Head and Neck Surgery Practice Questions

Q: What is true regarding the sagittal split mandibular operation?

It rarely leads to a non-union of the osteotomy site.. **Explanation:** The **Sagittal Split Ramus Osteotomy (SSRO)** is the most versatile and commonly performed procedure for correcting mandibular deformities (prognathism, retrognathism, and asymmetry). **Why Option D is Correct:** The sagittal split creates a **large surface area of cancellous bone-to-bone contact** between the proximal and distal segments. This extensive contact, combined with modern rigid internal fixation (screws or plates), ensures excellent stability and rapid primary bone healing. Consequently, **non-union is extremely rare** in this procedure. **Why Other Options are Incorrect:** * **Option A:** SSRO is primarily used for horizontal movements (advancement or setback). While it can be used in conjunction with other procedures, it is **not the ideal operation for closing an anterior open bite**; this often requires a Le Fort I osteotomy of the maxilla or a segmental mandibular procedure. * **Option B:** The most common complication of SSRO is **inferior alveolar (dental) nerve injury**. Because the osteotomy cut is made directly through the mandibular canal, even in the most skilled hands, the incidence of temporary or permanent paresthesia is high (up to 85-100% immediately post-op). * **Option C:** For mandibular setback (pushing back), the **Intraoral Vertical Subsigmoid Osteotomy (IVSO)** generally has lower morbidity regarding nerve injury compared to SSRO, as the cut is posterior to the mandibular foramen. **High-Yield Clinical Pearls for NEET-PG:** * **Indication:** Gold standard for mandibular advancement (retrognathism). * **Nerve at risk:** Inferior Alveolar Nerve (branch of V3). * **Advantage:** No external scars (entirely intraoral) and no need for prolonged intermaxillary fixation (IMF) if rigid fixation is used. * **Complication:** Neurosensory deficit is the most frequent; "Bad Split" (unfavorable fracture) is a known intraoperative risk.

Q: In which one of the following conditions is sialography contraindicated?

Acute parotitis. **Explanation:** The correct answer is **Acute parotitis**. **Why Acute Parotitis is Contraindicated:** Sialography involves the retrograde injection of a radiopaque contrast medium into the salivary ductal system. In the setting of **acute inflammation or infection** (acute parotitis), this procedure is strictly contraindicated for two primary reasons: 1. **Exacerbation of Infection:** The pressure from the injection can force bacteria and inflammatory debris deeper into the glandular parenchyma, potentially leading to abscess formation or systemic spread (sepsis). 2. **Severe Pain:** The procedure is extremely painful when the gland is already tense and inflamed. **Analysis of Incorrect Options:** * **Ductal Calculus (A):** Sialography is traditionally used to identify radiolucent stones or to visualize the degree of ductal dilatation (sialectasis) behind a stone. However, it is generally avoided if the stone completely occludes the duct. * **Chronic Parotitis (B) & Recurrent Sialoadenitis (D):** These are primary indications for sialography. The procedure helps visualize the "Sausage-link" appearance (strictures and dilatations) or "Pruned tree" appearance, helping to differentiate between chronic inflammatory conditions and autoimmune diseases like Sjögren’s syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Indications:** Sialography is the "gold standard" for visualizing ductal anatomy, strictures, and fistulae in chronic conditions. * **Contrast Media:** Oil-based contrast (e.g., Lipiodol) provides better opacification but is harder to eliminate; water-soluble contrast (e.g., Urografin) is preferred if an infection is suspected or to avoid granuloma formation. * **Modern Alternative:** Non-invasive **MR Sialography** is now often preferred as it does not require cannulation or contrast injection and can be performed even during acute phases. * **Other Contraindications:** Known allergy to iodine or contrast media.

Q: Which of the following is not used in the treatment of Frey's syndrome?

