Head and Neck Surgery Practice Questions

Q: What is the main causative agent of Ludwig's angina?

Aerobic streptococci. **Explanation:** Ludwig’s angina is a rapidly spreading, potentially life-threatening **cellulitis** of the submandibular, sublingual, and submental spaces. **1. Why Aerobic Streptococci is correct:** The infection is typically polymicrobial, involving both aerobic and anaerobic flora from the oral cavity. However, **Alpha-hemolytic streptococci (Aerobic/Viridans group)** are the most frequently isolated organisms. These bacteria initiate the infection, creating a synergistic environment that allows anaerobes to flourish. In the context of NEET-PG, while it is a mixed infection, **Streptococci** (specifically aerobic/viridans) is recognized as the primary causative agent. **2. Analysis of Incorrect Options:** * **Anaerobic streptococci (A):** While anaerobes like *Bacteroides* and *Peptostreptococcus* are often present due to the gangrenous nature of the infection, they are usually secondary to the initial aerobic streptococcal invasion. * **Staphylococci (C):** *Staphylococcus aureus* is occasionally isolated, particularly in immunocompromised patients or following trauma, but it is not the "main" or most common cause compared to Streptococci. * **Legionella infection (D):** *Legionella* typically causes atypical pneumonia (Legionnaires' disease) and is not associated with deep neck space infections or dental pathology. **Clinical Pearls for NEET-PG:** * **Source:** The most common cause is a **dental infection** (usually the 2nd or 3rd mandibular molar). * **Clinical Features:** Characterized by "woody" or brawny edema of the neck, tongue protrusion (elevation of the floor of the mouth), and absence of fluctuance (it is a cellulitis, not an abscess). * **Management Priority:** The most critical step is **Airway Management**, followed by IV antibiotics and surgical decompression if necessary. * **Key Sign:** Look for "Hot potato voice" and drooling in clinical vignettes.

Q: An Erich arch bar may be used as all of the following except?

A compression band. ### Explanation The **Erich arch bar** is a semi-rigid stainless steel bar with hooks, commonly used in the management of maxillofacial trauma. It is primarily used to achieve **Intermaxillary Fixation (IMF)** or Mandibulomaxillary Fixation (MMF) to restore the patient's pre-traumatic dental occlusion. **Why "Compression Band" is the Correct Answer:** In the biomechanics of fracture healing, a **compression band** (or compression plating) actively pushes two bone fragments together to promote primary bone healing. An arch bar is applied to the teeth, not directly to the bone fragments in a way that generates active compression across a fracture line. Therefore, it cannot function as a compression band. **Analysis of Incorrect Options:** * **A. Intermaxillary Fixation:** This is the most common use. Arch bars are wired to the upper and lower dental arches, and wires or elastics are then used to bridge the two, locking the jaws together. * **B. Splint for mobile dentoalveolar segment:** Arch bars provide stability to loose teeth or fractured alveolar bone segments by splinting them to adjacent stable teeth. * **D. Tension Band:** When applied to the "tension side" of a mandibular fracture (the alveolar/superior border), the arch bar acts as a **tension band**. It resists the distracting forces of the muscles of mastication, converting them into compressive forces at the lower (basal) border of the mandible. **High-Yield Clinical Pearls for NEET-PG:** * **Material:** Usually made of stainless steel. * **Placement:** The hooks should always point **downward** on the mandible and **upward** on the maxilla to facilitate the placement of wires/elastics. * **Indication:** Indicated in minimally displaced fractures or as an adjunct to Open Reduction Internal Fixation (ORIF). * **Contraindication:** Avoid in patients with severe respiratory distress or those at high risk of emesis (due to aspiration risk if the jaws are wired shut).

Q: Chemical cauterization in odontogenic keratocyst is done by?

Carnoy's solution. **Explanation:** **Odontogenic Keratocyst (OKC)** is known for its high recurrence rate due to its thin, friable lining and the presence of "daughter cysts" or "satellite cysts" in the surrounding bony wall. To minimize recurrence after enucleation, chemical cauterization is employed to eliminate these residual microscopic cells. **Why Carnoy’s Solution is Correct:** Carnoy’s solution is the gold standard for chemical cauterization in OKC. It is a potent fixative composed of **absolute alcohol, chloroform, glacial acetic acid, and ferric chloride**. It penetrates the bone to a depth of approximately 1.5 mm, effectively devitalizing any remaining epithelial remnants or satellite cysts without causing extensive bone necrosis. **Analysis of Incorrect Options:** * **A. Hydrogen peroxide:** While used as a hemostatic agent and for wound debridement, it lacks the tissue-fixing properties required to penetrate bone and prevent cyst recurrence. * **C. Superoxide solution:** These are typically used as high-level disinfectants for instruments or topical antiseptics; they do not have a role in chemical bone cauterization. * **D. Betadine (Povidone-iodine):** This is a standard antiseptic used for skin preparation and wound irrigation. It does not possess the chemical potency to fix tissues or treat odontogenic tumors. **NEET-PG High-Yield Pearls:** * **Modified Carnoy’s Solution:** Due to the carcinogenic potential of chloroform, it is often omitted in modern practice (Modified Carnoy’s). * **Recurrence:** OKC has a recurrence rate of up to 30-60% with simple enucleation; Carnoy’s solution significantly reduces this. * **Association:** Multiple OKCs are a hallmark of **Gorlin-Goltz Syndrome** (Nevoid Basal Cell Carcinoma Syndrome). * **Alternative:** Liquid nitrogen (cryosurgery) is another method used to achieve similar results.

