Head and Neck Surgery Practice Questions

Q: What is the primary indication for a 'commando operation' in surgical oncology?

Carcinoma of the oral cavity. **Explanation:** The **Commando Operation** (Combined Mandibulectomy and Neck Dissection Operation) is a major surgical procedure primarily indicated for advanced **Carcinoma of the Oral Cavity** (Option D), particularly when the tumor involves the floor of the mouth, the tongue, or the lower alveolus and has invaded or is in close proximity to the mandible. The procedure involves a "composite resection" consisting of three main components: 1. **Resection of the primary intraoral tumor.** 2. **Partial or hemi-mandibulectomy** (removal of a portion of the lower jaw). 3. **Ipsilateral Radical Neck Dissection** (removal of cervical lymph nodes). **Why other options are incorrect:** * **Colon cancer (A):** Managed via colectomy or anterior resection; it does not involve head and neck structures. * **Carcinoma of the esophagus (B):** Managed via esophagectomy (e.g., Ivor-Lewis or McKeown procedure). * **Parotid gland tumor (C):** Managed via superficial or total parotidectomy, usually sparing the mandible unless there is direct massive invasion. **High-Yield Clinical Pearls for NEET-PG:** * **Etymology:** The name is derived from the "Commando" units of WWII, reflecting the aggressive and "tough" nature of the surgery. * **Reconstruction:** Modern commando operations often utilize a **Pectoralis Major Myocutaneous (PMMC) flap** or a free fibula flap for mandibular reconstruction. * **Key Landmark:** The **marginal mandibular nerve** (branch of the Facial nerve) is at high risk during this procedure; injury leads to drooping of the corner of the mouth. * **Indication:** It is typically reserved for **T4 lesions** of the oral cavity where bone invasion is present.

Q: A vertical section of the ramus of the mandible is performed in which condition?

Mandibular protrusion. **Explanation:** The **Vertical Subsygmoid Osteotomy (VSO)** or vertical ramus osteotomy is a surgical procedure primarily used to correct **Mandibular Protrusion (Prognathism)**. In this procedure, a vertical cut is made from the sigmoid notch down to the lower border of the mandible, posterior to the mandibular foramen. This allows the tooth-bearing segment of the mandible to be slid backward (setback) to achieve a normal occlusion. It is preferred for large setbacks because it is technically simpler and carries a lower risk of inferior alveolar nerve injury compared to the Sagittal Split Osteotomy (SSO). **Analysis of Options:** * **Mandibular Retrusion (Option B):** This condition (Retrognathism) requires the mandible to be moved forward. The **Bilateral Sagittal Split Osteotomy (BSSO)** is the gold standard here, as it provides a broad surface area for bone healing and allows for stable advancement. * **Maxillary Prognathism/Retrognathism (Options C & D):** These are deformities of the upper jaw. They are typically corrected using the **Le Fort I Osteotomy**, which allows the maxilla to be repositioned in three dimensions. **Clinical Pearls for NEET-PG:** * **BSSO (Bilateral Sagittal Split Osteotomy):** The most versatile procedure; used for both mandibular advancement (retrusion) and setback (protrusion). * **Genioplasty:** Specifically refers to the surgical repositioning of the chin point only, without affecting occlusion. * **Distraction Osteogenesis:** Often used for severe mandibular hypoplasia (e.g., Pierre Robin Sequence). * **Nerve at Risk:** The **Inferior Alveolar Nerve** is the most commonly discussed structure during mandibular osteotomies.

Q: Alveolitis sicca dolorosa is otherwise known as?

