Head and Neck Surgery Practice Questions

Q: A 4-year-old girl presenting with a painless, mobile, cystic swelling in the midline of her neck, located just below the hyoid bone, is scheduled for tonsillectomy. The swelling measures 2x1x1 cm. An ultrasound reveals a thick-walled cystic lesion. What is the recommended management?

Surgical removal. **Explanation:** The clinical presentation of a midline, mobile, cystic swelling below the hyoid bone in a child is classic for a **Thyroglossal Duct Cyst (TGDC)**. This is the most common congenital neck swelling, resulting from a persistent tract along the descent of the thyroid gland from the foramen caecum to its final pre-tracheal position. **1. Why Surgical Removal is Correct:** The definitive management for a TGDC is surgical excision, specifically the **Sistrunk Procedure**. This involves removing the cyst, the entire ductal tract, and the **central portion of the hyoid bone** to minimize the high risk of recurrence (which is ~50% if the hyoid is not removed). Surgery is indicated to prevent recurrent infections, abscess formation, and the rare risk of papillary thyroid carcinoma (1%) later in life. **2. Why Other Options are Incorrect:** * **Antibiotics:** These are only indicated if the cyst is acutely infected (thyroglossal abscess). They do not treat the underlying anatomical defect. * **Percutaneous Aspiration:** This is contraindicated as it carries a high risk of infection and recurrence; it is neither diagnostic nor curative. * **Chest X-ray:** This has no role in the diagnosis of a neck cyst. However, an **Ultrasound of the neck** is mandatory to confirm the presence of a normal thyroid gland in its usual position before surgery. **Clinical Pearls for NEET-PG:** * **Pathognomonic Sign:** The swelling moves upward on **protrusion of the tongue** (due to attachment to the hyoid) and on deglutition. * **Most Common Site:** Subhyoid (as seen in this case). * **Sistrunk Procedure:** The "Gold Standard" treatment. * **Ectopic Thyroid:** Always rule out if the TGDC is the patient's only functioning thyroid tissue before excision.

Q: A 40-year-old patient presents with a swelling on the left lateral aspect of the neck. Examination reveals a painless swelling that moves side-to-side but not up-and-down. There is no history of tuberculosis. Laboratory investigations, including thyroid profile and CBC, are normal. Ultrasound shows a highly vascular hypoechoic mass lesion anterior to the sternocleidomastoid muscle. A CT angiogram was subsequently performed. What is the most likely diagnosis?

Carotid body paraganglioma. ### Explanation The clinical presentation and imaging findings are classic for a **Carotid Body Paraganglioma** (also known as a Chemodectoma). **Why the Correct Answer is Right:** * **Clinical Sign:** The hallmark of this tumor is the **Fontaine Sign**—the mass is mobile horizontally (side-to-side) but fixed vertically because it is tethered to the carotid bifurcation. * **Location:** It typically presents at the level of the hyoid bone, anterior to the sternocleidomastoid muscle, within the carotid triangle. * **Imaging:** Ultrasound shows a **highly vascular**, hypoechoic mass. The gold standard for diagnosis is CT or MR Angiography, which reveals the pathognomonic **"Lyre Sign"**—the splaying of the internal and external carotid arteries at the bifurcation. **Why Incorrect Options are Wrong:** * **Fibromatosis colli:** This is a benign proliferation of the sternocleidomastoid muscle seen in **neonates/infants** (congenital muscular torticollis), not in 40-year-olds. * **Tubercular lymph node:** Usually presents with constitutional symptoms (fever, weight loss), may show central necrosis on imaging, and is not typically hypervascular on angiography. * **Soft tissue sarcoma:** While these can be vascular, they do not specifically splay the carotid bifurcation or demonstrate the specific horizontal-only mobility characteristic of carotid body tumors. **NEET-PG High-Yield Pearls:** 1. **Lyre Sign:** Widening of the carotid bifurcation on angiography. 2. **Salt-and-Pepper Appearance:** Seen on T1-weighted MRI (Salt = hemorrhage/slow flow; Pepper = flow voids of high-velocity vessels). 3. **Shamblin Classification:** Used to grade these tumors based on their involvement/encasement of the carotid arteries. 4. **Origin:** Arises from the **neural crest cells** (chemoreceptors) located at the carotid body.

Q: What is the most common site for carcinoma of the tongue?