Temporalis fascia graft. **Explanation:** **Frey’s Syndrome (Gustatory Sweating)** occurs due to aberrant regeneration of the **auriculotemporal nerve** following parotidectomy. Parasympathetic fibers, which originally supplied the parotid gland, mistakenly grow to innervate the overlying sweat glands and cutaneous blood vessels. This results in sweating and flushing of the skin triggered by mastication. **Why Option B is the Correct Answer:** The **Temporalis fascia graft** is used as a **preventative measure** during the initial parotid surgery to create a physical barrier between the nerve endings and the skin. However, once Frey’s syndrome has already developed (as implied by "treatment"), a fascia graft is generally not used as a therapeutic intervention. Instead, surgical treatments for established cases involve the **Tympanic Neurectomy (Jacobson’s nerve)** to sever the parasympathetic supply. **Analysis of Incorrect Options:** * **Botulinum Toxin (A):** This is currently the **gold standard/treatment of choice** for established Frey’s syndrome. It blocks the release of acetylcholine at the neuromuscular junction and sweat glands, providing relief for several months. * **Aluminium Chloride (C):** A topical agent used to block sweat gland ducts. It is a conservative symptomatic treatment. * **Antiperspirants (D):** Topical glycopyrrolate or standard antiperspirants are used as first-line conservative management to reduce localized sweating. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Confirmed by the **Minor’s Starch-Iodine Test** (affected area turns blue-black upon eating). * **Nerve Involved:** Auriculotemporal nerve (branch of Mandibular nerve V3). * **Prophylaxis:** Interpositional barriers like the **Acellular Dermal Matrix (Alloderm)** or **SMAS flap** during parotidectomy are effective in reducing incidence.

Q: What is the best diagnostic modality for parotid swelling?

FNAC. **Explanation:** **Fine Needle Aspiration Cytology (FNAC)** is the investigation of choice for the initial evaluation of a parotid swelling. It is a safe, minimally invasive, and cost-effective procedure with high sensitivity (85-95%) and specificity for distinguishing between benign and malignant lesions. It helps the surgeon plan the extent of surgery (e.g., nerve-sparing vs. radical) without the risk of seeding tumor cells into the surrounding tissue. **Why other options are incorrect:** * **Enucleation:** This involves shelling out the tumor. It is strictly contraindicated in parotid swellings (especially Pleomorphic Adenoma) due to the high risk of recurrence caused by pseudopod rupture and tumor spillage. * **Excisional Biopsy:** This is avoided because it risks damaging the **Facial Nerve** and can lead to tumor seeding or the formation of a permanent salivary fistula. * **Superficial Parotidectomy:** This is a **therapeutic** procedure (the standard treatment for most benign parotid tumors), not a primary diagnostic modality. Diagnosis must precede definitive surgery. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Imaging:** MRI is the best imaging modality to assess soft tissue involvement and the relationship of the tumor to the facial nerve. * **Incisional Biopsy:** Absolutely contraindicated in parotid tumors. * **Most Common Tumor:** Pleomorphic Adenoma (Benign); Mucoepidermoid Carcinoma (Malignant). * **Facial Nerve Landmark:** The **Tragal pointer** is a key surgical landmark used to identify the facial nerve during parotidectomy.

Q: Which of the following is an indication for enucleation?

Both A and B. ### Explanation **1. Understanding the Concept: Enucleation vs. Marsupialization** Enucleation is the surgical process of removing a cyst in its entirety without rupture. It is the treatment of choice for most small to moderate-sized cystic lesions of the jaw. * **Odontogenic Keratocyst (OKC):** Due to its aggressive nature and high recurrence rate, the primary treatment is thorough **enucleation** (often combined with chemical cauterization using Carnoy’s solution or peripheral ostectomy). * **Recurrence:** If a cystic lesion recurs after previous conservative management (like marsupialization), definitive removal via **enucleation** is indicated to ensure all epithelial lining is cleared. **2. Analysis of Options** * **Option A (Correct):** OKC requires complete removal of the lining to prevent recurrence. * **Option B (Correct):** Recurrent lesions indicate that previous drainage or decompression failed; thus, total excision (enucleation) is required. * **Option C (Incorrect):** For **very large cysts**, enucleation is often contraindicated as an initial step. Removing a large cyst entirely can lead to a **pathological fracture** of the weakened jawbone or damage to vital structures (like the inferior alveolar nerve). In such cases, **Marsupialization** (decompression) is preferred first to allow the bone to regenerate and the cyst to shrink before definitive surgery. **3. Clinical Pearls for NEET-PG** * **Marsupialization (Partsch I):** Indicated for very large cysts, cysts involving unerupted teeth in children, or when vital structures are at risk. * **Enucleation (Partsch II):** Indicated for smaller cysts where the jaw is strong enough to withstand the procedure. * **OKC Fact:** Derived from the *dental lamina*. It has a characteristic "picket fence" or "tombstone" appearance of the basal layer on histology. * **Most common odontogenic cyst:** Radicular cyst (always associated with a non-vital tooth).