Dry socket. **Explanation:** **Alveolitis sicca dolorosa** is the formal medical term for **Dry Socket**, a common post-extraction complication in dentistry and oral surgery. 1. **Why "Dry Socket" is correct:** The term literally translates to "painful dry inflammation of the alveolus." It occurs when the blood clot at the site of a tooth extraction fails to form, dislodges, or dissolves prematurely (fibrinolysis). This exposes the underlying alveolar bone and nerve endings to the oral environment, leading to intense pain, a foul odor (halitosis), and an empty-looking "dry" socket. It typically manifests 3–5 days post-extraction. 2. **Analysis of Incorrect Options:** * **Trigeminal neuralgia (A):** A chronic pain condition affecting the 5th cranial nerve, characterized by sudden, severe, electric shock-like facial pain. While it involves facial pain, it is neurological, not inflammatory or post-surgical. * **Sicca Syndrome (B):** Also known as Sjögren’s syndrome, this is an autoimmune condition characterized by dry eyes (xerophthalmia) and dry mouth (xerostomia) due to lymphocytic infiltration of exocrine glands. * **Myospherulosis (D):** A rare iatrogenic swelling caused by the interaction of extravasated blood with petroleum-based antibiotic dressings (like tetracycline ointment) used in surgical cavities. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Smoking (most significant), oral contraceptives (estrogen increases fibrinolysis), and mandibular third molar extractions. * **Management:** Treatment is symptomatic. It involves gentle irrigation with saline and placement of a medicated dressing (e.g., **Zinc Oxide Eugenol** or Alveogyl) to provide immediate pain relief. Antibiotics are generally not required unless systemic infection is present.

Q: Mid tracheostomy is performed at which level of the tracheal rings?

3rd and 4th tracheal rings. **Explanation:** Tracheostomy is a life-saving surgical procedure where an opening is made in the anterior wall of the trachea. The classification of tracheostomy (High, Mid, or Low) is determined by its relationship to the **isthmus of the thyroid gland**, which typically overlies the 2nd, 3rd, and 4th tracheal rings. * **Correct Answer (B):** A **Mid Tracheostomy** is performed at the level of the **2nd, 3rd, or 4th tracheal rings**. This is the most preferred site for elective tracheostomy. During the procedure, the thyroid isthmus is either retracted upwards/downwards or divided to gain access to these rings. This level provides a stable airway while minimizing complications associated with the larynx or the mediastinum. **Analysis of Incorrect Options:** * **Option A (1st and 2nd rings):** This constitutes a **High Tracheostomy**. It is generally avoided because proximity to the cricoid cartilage can lead to perichondritis and subsequent **subglottic stenosis**, a difficult-to-treat complication. * **Option C & D (5th ring and below):** These constitute a **Low Tracheostomy**. These are technically difficult due to the increasing depth of the trachea as it descends. There is also a significant risk of injury to the **innominate artery** (brachiocephalic trunk) and the pleura, potentially leading to fatal tracheo-innominate fistulas or pneumothorax. **Clinical Pearls for NEET-PG:** * **Emergency Airway:** The procedure of choice in an acute "cannot intubate, cannot ventilate" scenario is **Cricothyroidotomy**, not tracheostomy. * **Standard Incision:** A horizontal (transverse) skin incision is preferred for better cosmesis, though a vertical incision may be used in emergencies for speed. * **Bjork Flap:** An inferiorly based tracheal flap (usually at the 3rd ring) sometimes used to facilitate tube re-insertion.

Q: A 25-year-old male patient presents with a bony expansile swelling of the right body of the mandible and mild paresthesia of the right inferior dental nerve. An OPG shows a multilocular radiolucency without root resorption. What would be your choice of next investigation?

Aspiration cytology. ### Explanation The clinical presentation of a bony expansile swelling in the mandible of a young adult, accompanied by **paresthesia** and a **multilocular radiolucency** on OPG, should immediately raise suspicion for a **Central Giant Cell Granuloma (CGCG)** or, more critically, a **Central Hemangioma of the bone**. **Why Aspiration Cytology is the Correct Choice:** In the mandible, multilocular radiolucencies can represent benign tumors (like Ameloblastoma), cysts (OKC), or vascular malformations. **Aspiration cytology (or Fine Needle Aspiration)** is the mandatory next step to rule out a vascular lesion. If the lesion is a central hemangioma, an unplanned incisional or excision biopsy could lead to **uncontrollable, life-threatening hemorrhage**. A "bloody tap" on aspiration confirms a vascular origin and dictates a completely different surgical approach (e.g., embolization). **Analysis of Incorrect Options:** * **Excision Biopsy:** This is contraindicated as an initial step. If the lesion is vascular, it can lead to fatal bleeding. If it is an Ameloblastoma, simple excision is inadequate (resection is needed). * **CT Scan:** While useful for assessing cortical expansion and surgical planning, it does not provide a tissue diagnosis or rule out the vascular nature as effectively as aspiration in the initial workup. * **PET Bone Scan:** This is used for detecting metabolic activity in malignancies or metastases; it has no role in the primary evaluation of a benign-appearing mandibular swelling. **Clinical Pearls for NEET-PG:** * **Rule of Thumb:** Always aspirate any central bony lesion of the jaws before biopsy to rule out "the great imitator"—Central Hemangioma. * **Root Resorption:** Ameloblastomas typically cause root resorption, whereas CGCG and OKC often do not. * **Paresthesia:** In benign-looking mandibular lesions, paresthesia is a "red flag" that may suggest an aggressive CGCG or a malignancy.