Lateral margin. **Explanation:** Carcinoma of the tongue is the most common intraoral cancer, predominantly presenting as **Squamous Cell Carcinoma (SCC)**. **1. Why Lateral Margin is Correct:** The **lateral margin** of the anterior two-thirds (oral tongue) is the most common site, accounting for approximately **75% of cases**. This is attributed to the "pooling effect," where carcinogens in saliva (from tobacco and alcohol) gravitate toward the floor of the mouth and the lateral borders. Chronic irritation from sharp, jagged teeth or ill-fitting dentures also frequently affects this area, acting as a co-factor in carcinogenesis. **2. Analysis of Incorrect Options:** * **Tip of the tongue:** This is a rare site for malignancy. While it is highly mobile, it has less prolonged contact with pooled carcinogens compared to the lateral borders. * **Posterior 1/3 (Base of Tongue):** This area is part of the oropharynx. While tumors here are often more aggressive and diagnosed at a later stage due to rich lymphatic drainage, they are less frequent than lateral margin tumors. These are increasingly associated with **HPV-16**. * **Ventral surface:** While the ventral surface and floor of the mouth are high-risk areas, they are statistically less common primary sites than the lateral margins. **3. NEET-PG High-Yield Pearls:** * **Lymphatic Drainage:** The tip drains to submental nodes; the lateral borders drain to submandibular nodes (Level Ib); the posterior 1/3 drains directly to deep cervical nodes (Jugulodigastric). * **Premalignant Lesions:** Erythroplakia has a much higher transformation rate than Leukoplakia. * **Prognosis:** The most important prognostic factor is the **depth of invasion (DOI)** and the presence of **lymph node metastasis**. * **Field Cancerization:** This concept explains why patients with one oral primary are at high risk for synchronous or metachronous tumors.

Q: Fracture of a mandible with an edentulous jaw is best treated with which of the following?

External fixator. **Explanation:** The management of mandibular fractures in an **edentulous jaw** (a jaw without teeth) presents a unique challenge because the standard method of stabilization—**Intermaxillary Fixation (IMF)**—cannot be performed due to the lack of teeth to anchor the wires. **Why External Fixator is Correct:** In an edentulous patient, an **External Fixator** (such as the Morris biphase splint) is the preferred treatment when open reduction is not feasible. It provides rigid stabilization by placing pins into the bone fragments through the skin, bypassing the need for dental anchorage. This allows for fracture healing while maintaining the vertical dimension of the face. **Analysis of Incorrect Options:** * **Interdental wiring (C) and Intermaxillary elastic traction (D):** These techniques require a sufficient number of stable teeth in both the upper and lower jaws to "tie" the mouth shut and align the fracture. In an edentulous patient, there is no substrate for these wires or elastics to grip. * **Minerva plaster (B):** This is a specialized orthopedic cast used for cervical and upper thoracic spine fractures (extending from the head to the hips). It has no role in the stabilization of mandibular fractures. **Clinical Pearls for NEET-PG:** * **Gunning Splints:** If an edentulous patient has existing dentures, they can be modified (Gunning splints) and wired to the jaw (circum-mandibular wiring) to act as a substitute for teeth during fixation. * **Atrophy:** Edentulous mandibles are often severely atrophic (thin). This makes them prone to "non-union" and increases the risk of further fracture during surgical plating. * **Gold Standard:** While external fixators are a classic answer for exams, **Open Reduction and Internal Fixation (ORIF)** with mini-plates is increasingly used in modern practice if the bone quality allows.

Q: Which teeth are removed first?

First. **Explanation:** In the context of dental extractions, particularly when multiple teeth are being removed in a single quadrant, the sequence of extraction is clinically significant to ensure surgical efficiency and patient comfort. **Why "First" is the correct answer:** The correct sequence for multiple extractions follows the rule of **"Posterior to Anterior."** Therefore, the **First Molar** (or the most posterior tooth intended for extraction) is removed first. * **Medical Concept:** Removing the most posterior teeth first prevents the surgical field from being obscured by hemorrhage from anterior sites. Furthermore, it allows the surgeon to utilize the space and leverage more effectively. If anterior teeth were removed first, the bleeding would drain posteriorly, hindering the visibility required for the more difficult posterior extractions. **Analysis of Incorrect Options:** * **A & B (Least/Maximal):** These terms refer to the quantity or degree of force/difficulty rather than the chronological sequence of extraction. They do not represent standard surgical protocols. * **C (Last):** The anterior teeth (like canines or incisors) are typically removed last in a quadrant sequence because they are easier to access and their sockets do not provide the same level of visibility challenges when bleeding occurs. **Clinical Pearls for NEET-PG:** * **Order of Extraction:** Always extract **Maxillary teeth before Mandibular teeth** (to prevent debris from falling into lower sockets) and **Posterior teeth before Anterior teeth** (to maintain a clear, blood-free field). * **The "Canine" Exception:** The Maxillary Canine is often considered the most difficult tooth to extract due to its long root and the "canine eminence" of the alveolar bone. * **Nerve Involvement:** During the extraction of the lower third molar, the **Lingual Nerve** is the most commonly injured nerve due to its proximity to the medial aspect of the mandible.

