Head and Neck Surgery Practice Questions

Q: Lower lip paralysis after a parotidectomy is most likely due to injury to which structure?

Marginal mandibular branch of the facial nerve. ***Marginal mandibular branch of the facial nerve*** - The **marginal mandibular branch** innervates the muscles of the lower lip and chin, including the **depressor anguli oris**, **depressor labii inferioris**, and **mentalis**. - Injury to this nerve during a **parotidectomy**, where it can be inadvertently cut or damaged due to its superficial course over the mandible, results in ipsilateral **lower lip paralysis** and an asymmetric smile. *Buccal branch of the facial nerve* - The **buccal branch** primarily innervates the muscles around the mouth, such as the buccinator and orbicularis oris, affecting **upper lip movement** and cheek function. - Damage to this branch would typically affect functions like chewing and smiling, but not specifically the lower lip. *Cervical branch of the facial nerve* - The **cervical branch** innervates the **platysma muscle**, which is involved in neck skin tension and depressing the mandible. - Injury to this branch would cause weakness or paralysis of the platysma, not lower lip paralysis. *Temporal branch of the facial nerve* - The **temporal branch** innervates the muscles of the forehead and around the eye, including the **frontalis** and **orbicularis oculi**. - Damage to this branch would result in the inability to wrinkle the forehead and close the eye, but not lower lip paralysis.

Q: A 55-year-old male patient presents to the clinic with left lower lip weakness following a recent parotid gland surgery. Considering the surgical history and current symptoms, what is the most likely site of the lesion causing this patient's condition?

Marginal mandibular branch of the facial nerve. ***Marginal mandibular branch of the facial nerve*** - This branch supplies the muscles around the lower lip, including the **depressor anguli oris** and **depressor labii inferioris**, which are responsible for lower lip movement. - Damage to this specific branch during **parotid gland surgery** is a common cause of isolated **lower lip weakness**, as it runs superficial to the submandibular gland and is vulnerable during dissections in this area. *Main trunk of facial nerve* - Injury to the main trunk would result in **widespread paralysis** of all facial muscles on the affected side, not just isolated lower lip weakness. - The main trunk emerges from the stylomastoid foramen and then enters the parotid gland before branching, so damage here would affect all subsequent branches. *Temporal branch of facial nerve* - This branch innervates muscles responsible for eyebrow movement and forehead wrinkling (e.g., **frontalis muscle**). - Damage to the temporal branch would cause inability to raise the eyebrow and smooth out the forehead, not lower lip weakness. *Parotid duct* - The parotid duct (Stensen's duct) is responsible for transporting saliva from the parotid gland to the oral cavity. - Injury to the parotid duct would lead to complications like **salivary fistula** or **sialocele**, but it does not carry motor innervation to facial muscles and would not cause weakness.

Q: A 55-year-old male presents with a painless neck mass and a history of chronic tobacco use. Fine needle aspiration cytology reveals squamous cell carcinoma. What is the most likely primary site of the carcinoma?

Larynx. ***Larynx*** - **Squamous cell carcinoma** (SCC) of the larynx frequently presents as a painless neck mass due to nodal metastasis, and **chronic tobacco use** is a major risk factor. - The larynx is a common primary site for SCC in individuals with a significant smoking history, often detected as a neck mass representing a **metastatic lymph node**. *Thyroid gland* - Thyroid masses are typically identified as discrete thyroid nodules, and while they can be SCC, it's far less common as a primary than other head and neck sites with a history of tobacco use. - **Papillary** and **follicular carcinomas** are more common thyroid malignancies, and smoking is not a primary risk factor for these. *Salivary gland* - Salivary gland tumors are often primary **adenocarcinomas** or **mucoepidermoid carcinomas**, not typically SCC in the absence of pre-existing squamous metaplasia. - While salivary gland masses can occur in the neck region, SCC as a primary here is relatively rare compared to other head and neck sites linked to tobacco. *Nasopharynx* - **Nasopharyngeal carcinoma** is typically associated with **Epstein-Barr virus (EBV) infection** and has a higher prevalence in certain endemic regions (e.g., Southeast Asia), not primarily linked to tobacco use in the same way as laryngeal SCC. - Nasopharyngeal masses can cause symptoms like **nasal obstruction**, **epistaxis**, and **hearing loss** due to eustachian tube dysfunction, which are not mentioned here.

