Head and Neck Surgery Practice Questions

Q: Which surgical landmarks are used for locating the facial nerve?

All of the options. ***All of the options*** - The **tympano-mastoid suture**, the **tragal pointer**, and the **posterior belly of the digastric** muscle are all commonly used surgical landmarks for identifying and preserving the facial nerve during parotidectomy or other procedures in the vicinity. - Using multiple landmarks provides a more reliable and precise localization of the facial nerve, reducing the risk of iatrogenic injury. *Tympano - mastoid suture* - This suture line is an important external landmark that helps guide the dissection towards the **stylomastoid foramen**, where the facial nerve exits the skull. - The facial nerve typically lies deep and anterior to this suture, providing a valuable starting point for identification. *Tragal pointer* - The **tragal pointer** (cartilaginous projection of the tragus) points directly towards the main trunk of the facial nerve as it enters the parotid gland. - It is a highly reliable superficial landmark, particularly useful in locating the superior aspect of the facial nerve trunk. *Posterior belly of digastric* - The **posterior belly of the digastric muscle** serves as a deep landmark, as the facial nerve typically courses immediately superior and lateral to it. - Dissection along the superior border of this muscle can lead directly to the facial nerve trunk, especially when dissecting inferiorly.

Q: A 23-year-old male patient presents with midline swelling in the neck. The swelling moves with deglutition and protrusion of the tongue. What is the likely diagnosis?

Thyroglossal cyst. ***Thyroglossal cyst*** - A **thyroglossal cyst** is a congenital anomaly that arises from the persistent **thyroglossal duct**, a remnant of the thyroid's embryologic descent. - Its classic diagnostic feature is its movement with **deglutition** (due to attachment to the hyoid bone, which moves during swallowing) and **protrusion of the tongue** (as the thyroglossal duct is connected to the base of the tongue). *Brachial cyst* - A **brachial cyst** is a congenital neck mass that typically presents as a lateral neck swelling, often located along the anterior border of the **sternocleidomastoid muscle**. - Unlike a thyroglossal cyst, it does not typically move with **deglutition** or **tongue protrusion**. *Plunging ranula* - A **plunging ranula** is a type of mucocele that arises from the **sublingual gland** and extends below the mylohyoid muscle into the neck. - It presents as a cervical mass but is typically located in the floor of the mouth or submandibular region and does not move with **deglutition** or **tongue protrusion**. *Dermoid cyst* - A **dermoid cyst** is a congenital cyst that can occur anywhere on the body, including the head and neck, often presenting as a painless mass. - It arises from sequestered embryonic ectoderm and mesoderm, containing skin appendages, but it does not move with **deglutition** or **tongue protrusion**.

Q: The most common site of the branchial cyst is:

Anterior border of sternocleidomastoid. ***Anterior border of sternocleidomastoid*** - Branchial cysts most commonly present as a mass along the **anterior border of the sternocleidomastoid muscle**, typically in the upper to middle third of the neck [3]. - This location corresponds to the embryological remnants of the **second branchial cleft**. *Posterior border of sternocleidomastoid* - Cysts or masses in this region are less likely to be branchial cysts and might indicate other conditions like **lymphadenopathy** or a **cystic hygroma** [1]. - The posterior border is not the typical embryological location for branchial cleft remnants to form cysts. *Digastric muscle* - While the digastric muscle is located in the neck, cysts directly associated with this muscle are rare and usually of **different embryological origin** (e.g., salivary gland cysts or submandibular space infections). - Branchial cysts are specifically tied to the branchial apparatus remnants. *Omohyoid muscle* - The omohyoid muscle crosses the lower neck, and masses in its vicinity are typically not branchial cysts but could involve **thyroid pathology**, **lymph nodes**, or **vascular anomalies** [2]. - This location is anatomically distinct from the typical presentation of a branchial cleft cyst.

Q: A middle-aged man presents with a swelling in the neck that has been present since childhood. The swelling has a bag or worm-like appearance and features a central black spot. Based on this description, what is the most likely diagnosis?

Plexiform neurofibroma. ***Plexiform neurofibroma*** - The description of a swelling since childhood with a **bag-of-worms appearance** and a **central black spot** is highly characteristic of a plexiform neurofibroma, a benign tumor of peripheral nerves. - These lesions are often associated with **neurofibromatosis type 1 (NF1)** and can grow quite large, causing cosmetic and functional concerns. - The **central black spot** represents pigmentation often seen in neurofibromas, particularly in NF1. *Cirsoid aneurysm* - A cirsoid aneurysm is a **congenital arteriovenous malformation** characterized by a tortuous mass of dilated blood vessels. - While it can manifest as a swelling, it typically presents with a **palpable thrill and audible bruit**, and its appearance is not usually described as having a central black spot. *Varicocele* - A varicocele is an **abnormal enlargement of the pampiniform plexus veins** in the scrotum, often described as a **bag of worms**, but it occurs exclusively in the scrotum. - It would not be found in the neck and does not feature a central black spot. *Lymphangioma* - A lymphangioma is a **benign malformation of the lymphatic system** that can present as a soft, compressible mass, often in the neck. - While present since childhood, its appearance is typically **cystic or multicystic** and does not usually have the distinct bag-of-worms texture or a central black spot described.