Q: During the surgical extraction of a lower impacted right molar, to what extent is bone removal typically performed?

Up to the cementoenamel junction (CEJ). **Explanation:** The surgical extraction of an impacted mandibular third molar (lower right molar) requires a systematic approach to bone removal to facilitate a path of exit for the tooth while minimizing trauma to surrounding structures. **Why Option B is Correct:** The standard surgical principle for bone guttering is to remove bone **up to the cementoenamel junction (CEJ)**. Removing bone to this level exposes the greatest horizontal circumference of the crown and provides a clear point of application for elevators. This "guttering" technique (usually performed on the buccal and distal aspects) creates a space that allows the tooth to be luxated or sectioned without excessive force, thereby preventing jaw fractures or damage to the adjacent second molar. **Analysis of Incorrect Options:** * **Option A:** Exposing the "maximum dimension" is vague. While the crown must be cleared, the CEJ is the specific anatomical landmark that defines the boundary between the crown and root, serving as the clinical endpoint for bone removal. * **Option C & D:** Removing bone to the **furcation** or **half the root length** is excessive and contraindicated. Deep bone removal increases the risk of injuring the **Inferior Alveolar Nerve (IAN)**, weakening the mandible, and causing significant post-operative edema and pain. **Clinical Pearls for NEET-PG:** * **Winter’s Classification:** Used to describe the angulation of the impacted tooth (Mesioangular is the most common; Vertical is the easiest; Distoangular is the most difficult to remove). * **Pell and Gregory Classification:** Based on the relationship to the ramus and the occlusal plane. * **Safety Zone:** Bone removal should be restricted to the buccal and distal sides; **lingual bone** is never removed to avoid damaging the **Lingual Nerve**.

Q: Modified radical neck dissection includes which of the following?

Levels I-V. ### Explanation **Concept Overview:** Neck dissections are classified based on the lymph node levels removed and the preservation of non-lymphatic structures. A **Radical Neck Dissection (RND)** involves the removal of lymph node **Levels I through V**, along with three key structures: the Sternocleidomastoid muscle (SCM), the Internal Jugular Vein (IJV), and the Spinal Accessory Nerve (SAN). **Why Option D is Correct:** A **Modified Radical Neck Dissection (MRND)** also involves the systematic removal of lymph node **Levels I-V** (the same nodal footprint as RND). The "Modified" aspect refers to the **preservation** of one or more of the three non-lymphatic structures (SAN, IJV, or SCM). Since the question asks what levels are included, Levels I-V is the standard anatomical boundary for both RND and MRND. **Analysis of Incorrect Options:** * **Option A (Levels I-IV):** This typically describes a *Supraomohyoid* neck dissection (a type of Selective Neck Dissection) often used in oral cavity cancers, but it omits Level V (posterior triangle). * **Option B (Levels I-VII):** Level VI (central compartment) and Level VII (superior mediastinal) are not part of a standard MRND; they are addressed in thyroid or esophageal malignancies. * **Option C (Levels I-III):** This is a *Selective Neck Dissection* (Supraomohyoid) often performed for N0 necks in oral cavity squamous cell carcinoma. **High-Yield Clinical Pearls for NEET-PG:** * **MRND Types:** * **Type I:** SAN preserved. * **Type II:** SAN and IJV preserved. * **Type III (Functional Neck Dissection):** SAN, IJV, and SCM all preserved. * **Boundary of Level V:** Defined by the posterior border of the SCM (anteriorly), the anterior border of the Trapezius (posteriorly), and the Clavicle (inferiorly). * **Most common nerve injured** during neck dissection leading to shoulder drop: **Spinal Accessory Nerve.**

Q: A potato tumor is a tumor of which of the following structures?