Q: A patient presents with a rapidly growing neck mass and difficulty breathing. What is the initial management for this patient?

Immediate airway management. Immediate airway management [1], [2] - A rapidly growing neck mass causing difficulty breathing indicates potential airway obstruction, which is a life-threatening emergency. [1], [2] - Securing the airway with measures like intubation or tracheostomy takes precedence over diagnostic procedures. [1], [2] Biopsy - While a biopsy is crucial for diagnosing the nature of a neck mass, it is a diagnostic procedure that can be delayed until the patient's airway is stable. - Performing a biopsy on an unstable patient with airway compromise can worsen their condition due to potential bleeding or swelling. CT scan - A CT scan is a valuable imaging modality for characterizing a neck mass and assessing its extent, but like biopsy, it is a diagnostic tool. - Delaying airway management for a CT scan in a patient with respiratory distress can lead to respiratory arrest. Observation - Observation is inappropriate when a patient presents with a rapidly growing neck mass causing difficulty breathing, as the situation is acute and requires immediate intervention. - Waiting for the condition to resolve spontaneously or worsen can have fatal consequences.

Q: A 50-year-old male presents with progressive hoarseness and difficulty swallowing following thyroid surgery. Laryngoscopy reveals bilateral vocal cord paralysis. What is the most likely cause?

Thyroid surgery. ***Thyroid surgery*** - **Bilateral vocal cord paralysis** is a severe complication of **thyroid surgery**, typically due to injury to the **recurrent laryngeal nerves**. - This nerve damage can lead to both **hoarseness** (aphonia or dysphonia) and **difficulty swallowing** (dysphagia) due to impaired vocal cord movement. *Laryngeal carcinoma* - While it can cause hoarseness and dysphagia, a carcinoma typically presents as a **mass lesion** on laryngoscopy and often causes **unilateral paralysis** initially. - **Bilateral vocal cord paralysis** due to carcinoma is less common without significant tumor burden visible, and the question does not mention any mass. *Vocal cord nodules* - **Vocal cord nodules** primarily cause hoarseness and are typically visible as **small, paired lesions** on the vocal cords, often associated with voice misuse. - They do not cause **vocal cord paralysis** or significant difficulty swallowing, as vocal cord movement is preserved. *Laryngitis* - **Laryngitis** causes hoarseness or loss of voice due to **inflammation** and swelling of the vocal cords. - It does not cause **vocal cord paralysis** or difficulty swallowing, and laryngoscopy would show diffuse inflammation rather than immobility.

Q: A 45-year-old man presents with a painless neck mass and hoarseness. On examination, there is a firm, fixed mass in the left anterior triangle of the neck. Which investigation is most appropriate to establish the diagnosis?

Fine-needle aspiration biopsy. ***Fine-needle aspiration biopsy*** - A **fine-needle aspiration biopsy (FNAB)** is the most appropriate investigation to **establish the cytological diagnosis** of a solid neck mass. It helps differentiate between benign and malignant conditions. - It is a **minimally invasive procedure** that can be performed in the office, offering a quick and relatively inexpensive way to obtain tissue for examination. - **Clinical note:** In a patient with hoarseness and a neck mass, **laryngoscopy should also be performed** to evaluate for a primary laryngeal/hypopharyngeal lesion, as hoarseness suggests vocal cord involvement. *CT scan of the neck* - A CT scan is excellent for evaluating the **extent of a lesion**, its relationship to surrounding structures, and for **staging confirmed malignancies**. - However, it does not provide a **definitive histological or cytological diagnosis** and should follow tissue diagnosis or be used in conjunction with it. - CT is valuable for assessing the **deep extent of invasion** and involvement of vascular structures. *MRI of the neck* - MRI offers superior **soft tissue contrast** compared to CT and is particularly useful for assessing **nerve involvement, perineural spread**, or evaluating the extent of soft tissue invasion. - Like CT, it provides detailed imaging but does not establish a **tissue diagnosis**, which is crucial for determining the nature of the mass. *Ultrasound of the neck* - Ultrasound is useful for determining if a neck mass is **solid or cystic** and for **guiding fine-needle aspiration biopsy**. - It can characterize the mass and assess cervical lymph nodes, but cannot provide a **definitive cytological diagnosis** without a biopsy. - It is operator-dependent and less useful for deep-seated masses.