Q: What is the most common cause of a parotid mass that presents with mixed consistency?

Pleomorphic adenoma. ***Pleomorphic adenoma*** - The presence of a **mixed consistency** parotid mass, often noted as a **firm yet compressible** lump, is characteristic of pleomorphic adenoma. - This tumor's **benign nature** allows for gradual growth and is the most common parotid gland tumor, often being mobile and well-defined on examination [1]. *All* - The term "all" is too vague and does not specify a particular pathology or characteristics relevant to a **mixed consistency** mass. - It does not represent any known entity, making it an unsuitable answer in the context of **specific diagnosis**. *Sebaceous cyst* - Sebaceous cysts are typically **smooth, soft, and fluctuant**, lacking the mixed consistency seen in pleomorphic adenomas. - They are also usually associated with **skin** and hair follicles, not commonly arising in the parotid gland region. *Dermoid cyst* - Dermoid cysts usually present as **soft, cystic lesions** filled with **keratin**, which does not align with the mixed consistency nature of pleomorphic adenomas. - They can occur in various locations but are not the typical presentation for a parotid mass. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 751-753.

Q: Supraomohyoid dissection is a type of?

Selective neck dissection. ***Selective neck dissection*** - **Supraomohyoid dissection** specifically refers to a type of selective neck dissection, characterized by the removal of lymph node levels **I, II, and III**. - This procedure is commonly performed for early-stage oral cavity cancers due to their typical lymphatic spread patterns. *Modified radical neck dissection* - This dissection preserves one or more **non-lymphatic structures** (e.g., sternocleidomastoid muscle, internal jugular vein, spinal accessory nerve) that are typically removed in a radical neck dissection. - It involves a broader range of lymph node levels (typically **I-V**) compared to a supraomohyoid dissection. *Radical neck dissection* - This is a more extensive procedure involving the removal of all lymph node groups (levels **I-V**), along with the **sternocleidomastoid muscle**, **internal jugular vein**, and **spinal accessory nerve**. - It is reserved for advanced neck disease due to its significant morbidity. *Posterolateral dissection* - **Posterolateral neck dissection** is a term not commonly used within the standard classification of neck dissections (radical, modified radical, selective). - Lymphatic dissection is typically categorized based on anatomical levels rather than a general directional term like posterolateral.

Q: Which of the following neck dissections is considered the most conservative?

Supraomohyoid neck dissection. ***Supraomohyoid neck dissection*** - This dissection is highly **selective**, removing only lymph nodes from **levels I, II, and III**, which are the most superficial and anterior groups in the neck. - It preserves the **internal jugular vein**, spinal accessory nerve, and sternocleidomastoid muscle, minimizing functional and cosmetic morbidity. *Radical neck dissection* - This is the **most extensive** neck dissection, involving the removal of all lymph node levels (I-V), the **internal jugular vein**, the **spinal accessory nerve**, and the **sternocleidomastoid muscle**. - It is reserved for advanced cancers with extensive nodal involvement due to its significant associated morbidity and functional deficits. *Modified radical neck dissection* - This dissection removes lymph nodes in levels I-V but **spares at least one non-lymphatic structure**, such as the spinal accessory nerve, internal jugular vein, or sternocleidomastoid muscle. - While less radical than a full radical neck dissection, it is still more extensive than a supraomohyoid dissection as it targets a broader range of lymph node levels. *All options are conservative.* - This statement is incorrect because **radical neck dissection** is by definition the most extensive and least conservative surgical approach to neck nodal disease. - The different types of neck dissections represent a spectrum of extensiveness, with supraomohyoid being the most selective and conservative.

Q: Which of the following stages of lip carcinoma does not have nodal involvement?

T3N0. ***T3N0*** - The **'N' classification** in the TNM staging system refers to **nodal involvement**. A stage with **'N0' indicates no regional lymph node metastasis**. - A **T3 lesion** signifies a large primary tumor, but if it's accompanied by **N0**, it means there's no evidence of spread to the lymph nodes. *T2N1* - The **'N1' classification** indicates the presence of **regional lymph node metastasis**, specifically in a **single ipsilateral lymph node** that is 3 cm or less in its greatest dimension. - This stage therefore **does have nodal involvement**, contradicting the premise of the question. *T2N2* - The **'N2' classification** signifies more advanced regional lymph node metastasis, such as a **single ipsilateral lymph node** greater than 3 cm but not more than 6 cm. - It could also refer to **multiple ipsilateral lymph nodes**, none greater than 6 cm, or bilateral/contralateral lymph nodes, none greater than 6 cm. In all these cases, **nodal involvement is present**. *T1N1* - Similar to T2N1, the **'N1' component** in T1N1 indicates the presence of **regional lymph node metastasis** in a single ipsilateral lymph node of 3 cm or less. - Therefore, this stage **does involve nodal spread**, despite having a smaller primary tumor (T1).

