Head and Neck Surgery Practice Questions

Q: Which structure is preserved during modified radical neck dissection?

Sternocleidomastoid muscle. **Explanation:** The classification of neck dissections is a high-yield topic in surgery. To understand the correct answer, one must differentiate between a **Radical Neck Dissection (RND)** and a **Modified Radical Neck Dissection (MRND)**. **1. Why Option C is Correct:** In a **Radical Neck Dissection (RND)**, all lymph nodes from levels I-V are removed along with three non-lymphatic structures: the **Sternocleidomastoid (SCM) muscle**, the **Internal Jugular Vein (IJV)**, and the **Spinal Accessory Nerve (SAN)**. A **Modified Radical Neck Dissection (MRND)** involves the same lymph node clearance but **preserves** one or more of these three non-lymphatic structures. Therefore, the SCM is a structure specifically preserved in MRND (Types II and III). **2. Analysis of Incorrect Options:** * **Phrenic Nerve (A):** This is not part of the standard RND template; it lies deep to the prevertebral fascia and is routinely preserved in both RND and MRND to avoid diaphragmatic palsy. * **Submandibular Gland (B):** This is routinely removed in both RND and MRND as part of the Level Ib lymph node clearance. * **Thoracic Duct (D):** This is always preserved unless it is accidentally injured or involved by a tumor (usually on the left side). It is not one of the three defining structures that differentiate RND from MRND. **Clinical Pearls for NEET-PG:** * **MRND Type I:** Preserves the Spinal Accessory Nerve. * **MRND Type II:** Preserves SAN and Internal Jugular Vein. * **MRND Type III (Functional Neck Dissection):** Preserves all three (SAN, IJV, and SCM). * **Selective Neck Dissection:** Only specific lymph node levels are removed (e.g., Supraomohyoid dissection for oral cavity cancers).

Q: Which of the following statements regarding thyroglossal cysts is not true?

Rarely can contain foci of follicular carcinoma. ### Explanation **1. Why Option C is the Correct (False) Statement:** While malignancy in a thyroglossal cyst is rare (occurring in 80%), not follicular carcinoma. Follicular carcinoma is exceptionally rare in this location because the embryonic thyroid primordium lacks the environment typically required for follicular neoplastic transformation. **2. Analysis of Other Options:** * **Option A (True):** The hyoid bone is the most common site. Approximately 80% of cysts are found in juxtaposition to the hyoid (subhyoid being the most frequent, followed by suprahyoid and prehyoid). * **Option B (True):** Heterotopic thyroid tissue (normal thyroid follicles) is found in the wall of the cyst in about 20% of cases. This is a remnant of the descent of the thyroid gland from the foramen caecum. * **Option D (True):** The **Sistrunk Operation** is the gold standard treatment. It involves the excision of the cyst, the entire tract, and the **central portion of the hyoid bone** up to the foramen caecum to minimize the risk of recurrence (recurrence rate drops from ~50% to <5%). **Clinical Pearls for NEET-PG:** * **Embryology:** Arises from a persistent thyroglossal duct (remnant of the descent of the thyroid diverticulum). * **Clinical Sign:** It is a midline swelling that **moves upwards on protrusion of the tongue** (due to its attachment to the hyoid bone and foramen caecum). * **Differential Diagnosis:** Sublingual dermoid (does not move with tongue protrusion) and ectopic thyroid (ensure a normal thyroid gland is present before excision). * **Investigation of Choice:** Ultrasound is the initial investigation to confirm the cyst and verify the presence of a normal thyroid gland in the neck.

Q: Weber Ferguson incision is used for the surgical management of which cancer?

Hard palate cancer. **Explanation:** The **Weber-Ferguson incision** is the standard surgical approach used for **Maxillectomy**. It provides excellent exposure to the midface, including the maxilla, paranasal sinuses, and the **hard palate**. **Why the Correct Answer is Right:** Cancer of the hard palate often requires a partial or total maxillectomy to achieve clear oncological margins. The Weber-Ferguson incision involves an infraorbital component and a midline lip-split (cheilotomy), allowing the surgeon to reflect a large cheek flap. This provides the necessary visualization to resect the bony structures of the upper jaw and palate. **Why the Incorrect Options are Wrong:** * **Breast cancer:** Surgical management typically involves a periareolar, elliptical (Stewart), or transverse (Orr) incision for mastectomy. * **Thyroid cancer:** The standard approach is the **Kocher’s transverse collar incision**, made approximately 2 cm above the sternal notch. * **Cancer of the penis:** Surgical management (Partial or Total Penectomy) involves circular or elliptical incisions around the base of the shaft or the lesion; it does not involve facial incisions. **High-Yield Clinical Pearls for NEET-PG:** * **Dieffenbach Extension:** An extension of the Weber-Ferguson incision towards the temple to provide better access to the zygomatic bone. * **Lynch Extension:** An extension towards the medial canthus/bridge of the nose for access to the ethmoid sinuses. * **Complication:** A common post-operative concern with this incision is ectropion (eversion of the lower eyelid) or persistent facial edema. * **Alternative:** For smaller palatal lesions, an intra-oral approach may be used, but for malignant tumors, Weber-Ferguson remains the gold standard for exposure.