Q: A patient presents with chronic sinusitis that is unresponsive to medical therapy. A CT scan reveals mucosal thickening and obstruction at the osteomeatal complex. What is the next best step in management?

Functional endoscopic sinus surgery. ***Functional endoscopic sinus surgery*** - When **chronic sinusitis** is unresponsive to maximal medical therapy and a CT scan reveals significant mucosal thickening and **osteomeatal complex obstruction**, **FESS** is the next best step. - This procedure aims to restore ventilation and drainage of the sinuses by removing diseased tissue and widening ostia, addressing the anatomical obstruction. *Continued medical therapy* - The question states the patient's **chronic sinusitis is unresponsive to medical therapy**, indicating that further continuation without other interventions would likely be ineffective. - While medical therapy is the initial approach, persistence with it alone after failure requires considering surgical options. *Maxillary sinus irrigation* - This procedure provides temporary relief by flushing out mucus but does not address the underlying anatomical **obstruction at the osteomeatal complex**, which is likely causing recurrent sinusitis. - It is generally considered less effective as a definitive treatment for chronic, obstructive sinusitis compared to surgical correction. *Referral for allergy testing* - While allergies can contribute to chronic rhinitis and sinusitis, this patient has clearly defined anatomical obstruction and mucosal changes visible on CT, indicating a need for intervention beyond allergy management. - Allergy testing would be appropriate as part of a comprehensive workup but is not the **"next best step"** when surgical intervention for a structural problem is indicated.

Q: A 55-year-old female presents with a rapidly enlarging neck mass and stridor. Fine needle aspiration is inconclusive. What is the most appropriate next step?

Surgical excision biopsy. ***Surgical excision biopsy*** - A rapidly enlarging neck mass with **stridor** suggests an aggressive malignancy, and an **inconclusive FNA** necessitates a definitive tissue diagnosis. - An excisional biopsy provides the most comprehensive tissue sample for **histopathological analysis**, allowing for accurate staging and treatment planning. *Repeat fine needle aspiration* - Given the aggressive nature of the mass (rapid enlargement, stridor) and the previous **inconclusive FNA**, repeating the FNA is unlikely to yield a definitive diagnosis quickly enough. - The risk of **sampling error** remains, and delaying a definitive diagnosis could compromise patient outcomes. *Thyroid scan* - A thyroid scan assesses the functional status of thyroid nodules (hot vs. cold) but does not provide a definitive **histopathological diagnosis** for malignancy. - It is primarily used to evaluate **hyperthyroidism** or distinguish between different causes of thyroid nodules, not for rapidly growing, potentially malignant masses. *CT scan of the neck* - A CT scan can provide detailed anatomical information about the mass, its size, local invasion, and involvement of adjacent structures, which is useful for surgical planning. - However, it does not provide a **tissue diagnosis**, which is critical for determining the nature of the rapidly growing mass and guiding treatment.

Q: A 50-year-old female presents with a mass in the floor of the mouth. On examination, the mass is firm, non-tender, and there is no cervical lymphadenopathy. What is the most likely diagnosis?