Q: Which of the following statements regarding a branchial cyst is true?

The wall consists of lymphoid tissue.. **Explanation:** **1. Why Option B is Correct:** A branchial cyst is a remnant of the **second branchial cleft** (95% of cases). Histologically, the cyst is lined by stratified squamous epithelium (or sometimes respiratory epithelium) and is characteristically surrounded by a dense layer of **lymphoid tissue** containing germinal centers. This lymphoid component is a hallmark feature, often leading to the cyst enlarging rapidly during or after an upper respiratory tract infection. **2. Why the Other Options are Incorrect:** * **Option A:** Branchial cysts are typically located at the junction of the **upper third and middle third** of the anterior border of the sternocleidomastoid muscle. They are not found in the lower third. * **Option C:** The cyst is filled with a straw-colored, mucoid fluid that contains **cholesterol crystals** (giving it an opalescent appearance), not keratinized fluid. Keratinized fluid is more characteristic of dermoid cysts. * **Option D:** Although congenital in origin, they **rarely present at birth**. They typically manifest in late childhood or early adulthood (2nd or 3rd decade of life) when the lymphoid tissue undergoes hyperplasia or the cyst becomes infected. **Clinical Pearls for NEET-PG:** * **Most Common Site:** Anterior to the upper 1/3rd of the sternocleidomastoid, at the level of the hyoid bone. * **Diagnostic Feature:** Aspiration shows **cholesterol crystals** (shimmering appearance). * **Differential Diagnosis:** Must be differentiated from a "Cold Abscess" (tuberculous lymphadenitis) or a cystic hygroma. * **Treatment:** Complete surgical excision (Sistrunk procedure is for thyroglossal cysts, not branchial cysts). Be mindful of the internal carotid artery and jugular vein during surgery.

Q: Which of the following is a characteristic clinical feature of salivary duct calculi?

Produce pain on eating. **Explanation:** The hallmark clinical presentation of salivary duct calculi (sialolithiasis) is **post-prandial pain and swelling**. When a person eats, the salivary glands are stimulated to produce and secrete saliva. If a stone obstructs the duct, the saliva cannot flow out, leading to a rapid increase in pressure within the gland. This causes acute, colicky pain and visible swelling (often referred to as "mealtime syndrome"), which subsides once the salivary flow decreases. **Analysis of Incorrect Options:** * **Option B:** Sialolithiasis is most common in the **Submandibular gland (80%)**, not the parotid. This is due to the submandibular duct (Wharton’s duct) being longer, having an upward course, and producing saliva that is more alkaline and richer in calcium and mucin. * **Option C:** While stones can lead to secondary infection (sialadenitis), they are not the primary cause of "acute parotitis." Acute parotitis is more commonly viral (Mumps) or bacterial (Staph. aureus) in dehydrated patients. * **Option D:** Unlike renal stones, salivary stones are **not** typically associated with systemic hypercalcemia or metabolic calcium disorders. They are usually a local phenomenon caused by stasis and debris. **High-Yield Clinical Pearls for NEET-PG:** * **Radiopacity:** 80% of submandibular stones are radiopaque (visible on X-ray), whereas 80% of parotid stones are radiolucent. * **Best Initial Imaging:** Ultrasound is often used first, but **Non-contrast CT** is the gold standard for detecting small stones. * **Management:** Small stones may pass with sialogogues (lemon drops); larger or proximal stones require **Sialendoscopy** or surgical excision.

Q: Which of the following swellings is not located in the midline?