Q: Neurofibromatosis is associated with which of the following tumors?

Pheochromocytoma. **Explanation:** **Neurofibromatosis Type 1 (NF1)**, also known as von Recklinghausen disease, is an autosomal dominant neuroectodermal disorder caused by a mutation in the *NF1* gene on chromosome 17. The correct answer is **Pheochromocytoma** because NF1 is part of the classic "neurocutaneous syndromes" that predispose patients to catecholamine-secreting tumors of the adrenal medulla. While the incidence of pheochromocytoma in NF1 patients is relatively low (approx. 1–5%), it is a well-established clinical association that must be screened for if a patient presents with hypertension. **Analysis of Incorrect Options:** * **A. Papillary Carcinoma:** This is the most common thyroid malignancy. It is associated with *FAP (Gardner Syndrome)* or *Cowden Syndrome*, but not typically with Neurofibromatosis. * **B. Islet Cell Tumor & D. Glucagonoma:** These are pancreatic neuroendocrine tumors (NETs). They are classically associated with **Multiple Endocrine Neoplasia Type 1 (MEN1)**, not NF1. **High-Yield Clinical Pearls for NEET-PG:** * **NF1 Associations:** Lisch nodules (iris hamartomas), Café-au-lait spots, Axillary freckling (Crowe sign), Optic gliomas, and Sphenoid wing dysplasia. * **Pheochromocytoma Rule of 10s:** 10% bilateral, 10% malignant, 10% extra-adrenal (Paraganglioma), and 10% pediatric. * **Other Syndromes with Pheochromocytoma:** MEN 2A, MEN 2B, von Hippel-Lindau (VHL) disease, and Sturge-Weber syndrome. * **Mnemonic for NF1:** "CAFE SPOT" (Café-au-lait, Axillary freckling, Fibromas, Eye [Lisch nodules], Skeletal [Sphenoid dysplasia], Pheochromocytoma, Optic Tumor).

Q: What is a common consequence of impacted canines?

May damage the roots of adjacent teeth. **Explanation:** Impacted maxillary canines are a common clinical challenge in pediatric dentistry and orthodontics, second only to third molars in frequency of impaction. **Why Option B is correct:** The most significant and common complication of an impacted canine is **root resorption of adjacent teeth**, particularly the lateral and central incisors. As the canine attempts to erupt along an abnormal path, the pressure and proximity of its follicle can lead to the destruction of the cementum and dentin of neighboring roots. Studies suggest that up to 50% of cases involving impacted canines show some degree of root resorption on CBCT imaging. **Analysis of Incorrect Options:** * **Option A:** While impacted teeth *can* become ankylosed (fused to the bone), it is not the most common consequence. Ankylosis is more frequently associated with primary molars or teeth that have undergone trauma. * **Option C:** While canines are vital for "canine-guided occlusion" and aesthetic lip support, "good function" is not impossible without them. Premolars can often be orthodontically moved or "camouflaged" to take over their functional role. * **Option D:** Physiologically, teeth usually erupt when **two-thirds to three-quarters** of their root formation is complete. Waiting for complete root formation often leads to the tooth losing its eruptive force, making the impaction permanent. **NEET-PG High-Yield Pearls:** * **Incidence:** Maxillary canines are impacted 20 times more frequently than mandibular canines. * **Palatal vs. Buccal:** Palatal impactions are more common (85%) than buccal impactions (15%). * **Guidance Theory:** The lateral incisor root acts as a guide for canine eruption; if the lateral incisor is peg-shaped or absent, the risk of canine impaction increases. * **Management:** Surgical exposure followed by orthodontic traction is the gold standard treatment.

Q: In modified neck dissection, surgeons must be careful to avoid shoulder syndrome. All of the following are parts of shoulder syndrome, EXCEPT:

Normal electromyographic finding. **Explanation:** **Shoulder Syndrome** is a classic complication following neck dissection, primarily caused by injury or sacrifice of the **Spinal Accessory Nerve (CN XI)**. This nerve provides motor innervation to the trapezius muscle, which is essential for stabilizing the scapula and elevating the shoulder. 1. **Why Option D is the Correct Answer:** Since the syndrome is fundamentally a result of denervation of the trapezius muscle, an **Electromyography (EMG)** will show **abnormal findings**, such as denervation potentials (fibrillations) or decreased motor unit recruitment. A "normal" EMG finding is inconsistent with the pathophysiology of nerve injury; hence, it is the "Except" option. 2. **Analysis of Incorrect Options:** * **Pain (B):** This is often the most distressing symptom, resulting from the strain on the shoulder joint capsule and rhomboid muscles as they try to compensate for the paralyzed trapezius. * **Shoulder Drooping (C):** Loss of trapezius tone leads to an inferior displacement of the scapula and a visible "drop" of the shoulder on the affected side. * **Restricted Range of Movement (A):** Patients typically struggle with abduction of the arm above 90 degrees because the scapula cannot be rotated upward to support the humeral head. **High-Yield Clinical Pearls for NEET-PG:** * **Modified Radical Neck Dissection (MRND):** Type I preserves the Spinal Accessory Nerve; therefore, Shoulder Syndrome is less common compared to Radical Neck Dissection (RND). * **Nerve Anatomy:** The Spinal Accessory Nerve is most vulnerable at **Erb’s Point** (posterior border of the sternocleidomastoid). * **Clinical Sign:** Look for a "winged scapula" that is displaced laterally and downward (unlike Long Thoracic Nerve palsy, where the scapula moves medially and upward).