Benign salivary gland tumor. ***Benign salivary gland tumor*** - A **firm, non-tender mass** in the floor of the mouth, without associated lymphadenopathy or systemic symptoms, is characteristic of a benign salivary gland tumor, such as a pleomorphic adenoma. - These tumors grow slowly and typically do not cause pain or inflammation unless they become very large or undergo malignant transformation. *Sialolithiasis* - This condition involves the formation of **stones in salivary ducts**, leading to pain and swelling, especially during eating. - It would typically present with **intermittent pain and swelling** related to meals, which is not mentioned in the presentation of a firm, non-tender mass. *Squamous cell carcinoma* - While possible in the oral cavity, **oral squamous cell carcinoma** often presents with ulceration, rapid growth, pain, and/or associated cervical lymphadenopathy. - The absence of these features (non-tender, no lymphadenopathy) makes it less likely, although biopsy is still crucial for definitive diagnosis. *Lymphoma* - Oral lymphoma can manifest as a mass, but it is often associated with **systemic symptoms** like fever, night sweats, and weight loss, or more diffuse swelling. - Lymphoma in the oral cavity is less common than salivary gland tumors and typically presents with a different clinical picture, often involving the palate or tonsils.

Question 1

A patient presents with facial nerve palsy and vertigo after mastoid surgery. The most likely site of injury is:

Accepted Answer

Vertical segment

Answer

Geniculate ganglion

Answer

Tympanic segment

Answer

Labyrinthine segment

Question 2

Lower lip paralysis after a parotidectomy is most likely due to injury to which structure?

Accepted Answer

Marginal mandibular branch of the facial nerve

Answer

Buccal branch of the facial nerve

Answer

Cervical branch of the facial nerve

Answer

Temporal branch of the facial nerve

Question 3

A 55-year-old male patient presents to the clinic with left lower lip weakness following a recent parotid gland surgery. Considering the surgical history and current symptoms, what is the most likely site of the lesion causing this patient's condition?

Accepted Answer

Marginal mandibular branch of the facial nerve

Answer

Main trunk of facial nerve

Answer

Temporal branch of facial nerve

Answer

Parotid duct

Question 4

A 55-year-old male presents with a painless neck mass and a history of chronic tobacco use. Fine needle aspiration cytology reveals squamous cell carcinoma. What is the most likely primary site of the carcinoma?

Accepted Answer

Larynx

Answer

Thyroid gland

Answer

Salivary gland

Answer

Nasopharynx

Question 5

A patient presents with a rapidly growing neck mass and difficulty breathing. What is the initial management for this patient?

Accepted Answer

Immediate airway management

Answer

Biopsy

Answer

CT scan

Answer

Observation

Question 6

A 50-year-old male presents with progressive hoarseness and difficulty swallowing following thyroid surgery. Laryngoscopy reveals bilateral vocal cord paralysis. What is the most likely cause?

Accepted Answer

Thyroid surgery

Answer

Laryngeal carcinoma

Answer

Vocal cord nodules

Answer

Laryngitis

Question 7

A 45-year-old man presents with a painless neck mass and hoarseness. On examination, there is a firm, fixed mass in the left anterior triangle of the neck. Which investigation is most appropriate to establish the diagnosis?

Accepted Answer

Fine-needle aspiration biopsy

Answer

CT scan of the neck

Answer

MRI of the neck

Answer

Ultrasound of the neck

Question 8

A patient presents with chronic sinusitis that is unresponsive to medical therapy. A CT scan reveals mucosal thickening and obstruction at the osteomeatal complex. What is the next best step in management?

Accepted Answer

Functional endoscopic sinus surgery

Answer

Continued medical therapy

Answer

Maxillary sinus irrigation

Answer

Referral for allergy testing

Question 9

A 55-year-old female presents with a rapidly enlarging neck mass and stridor. Fine needle aspiration is inconclusive. What is the most appropriate next step?

Accepted Answer

Surgical excision biopsy

Answer

Repeat fine needle aspiration

Answer

Thyroid scan

Answer

CT scan of the neck

Question 10

A 50-year-old female presents with a mass in the floor of the mouth. On examination, the mass is firm, non-tender, and there is no cervical lymphadenopathy. What is the most likely diagnosis?

Accepted Answer

Benign salivary gland tumor

Answer

Sialolithiasis

Answer

Squamous cell carcinoma

Answer

Lymphoma

Head and Neck Surgery — MCQs

Head and Neck Surgery — MCQs

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