-old man with a 50-year history of cigarette smoking presents with a nontender, hard mass in the lateral neck. What is the simplest way to establish an accurate histological diagnosis of a neck mass suspected to be cancerous?

Accepted Answer

Fine needle aspiration cytology

Answer

Bone marrow biopsy

Answer

Nasopharyngoscopy

Answer

CT scan of the head and neck

Question 9

In patients with facial disproportion producing malocclusion, which of the following statements is true?

Accepted Answer

A sagittal split osteotomy commonly produces inferior dental nerve paraesthesia.

Answer

An osteotomy alone in the mandibular ramus can be used to close an anterior open bite.

Answer

An intraoral vertical subsigmoid osteotomy is appropriate for treating mandibular retrognathia.

Answer

Following a downfracture of the maxilla at Le Fort I level, the blood supply to the alveolus relies only on the integrity of the greater palatine artery.

Question 10

Radical neck dissection involves the removal of which of the following structures?

Accepted Answer

Spinal accessory nerve

Answer

External jugular vein

Answer

Tail of the parotid gland

Answer

All of the above

Head and Neck Surgery — MCQs

Head and Neck Surgery — MCQs

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