Q: All of the following are anatomical markers for the localization of the facial nerve during parotid surgery, except?

Inferior belly of omohyoid. **Explanation:** The localization of the facial nerve is the most critical step in parotidectomy to avoid iatrogenic injury. The facial nerve exits the skull via the **stylomastoid foramen** and enters the parotid gland, where it divides into its terminal branches. **Why Option C is the correct answer:** The **inferior belly of the omohyoid** is located in the lower part of the neck (posterior triangle), crossing the internal jugular vein. It is a landmark for level III and IV neck dissections but has no anatomical proximity to the parotid gland or the facial nerve trunk. **Evaluation of other options (Anatomical Landmarks):** * **Posterior belly of Digastric (Option A):** The facial nerve trunk lies just superior to the upper border of this muscle. It is a highly reliable landmark. * **Mastoid process (Option B):** The nerve exits the stylomastoid foramen, which is located medial to the mastoid process. Palpating the mastoid helps orient the surgeon to the depth of the nerve. * **Bony external auditory meatus (Option C):** The nerve is located approximately 1 cm deep and slightly anterior-inferior to the **"Tragal Pointer"** (the deep extension of the tragal cartilage). The tympanomastoid fissure, located between the mastoid and the bony meatus, leads directly to the stylomastoid foramen. **High-Yield Clinical Pearls for NEET-PG:** * **Tragal Pointer:** The most commonly used landmark; the nerve lies 1 cm deep and slightly anterior-inferior to it. * **Tympanomastoid Fissure:** Considered the most precise landmark; the nerve is found 6–8 mm deep to this fissure. * **Retrograde Identification:** If the main trunk cannot be found, surgeons identify a peripheral branch (e.g., buccal) and trace it back to the pes anserinus. * **Styloid Process:** The nerve lies lateral to the styloid process.

Q: What is the best radiographic view for visualizing the mandible?

Orthopantomogram. **Explanation:** The **Orthopantomogram (OPG)**, also known as a panoramic radiograph, is the gold standard and best initial screening tool for visualizing the mandible. **Why OPG is the Correct Answer:** The OPG provides a continuous, curved, two-dimensional panoramic view of the entire mandible, including the body, symphysis, angles, rami, and both condyles. It is particularly superior because it eliminates the superimposition of the cervical spine and the contralateral side of the jaw, which often obscures details in standard plain films. It allows for the assessment of multiple fracture sites (as mandible fractures are often multiple) and the relationship of teeth to the fracture line. **Analysis of Incorrect Options:** * **Anteroposterior (AP) View:** This view suffers from significant superimposition of the base of the skull and the cervical spine, making it difficult to visualize the mandibular body and symphysis clearly. * **Lateral View:** A true lateral view results in the overlap of the right and left halves of the mandible, rendering it nearly useless for diagnostic purposes unless taken as a "Lateral Oblique." * **Oblique View:** While the Lateral Oblique (Body or Ramus) view can help visualize specific segments, it does not provide a comprehensive view of the entire mandibular arch in a single film like the OPG. **Clinical Pearls for NEET-PG:** * **Gold Standard for Trauma:** While OPG is the best *radiographic* view, **NCCT (Non-Contrast CT) with 3D reconstruction** is the overall gold standard for complex maxillofacial trauma. * **Towne’s View:** Best for visualizing the **mandibular condyles** and the subcondylar region. * **Water’s View:** Best for visualizing the **maxilla, maxillary sinuses, and orbital floor**. * **Ring Bone Principle:** The mandible acts like a ring; if you see one fracture, always look for a second (often contralateral) fracture.

Q: A 36-year-old man developed neck and left arm pain. He noted paresthesias in the left index and long fingers. He was found to have weakness of the left triceps muscle and a diminished left triceps jerk. His left-sided disc herniation is most likely to be at what level?

C6-C7. **Explanation:** The clinical presentation describes a **C7 radiculopathy**, which is most commonly caused by a posterolateral disc herniation at the **C6-C7 level**. In the cervical spine, the nerve root exits *above* the pedicle of the corresponding vertebra (e.g., the C7 nerve root exits through the C6-C7 intervertebral foramen). **Why C6-C7 is correct:** The C7 nerve root is responsible for: * **Motor:** Extension of the elbow (Triceps muscle) and wrist flexion. * **Reflex:** The Triceps jerk. * **Sensory:** Sensation to the middle finger (long finger) and often the index finger. The patient’s symptoms—triceps weakness, diminished triceps reflex, and paresthesia in the index/long fingers—perfectly align with C7 involvement. **Why other options are incorrect:** * **C3-C4 (C4 root):** Results in sensory loss at the base of the neck and top of the shoulder; no major limb muscle weakness or reflex changes. * **C4-C5 (C5 root):** Causes weakness in the Deltoid and Biceps, sensory loss over the lateral arm, and a diminished Biceps reflex. * **C5-C6 (C6 root):** Causes weakness in the Biceps and Brachioradialis (wrist extensors), sensory loss in the thumb and radial side of the forearm, and a diminished Brachioradialis reflex. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Level:** C6-C7 (C7 root) is the most frequent site of cervical disc herniation, followed by C5-C6 (C6 root). * **The "Rule of Fingers":** * C6 = Thumb ("6" looks like a 'b' for Biceps/Brachioradialis). * C7 = Middle finger (The "7" looks like a pointing finger). * C8 = Ring and Little fingers. * **Spurling’s Test:** A high-yield physical exam maneuver where neck extension and lateral rotation toward the affected side reproduce radicular pain.