Q: What is the most common site of oral leukoplakia?

Cheek mucosa. **Explanation:** **Leukoplakia** is defined by the WHO as "a white patch or plaque that cannot be characterized clinically or pathologically as any other disease." It is a clinical diagnosis of exclusion and is considered a **premalignant lesion** of the oral cavity. **1. Why Cheek Mucosa is Correct:** The **buccal (cheek) mucosa** is the most common site for oral leukoplakia, particularly along the line of occlusion. This is attributed to the high frequency of chronic irritation (frictional trauma from teeth) and the large surface area exposed to tobacco and betel nut products, which are the primary etiological factors. **2. Analysis of Incorrect Options:** * **Angle of mouth (A):** While common in cases of candidal leukoplakia or nutritional deficiencies, it is not the most frequent site overall. * **Soft palate (C):** This is a less common site for leukoplakia but carries a higher risk of malignant transformation compared to the buccal mucosa. * **Gingiva (D):** Though it can occur here (often associated with smokeless tobacco use), it ranks lower in incidence than the buccal mucosa. **3. Clinical Pearls for NEET-PG:** * **Most Common Site:** Buccal mucosa (Cheek). * **Site with Highest Malignant Potential:** Floor of the mouth, followed by the ventrolateral surface of the tongue and the soft palate complex. * **Etiology:** Tobacco (most common), alcohol, chronic irritation, and HPV (strains 16 and 18). * **Histopathology:** Shows hyperkeratosis, acanthosis, and varying degrees of dysplasia. * **Management:** Biopsy is mandatory to rule out malignancy. Small lesions are excised; large lesions require close follow-up or laser ablation.

Q: What is the most commonly performed shunt for hydrocephalus?

Ventriculoperitoneal. **Explanation:** The primary goal of a shunt in hydrocephalus is to divert excess Cerebrospinal Fluid (CSF) from the cerebral ventricles to another body cavity where it can be absorbed. **Ventriculoperitoneal (VP) Shunt** is the most commonly performed procedure because the peritoneum provides a large surface area for fluid absorption, is technically easier to access, and can accommodate long lengths of tubing (allowing for growth in pediatric patients). It has a lower risk of life-threatening complications compared to vascular shunts. **Analysis of Incorrect Options:** * **Ventriculopericardial/Ventriculoatrial (VA):** These divert CSF into the right atrium. They are generally second-line options used when the peritoneum is unsuitable (e.g., due to extensive adhesions or peritonitis). They carry risks of serious complications like endocarditis, pulmonary hypertension, and "shunt nephritis." * **Ventriculopleural:** CSF is diverted to the pleural cavity. This is rarely used as a primary option because it carries a risk of pleural effusion and respiratory compromise, especially in young children. * **Lumboperitoneal (LP):** This shunts fluid from the subarachnoid space in the lumbar spine to the peritoneum. It is only indicated for **communicating hydrocephalus** (e.g., Idiopathic Intracranial Hypertension) and cannot be used in obstructive hydrocephalus. **High-Yield Clinical Pearls for NEET-PG:** * **Most common complication of VP shunt:** Shunt obstruction (usually at the proximal/ventricular end). * **Most common organism in shunt infections:** *Staphylococcus epidermidis*. * **Chhabra Shunt:** A low-cost, indigenous VP shunt commonly used in developing countries. * **Normal Pressure Hydrocephalus (NPH) Triad:** Dementia, Gait Ataxia, and Urinary Incontinence ("Wet, Wobbly, and Wacky"). VP shunting is the definitive treatment.

Q: What is the treatment of choice for a stone in the submandibular duct located distal to the lingual nerve?