Carotid body. **Explanation:** The term **"Potato Tumor"** is a classic clinical eponym for a **Carotid Body Tumor (Chemodectoma)**. **1. Why Carotid Body is Correct:** The carotid body is a chemoreceptor located at the bifurcation of the common carotid artery. A tumor arising from the paraganglion cells here is highly vascular and slow-growing. It is called a "potato tumor" because of its characteristic **firm, oval, and lobulated appearance**, which resembles a potato. Clinically, it presents as a painless neck mass that is **mobile horizontally but fixed vertically** (Fontaine’s Sign), as it is tethered to the carotid bifurcation. **2. Why Incorrect Options are Wrong:** * **Sternocleidomastoid muscle:** Tumors of this muscle (like a fibromatosis colli or "sternomastoid tumor of infancy") are associated with torticollis, not the "potato tumor" morphology. * **Carotid sinus:** The carotid sinus is a baroreceptor (pressure sensor) located in the adventitia of the carotid artery. While anatomically adjacent to the carotid body, it is a physiological structure, not the tissue of origin for this specific neoplasm. **3. High-Yield Clinical Pearls for NEET-PG:** * **Lyre Sign:** On angiography, the tumor causes characteristic widening/splaying of the carotid bifurcation (displacement of internal and external carotid arteries). * **Shamblin Classification:** Used to grade the tumor based on its involvement/encasement of the carotid vessels. * **Histology:** Features a **"Zellballen" pattern** (nests of chief cells surrounded by sustentacular cells). * **Rule of 10s:** Approximately 10% are bilateral, 10% are familial, and 10% are malignant. * **Treatment:** Surgical excision is the mainstay; preoperative embolization may be used to reduce vascularity.

Question 1

What is the primary indication for a 'commando operation' in surgical oncology?

Accepted Answer

Carcinoma of the oral cavity

Answer

Colon cancer

Answer

Carcinoma of the esophagus

Answer

Parotid gland tumor

Question 2

A vertical section of the ramus of the mandible is performed in which condition?

Accepted Answer

Mandibular protrusion

Answer

Mandibular retrusion

Answer

Maxillary prognathism

Answer

Maxillary retrognathism

Question 3

What is the most common cause of cellulitis of the face?

Accepted Answer

Pericoronitis

Answer

Trauma

Answer

Abscess

Answer

Bacterial infection

Question 4

Alveolitis sicca dolorosa is otherwise known as?

Accepted Answer

Dry socket

Answer

Trigeminal neuralgia

Answer

Sicca Syndrome

Answer

Myospherulosis

Question 5

Mid tracheostomy is performed at which level of the tracheal rings?

Accepted Answer

3rd and 4th tracheal rings

Answer

1st and 2nd tracheal rings

Answer

5th and 6th tracheal rings

Answer

7th and 8th tracheal rings

Question 6

A 25-year-old male patient presents with a bony expansile swelling of the right body of the mandible and mild paresthesia of the right inferior dental nerve. An OPG shows a multilocular radiolucency without root resorption. What would be your choice of next investigation?

Accepted Answer

Aspiration cytology

Answer

Excision biopsy

Answer

CT scan

Answer

PET bone scan

Question 7

During the surgical extraction of a lower impacted right molar, to what extent is bone removal typically performed?

Accepted Answer

Up to the cementoenamel junction (CEJ)

Answer

To expose the maximum dimension of the tooth

Answer

Up to the furcation area

Answer

Up to half the length of the roots

Question 8

Sistrunk's operation consists of?

Accepted Answer

Excision of central part of hyoid bone and cone of tongue muscle up to foramen cecum

Answer

Excision of hyoid bone and cone of tongue muscle

Answer

Excision of hyoid bone and the cyst

Answer

Excision of cyst only

Question 9

Modified radical neck dissection includes which of the following?

Accepted Answer

Levels I-V

Answer

Levels I-IV

Answer

Levels I-VII

Answer

Levels I-III

Question 10

A potato tumor is a tumor of which of the following structures?

Accepted Answer

Carotid body

Answer

Sternocleidomastoid muscle

Answer

Carotid sinus

Answer

None of the above

Head and Neck Surgery — MCQs

Head and Neck Surgery — MCQs

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