Q: Premature filling of veins is a manifestation in cerebral angiography of which condition?

Arteriovenous malformation. ### Explanation **Correct Answer: C. Arteriovenous malformation (AVM)** **Underlying Concept:** In a normal physiological state, blood travels from arteries to capillaries and then to veins. This transition creates a "capillary delay," meaning veins visualize on an angiogram several seconds after the arterial phase. In an **Arteriovenous Malformation (AVM)**, there is a direct communication between arteries and veins through a "nidus," bypassing the high-resistance capillary bed. This **shunting** results in rapid, high-pressure blood flow directly into the venous system. Consequently, veins appear prematurely on angiography (often simultaneously with the arteries), which is a pathognomonic sign of AVM. **Analysis of Incorrect Options:** * **A. Trauma:** While trauma can cause vascular injuries like dissections or hematomas, it typically results in extravasation of contrast or vessel narrowing, not a systematic premature venous filling. * **B. Brain tumor:** Highly vascular tumors (like glioblastoma) may show increased vascularity or "tumor blush," but they do not typically demonstrate the rapid, direct arteriovenous shunting seen in AVMs. * **D. Arterial occlusion:** This leads to a **delay** or complete absence of contrast distal to the blockage, the exact opposite of premature filling. **NEET-PG High-Yield Pearls:** * **Gold Standard Investigation:** Digital Subtraction Angiography (DSA) is the gold standard for diagnosing and mapping AVMs. * **Classic Angiographic Triad for AVM:** 1. Dilated feeding arteries. 2. A "nidus" (tangle of vessels). 3. **Early draining veins** (Premature filling). * **Clinical Presentation:** The most common presentations are intracranial hemorrhage (ICH) or new-onset seizures in a young adult. * **Spetzler-Martin Grade:** Used to assess the surgical risk of AVMs based on size, eloquence of adjacent brain tissue, and venous drainage pattern.

Question 1

Which structure is preserved during modified radical neck dissection?

Accepted Answer

Sternocleidomastoid muscle

Answer

Phrenic nerve

Answer

Submandibular gland

Answer

Thoracic duct

Question 2

Which of the following statements regarding thyroglossal cysts is not true?

Accepted Answer

Rarely can contain foci of follicular carcinoma

Answer

80% are found in juxtaposition to the hyoid bone

Answer

Heterotopic thyroid tissue is present in 20% of cases

Answer

The treatment of choice is Sistrunk operation

Question 3

Weber Ferguson incision is used for the surgical management of which cancer?

Accepted Answer

Hard palate cancer

Answer

Breast cancer

Answer

Thyroid cancer

Answer

Cancer of the penis

Question 4

All of the following are anatomical markers for the localization of the facial nerve during parotid surgery, except?

Accepted Answer

Inferior belly of omohyoid

Answer

Posterior belly of Digastric

Answer

Mastoid process

Answer

Bony external auditory meatus

Question 5

What is a potential complication of a biopsy taken for scalene lymph nodes?

Accepted Answer

Injury to the apex of the lung

Answer

Injury to the phrenic nerve

Answer

Injury to the vagus nerve

Answer

Injury to the trachea

Question 6

What is the best radiographic view for visualizing the mandible?

Accepted Answer

Orthopantomogram

Answer

Anteroposterior view

Answer

Lateral view

Answer

Oblique view

Question 7

A 36-year-old man developed neck and left arm pain. He noted paresthesias in the left index and long fingers. He was found to have weakness of the left triceps muscle and a diminished left triceps jerk. His left-sided disc herniation is most likely to be at what level?

Accepted Answer

C6-C7

Answer

C3-C4

Answer

C4-C5

Answer

C5-C6

Question 8

A 40-year-old female presented with a progressively increasing lump in the parotid region. On oral examination, the tonsil was pushed medially. Biopsy showed it to be pleomorphic adenoma. What is the appropriate treatment?

Accepted Answer

Conservative total parotidectomy

Answer

Superficial parotidectomy

Answer

Lumpectomy

Answer

Enucleation

Question 9

Premature filling of veins is a manifestation in cerebral angiography of which condition?

Accepted Answer

Arteriovenous malformation

Answer

Trauma

Answer

Brain tumor

Answer

Arterial occlusion

Question 10

A secretory sinus in the neck moves upon deglutition. What is the most likely diagnosis?

Accepted Answer

Thyroglossal fistula

Answer

Branchial sinus

Answer

Pilonidal cyst

Answer

Sublingual dermoid cyst

Head and Neck Surgery — MCQs

Head and Neck Surgery — MCQs

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