Intraoral removal. **Explanation:** The treatment of choice for a submandibular duct stone (sialolithiasis) depends primarily on its location. The submandibular duct (Wharton’s duct) runs along the floor of the mouth, crossing the lingual nerve. 1. **Why Intraoral Removal is Correct:** When a stone is located **distal to the lingual nerve** (closer to the duct orifice/anteriorly), it is easily accessible through the oral cavity. An **intraoral sialolithotomy** is performed by making a small incision directly over the stone in the floor of the mouth. This approach is minimally invasive, preserves the gland, and avoids the risks associated with major surgery. 2. **Why Other Options are Incorrect:** * **Submandibular Excision:** This is reserved for stones located within the gland parenchyma or proximal to the lingual nerve (posteriorly) that cannot be reached intraorally, or in cases of chronic permanent gland damage. * **Antibiotics:** These are used to treat secondary infection (sialadenitis) but do not remove the mechanical obstruction (the stone). * **Observation:** Sialolithiasis rarely resolves spontaneously and typically leads to recurrent pain and swelling (mealtime syndrome) or infection if left untreated. **High-Yield Clinical Pearls for NEET-PG:** * **80% Rule:** 80% of all salivary stones occur in the submandibular gland (due to alkaline pH, high calcium/mucin content, and antigravity flow). * **Radiopacity:** 80% of submandibular stones are radiopaque (visible on X-ray), whereas 80% of parotid stones are radiolucent. * **Imaging:** The best initial imaging for a suspected ductal stone is an **intraoral occlusal radiograph**. * **Anatomy:** The lingual nerve "loops" under Wharton’s duct from lateral to medial. Stones distal to this loop are palpable and surgically accessible intraorally.

Question 1

A 4-year-old girl presenting with a painless, mobile, cystic swelling in the midline of her neck, located just below the hyoid bone, is scheduled for tonsillectomy. The swelling measures 2x1x1 cm. An ultrasound reveals a thick-walled cystic lesion. What is the recommended management?

Accepted Answer

Surgical removal

Answer

Antibiotics

Answer

Percutaneous aspiration

Answer

Chest X-ray

Question 2

A 40-year-old patient presents with a swelling on the left lateral aspect of the neck. Examination reveals a painless swelling that moves side-to-side but not up-and-down. There is no history of tuberculosis. Laboratory investigations, including thyroid profile and CBC, are normal. Ultrasound shows a highly vascular hypoechoic mass lesion anterior to the sternocleidomastoid muscle. A CT angiogram was subsequently performed. What is the most likely diagnosis?

Accepted Answer

Carotid body paraganglioma

Answer

Fibromatosis colli

Answer

Tubercular lymph node

Answer

Soft tissue sarcoma

Question 3

What is the most common site for carcinoma of the tongue?

Accepted Answer

Lateral margin

Answer

Tip of tongue

Answer

Posterior 1/3

Answer

Ventral surface

Question 4

Fracture of a mandible with an edentulous jaw is best treated with which of the following?

Accepted Answer

External fixator

Answer

Minerva plaster

Answer

Interdental wiring

Answer

Intermaxillary elastic traction

Question 5

Which of the following is true about salivary gland tumors?

Accepted Answer

Adenoid cystic carcinoma (ACC) shows perineural spread and requires wide resection.

Answer

Malignant epithelial cell (MEC) tumors show perineural spread and require wide resection.

Answer

Malignant epithelial cell (MEC) tumors are well-encapsulated and do not require surgical excision.

Answer

Adenoid cystic carcinoma (ACC) is well-encapsulated and does not require surgical excision.

Question 6

Which teeth are removed first?

Accepted Answer

First

Answer

Least

Answer

Maximal

Answer

Last

Question 7

What is the most common site of oral leukoplakia?

Accepted Answer

Cheek mucosa

Answer

Angle of mouth

Answer

Soft palate

Answer

Gingiva

Question 8

What is the most commonly performed shunt for hydrocephalus?

Accepted Answer

Ventriculoperitoneal

Answer

Ventriculopericardial

Answer

Ventriculopleural

Answer

Lumboperitoneal

Question 9

What is the treatment of choice for a stone in the submandibular duct located distal to the lingual nerve?

Accepted Answer

Intraoral removal

Answer

Submandibular excision

Answer

Antibiotics

Answer

Observation

Question 10

Champy's plates are used for fixation in which manner?

Accepted Answer

Semirigid fixation with monocortical screws

Answer

Semirigid fixation with bicortical screws

Answer

Rigid fixation with bicortical screws

Answer

Rigid fixation with monocortical screws

Head and Neck Surgery — MCQs

Head and Neck Surgery — MCQs

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