Q: Most common site for Cystic Hygroma is -

Lower third of neck. ***Lower third of neck*** - **Cystic hygromas** (also known as **lymphatic malformations**) most commonly occur in the **posterior triangle of the neck**, which is located in the lower lateral aspect of the neck [1]. - Approximately **75-80%** of cystic hygromas are found in the neck region, with the **posterior triangle** being the predominant site. - The **posterior jugular lymph sac** fails to connect properly with the venous system during embryonic development, leading to these cystic malformations in this characteristic location [1]. - The posterior triangle encompasses the lower lateral neck, making "lower third of neck" an acceptable description of this most common site. *Overlying the parotid gland* - While lymphatic malformations can occur in the parotid region, this represents only about **10-15%** of cases. - This is a less common site compared to the posterior triangle of the neck. - Lesions in this area might raise concern for other parotid pathologies like **pleomorphic adenoma** or **hemangioma**. *Along the Zygomatic Prominence* - This is an unusual location for a cystic hygroma, as the lymphatic drainage and embryonic development in this area are not typically associated with these malformations. - Lesions here might suggest different developmental or neoplastic etiologies such as **dermoid cysts** or **vascular malformations**. *Post auricular* - The post-auricular region is not a common site for cystic hygromas. - Swelling in this area could be due to other conditions like **mastoiditis**, **lymphadenopathy**, or **sebaceous cysts**.

Q: Which of the following statements about Branchial cysts is true:

Most common site is lateral neck. ***Most common site is lateral neck*** - **Branchial cleft cysts** typically present as a mass in the **lateral neck**, anterior to the sternocleidomastoid muscle. - They are congenital anomalies resulting from incomplete obliteration of the branchial clefts during embryonic development. *50-70% are seen in lungs* - This statement is incorrect; branchial cysts are **cervical anomalous masses** arising from the branchial apparatus, not primarily found in the lungs. - Lung lesions are more commonly associated with congenital pulmonary airway malformations or bronchogenic cysts, which differ in origin. *They are premalignant lesions* - Branchial cysts are generally **benign lesions** and do not typically transform into malignancy. - While rare cases of carcinoma arising within a branchial cleft cyst have been reported, they are not considered routinely premalignant. *Infection is uncommon in branchial cysts* - Conversely, infection is a **common complication** of branchial cysts, often leading to sudden enlargement, pain, and erythema. - The presence of internal fluid and epithelial lining makes them susceptible to bacterial colonization and subsequent abscess formation.

Question 1

Which surgical landmarks are used for locating the facial nerve?

Accepted Answer

All of the options

Answer

Tympano - mastoid suture

Answer

Tragal pointer

Answer

Posterior belly of digastric

Question 2

A 23-year-old male patient presents with midline swelling in the neck. The swelling moves with deglutition and protrusion of the tongue. What is the likely diagnosis?

Accepted Answer

Thyroglossal cyst

Answer

Brachial cyst

Answer

Plunging ranula

Answer

Dermoid cyst

Question 3

The most common site of the branchial cyst is:

Accepted Answer

Anterior border of sternocleidomastoid

Answer

Posterior border of sternocleidomastoid

Answer

Digastric muscle

Answer

Omohyoid muscle

Question 4

A middle-aged man presents with a swelling in the neck that has been present since childhood. The swelling has a bag or worm-like appearance and features a central black spot. Based on this description, what is the most likely diagnosis?

Accepted Answer

Plexiform neurofibroma

Answer

Cirsoid aneurysm

Answer

Varicocele

Answer

Lymphangioma

Question 5

What is the most common cause of a parotid mass that presents with mixed consistency?

Accepted Answer

Pleomorphic adenoma

Answer

Sebaceous cyst

Answer

Dermoid cyst

Answer

Warthin tumor

Question 6

Supraomohyoid dissection is a type of?

Accepted Answer

Selective neck dissection

Answer

Modified radical neck dissection

Answer

Radical neck dissection

Answer

Posterolateral dissection

Question 7

Which of the following neck dissections is considered the most conservative?

Accepted Answer

Supraomohyoid neck dissection

Answer

Radical neck dissection

Answer

Modified radical neck dissection

Answer

All options are conservative.

Question 8

Which of the following stages of lip carcinoma does not have nodal involvement?

Accepted Answer

T3N0

Answer

T2N1

Answer

T2N2

Answer

T1N1

Question 9

Most common site for Cystic Hygroma is -

Accepted Answer

Lower third of neck

Answer

Overlying the parotid gland

Answer

Along the Zygomatic Prominence

Answer

Post auricular

Question 10

Which of the following statements about Branchial cysts is true:

Accepted Answer

Most common site is lateral neck

Answer

50-70% are seen in lungs

Answer

They are premalignant lesions

Answer

Infection is uncommon in branchial cysts

Head and Neck Surgery — MCQs

Head and Neck Surgery — MCQs

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