Branchial cyst. To approach midline neck swellings in surgery, it is essential to distinguish between structures derived from the midline (like the thyroid primordium) and those derived from the lateral branchial arches. ### **Explanation of the Correct Answer** **C. Branchial Cyst:** This is the correct answer because a branchial cyst is a **lateral neck swelling**. It typically arises from the remnants of the **second branchial cleft**. Clinically, it presents at the junction of the upper one-third and middle one-third of the anterior border of the **sternocleidomastoid muscle**. Because it originates from the branchial apparatus (which develops laterally), it is never found in the midline. ### **Analysis of Incorrect Options** * **A. Thyroglossal Cyst:** This is the most common midline developmental cyst. It occurs anywhere along the path of the thyroglossal duct (from the foramen caecum to the thyroid isthmus). A classic sign is that it **moves upward on protrusion of the tongue**. * **B. Sublingual Dermoid:** These are sequestration dermoids found in the midline of the floor of the mouth (submental region). They can be suprahyoid and are strictly midline. * **D. Submental Lymph Node Enlargement:** The submental triangle is a midline space bounded by the anterior bellies of the digastric muscles and the hyoid bone. Enlargement of these nodes (due to infections or malignancy of the lower lip/floor of mouth) presents as a midline swelling. ### **High-Yield NEET-PG Pearls** * **Most common midline swelling:** Thyroglossal cyst. * **Most common lateral neck swelling:** Lymphadenopathy (inflammatory or metastatic). * **Branchial Cyst Fluid:** Classically contains **cholesterol crystals** (shimmering appearance). * **Movement on Deglutition:** Both Thyroglossal cysts and Thyroid swellings move with swallowing, but only the **Thyroglossal cyst moves with tongue protrusion**.

Question 1

Carcinoma of the cheek:

Accepted Answer

Has a recognized association with chewing betel nut.

Answer

Characteristically is columnar-celled.

Answer

Has a recognized association with chewing gum.

Answer

Has a recognized association with geographic tongue.

Question 2

Myoplasty and sulcus extension procedures are helpful in:

Accepted Answer

Increasing retention and stability

Answer

Increasing retention

Answer

Increasing stability

Answer

Increasing support

Question 3

What is true regarding the sagittal split mandibular operation?

Accepted Answer

It rarely leads to a non-union of the osteotomy site.

Answer

It is a good operation for closing an anterior open bite.

Answer

It has a very low incidence of inferior dental nerve anesthesia or paresthesia with a skilled operator.

Answer

It has a lower morbidity when used for pushing back a mandible than an intraoral vertical subsigmoid osteotomy.

Question 4

In which one of the following conditions is sialography contraindicated?

Accepted Answer

Acute parotitis

Answer

Ductal calculus

Answer

Chronic parotitis

Answer

Recurrent sialoadenitis

Question 5

Which of the following is not used in the treatment of Frey's syndrome?

Accepted Answer

Temporalis fascia graft

Answer

Botulinum toxin

Answer

Aluminium chloride

Answer

Antiperspirants

Question 6

What is the best diagnostic modality for parotid swelling?

Accepted Answer

FNAC

Answer

Enucleation

Answer

Superficial parotidectomy

Answer

Excisional biopsy

Question 7

Which of the following is an indication for enucleation?

Accepted Answer

Both A and B

Answer

Treatment of odontogenic keratocyst

Answer

Recurrence of cystic lesions of any cyst type

Answer

Large cyst to avoid pathological fracture of the jaw

Question 8

Which of the following statements regarding a branchial cyst is true?

Accepted Answer

The wall consists of lymphoid tissue.

Answer

Seen deep to the lower third of the sternocleidomastoid muscle.

Answer

Filled with keratinized fluid.

Answer

Typically presents at birth.

Question 9

Which of the following is a characteristic clinical feature of salivary duct calculi?

Accepted Answer

Produce pain on eating

Answer

Are commonest in the parotid ducts

Answer

Are a common cause of acute parotitis

Answer

Are associated with hypercalcemic states

Question 10

Which of the following swellings is not located in the midline?

Accepted Answer

Branchial cyst

Answer

Thyroglossal cyst

Answer

Sublingual dermoid

Answer

Submental lymph node enlargement

Head and Neck Surgery — MCQs

Head and Neck Surgery — MCQs

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