Q: Delphian lymph nodes act as sentinel lymph nodes in which of the following?

Laryngeal cancer. **Explanation:** The **Delphian lymph nodes** (pre-laryngeal nodes) are located in the midline, sitting on the cricothyroid membrane. They are named after the "Oracle of Delphi" because their enlargement often "prophesies" or predicts the presence of underlying malignancy or significant pathology. **Why Laryngeal Cancer is Correct:** The Delphian nodes receive primary lymphatic drainage from the **subglottic region of the larynx**, the pyriform sinus, and the thyroid gland (specifically the isthmus and upper lobes). In clinical practice, they act as sentinel nodes for laryngeal cancer; their involvement often indicates a higher risk of recurrence and signifies a poor prognosis, frequently necessitating a total laryngectomy and neck dissection. **Why Other Options are Incorrect:** * **Nasopharyngeal Carcinoma:** The primary drainage for the nasopharynx is to the **Retro-pharyngeal nodes** (Nodes of Rouviere) and the upper deep cervical nodes (Level II). * **Parotid Cancer:** The parotid gland drains primarily into the **intra-parotid** and **periparotid nodes**, and subsequently to Level II of the neck. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Level VI of the cervical lymph nodes (Anterior compartment). * **Drainage:** Larynx (subglottis), Thyroid (isthmus), and Piriform sinus. * **Clinical Significance:** If palpable, they are highly suggestive of **metastatic laryngeal/hypopharyngeal carcinoma** or **papillary thyroid carcinoma**. * **Surgical Note:** Their involvement in thyroid cancer often dictates the need for a central compartment neck dissection.

Question 1

What is the main causative agent of Ludwig's angina?

Accepted Answer

Aerobic streptococci

Answer

Anaerobic streptococci

Answer

Staphylococci

Answer

Legionella infection

Question 2

During extraction of an upper first molar, the mesiobuccal root is missing and is suspected to have been pushed into the maxillary sinus. Which of the following flaps cannot be used to close an oroantral fistula?

Accepted Answer

Mucous flap

Answer

Buccal flap

Answer

Palatal flap

Answer

Tongue flap

Question 3

An Erich arch bar may be used as all of the following except?

Accepted Answer

A compression band

Answer

A bar for intermaxillary fixation

Answer

A splint for a mobile dentoalveolar segment

Answer

A tension band

Question 4

Chemical cauterization in odontogenic keratocyst is done by?

Accepted Answer

Carnoy's solution

Answer

Hydrogen peroxide

Answer

Superoxide solution

Answer

Betadine

Question 5

Neurofibromatosis is associated with which of the following tumors?

Accepted Answer

Pheochromocytoma

Answer

Papillary carcinoma

Answer

Islet cell tumor

Answer

Glucagonoma

Question 6

What is a common consequence of impacted canines?

Accepted Answer

May damage the roots of adjacent teeth

Answer

Most likely to be ankylosed

Answer

Good function is impossible without them

Answer

They will not erupt until root formation is complete

Question 7

In modified neck dissection, surgeons must be careful to avoid shoulder syndrome. All of the following are parts of shoulder syndrome, EXCEPT:

Accepted Answer

Normal electromyographic finding

Answer

Restricted range of movement

Answer

Pain

Answer

Shoulder drooping

Question 8

Trismus in oral cancer patients is most severe in those treated with which of the following modalities?

Accepted Answer

Surgery and Radiotherapy

Answer

Chemotherapy alone

Answer

Surgery alone

Answer

Treatment is not related to the severity of trismus

Question 9

Delphian lymph nodes act as sentinel lymph nodes in which of the following?

Accepted Answer

Laryngeal cancer

Answer

Nasopharyngeal carcinoma

Answer

Parotid cancer

Answer

All of the above

Question 10

When an extraoral vertical subsigmoid osteotomy is performed, which of the following is false?

Accepted Answer

Postoperative morbidity is reduced.

Answer

Surgical access is easier than from an intraoral operation.

Answer

The position of the lingula can be found by palpating a small bony protuberance on the lateral surface of the ramus.

Answer

The distance the mandible can be pushed back is limited by bony obstruction to the coronoid process.

Head and Neck Surgery — MCQs

Head and Neck Surgery — MCQs

On this page

Practice by Chapter

Want unlimited practice?