Staging of Head and Neck Cancer — MCQs
Which type of cancer is most commonly associated with perineural invasion in the head and neck region?
A 35-year-old female presents with a 5-cm tumor of the oral cavity and a single lymph node of 2 cm in diameter on the same side in the neck, and is staged as:
Which of the following stages of Breast Cancer corresponds to the following features: a breast mass of 6 x 3 cm, ipsilateral supraclavicular lymph node involvement, and distant metastasis that cannot be assessed?
N3a TNM staging of head and neck tumors (AJCC 8th edition) shows:
What finding during surgery can change the staging of a tumor from Stage I to Stage II in a patient with a history of lung cancer?
Which of the following stages of lip carcinoma does not have nodal involvement?
Which of the following is not considered a contraindication for pancreaticoduodenectomy?
Which of the following is NOT a component of Trotter's triad associated with nasopharyngeal carcinoma?
Which of the following is not a cause of oropharyngeal carcinoma?
Trismus in carcinoma of the temporal bone occurs due to involvement of:
Staging of Head and Neck Cancer Indian Medical PG Practice Questions and MCQs
Question 1: Which type of cancer is most commonly associated with perineural invasion in the head and neck region?
- A. Adenocarcinoma
- B. Adenoid cystic carcinoma (Correct Answer)
- C. Basal cell adenoma
- D. Squamous cell carcinoma
Explanation: ***Adenoid cystic carcinoma*** - Perineural invasion is a hallmark feature of **adenoid cystic carcinoma**, particularly in the **head and neck region** [1]. - This cancer tends to infiltrate along nerve sheaths, which can lead to **pain and neurological symptoms** due to local invasion. *Adenocarcinoma* - While adenocarcinoma can exhibit invasiveness, it is not specifically characterized by **perineural invasion** as a consistent feature. - These tumors usually arise from **glandular tissues** and do not have the same propensity for nerve invasion. *Basal cell adenoma* - Basal cell adenoma is generally a **benign tumor**, which does not exhibit aggressive features like perineural invasion. - Most frequently, they present as localized masses without significant invasion into surrounding structures. *Squamous cell carcinoma* - Although squamous cell carcinoma can be aggressive, **perineural invasion** is less commonly identified compared to other malignancies like adenoid cystic carcinoma. - It primarily involves **keratinizing epithelial cells** and tends to invade adjacent tissues rather than along nerve pathways. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 753-755.
Question 2: A 35-year-old female presents with a 5-cm tumor of the oral cavity and a single lymph node of 2 cm in diameter on the same side in the neck, and is staged as:
- A. T2 N1 M0
- B. T3 N1 M0 (Correct Answer)
- C. T2 N2 M0
- D. T1 N1 M0
Explanation: ***T3 N1 M0*** - A 5-cm tumor in the oral cavity is classified as **T3** because T3 refers to a tumor larger than 4 cm. - A single lymph node of 2 cm on the same side is classified as **N1**, which indicates a single ipsilateral lymph node ≤ 3 cm. *T2 N1 M0* - A **T2** tumor would be between 2 and 4 cm in its greatest dimension, which is contrary to the 5-cm tumor described. - While **N1** is correctly assigned for the lymph node, the T-stage is incorrect. *T2 N2 M0* - A **T2** tumor classification is incorrect given the 5-cm size of the primary tumor. - **N2** would indicate multiple ipsilateral lymph nodes, a single ipsilateral lymph node > 3 cm but ≤ 6 cm, or bilateral/contralateral lymph nodes, which is not consistent with a single 2-cm lymph node. *T1 N1 M0* - A **T1** tumor would be 2 cm or smaller in its greatest dimension, which is incorrect for a 5-cm tumor. - While **N1** is correctly assigned for the lymph node, the T-stage is incorrect.
Question 3: Which of the following stages of Breast Cancer corresponds to the following features: a breast mass of 6 x 3 cm, ipsilateral supraclavicular lymph node involvement, and distant metastasis that cannot be assessed?
- A. T4 N3 MX
- B. T4 N1 M1
- C. T4 N0 M0
- D. T3 N3c MX (Correct Answer)
Explanation: ***T3 N3c MX*** - A **breast mass of 6 x 3 cm** indicates a T3 tumor (tumor size > 5 cm). - **Ipsilateral supraclavicular lymph node involvement** is classified as N3c disease. **Distant metastasis that cannot be assessed** is denoted by MX. *T4 N3 MX* - A **T4 classification** is reserved for tumors with direct extension to the chest wall or skin, or inflammatory breast cancer, which is not mentioned here. - While N3c and MX are correct for the nodal and metastatic status, the T stage is inaccurate based on the provided tumor size. *T4 N1 M1* - A **T4 classification** is incorrect as the mass size alone (6 x 3 cm) does not meet T4 criteria. - **N1** denotes involvement of 1-3 axillary lymph nodes, which is less extensive than supraclavicular involvement (N3c). **M1** indicates confirmed distant metastasis, but the question states it "cannot be assessed" (MX). *T4 N0 M0* - **T4** is incorrect, as this stage is for direct chest wall/skin involvement or inflammatory breast cancer. - **N0** signifies no regional lymph node metastasis, contradicting the presence of supraclavicular lymph node involvement. **M0** indicates no distant metastasis, whereas the question specifies it cannot be assessed (MX).
Question 4: N3a TNM staging of head and neck tumors (AJCC 8th edition) shows:
- A. Metastasis in a lymph node >6 cm (Correct Answer)
- B. Metastasis in lymph nodes >2 cm
- C. Metastasis in lymph nodes >5 cm
- D. None of the options
Explanation: ***Metastasis in a lymph node >6 cm*** - **N3a disease** in head and neck cancer staging (AJCC 8th edition) specifically refers to metastasis in a single lymph node larger than 6 cm in greatest dimension **without extranodal extension (ENE)**. - This applies to oral cavity, oropharynx (HPV-negative), hypopharynx, and larynx cancers. - **Note:** N3 staging also includes **N3b** (metastasis in any node with clinically overt ENE), but this question specifically asks about N3a criteria. *Metastasis in lymph nodes >2 cm* - Lymph nodes in the 2-3 cm range typically fall within **N1 or N2a categories**, depending on laterality and number of involved nodes. - **N3a disease** requires a single lymph node to exceed 6 cm in greatest dimension without ENE. *Metastasis in lymph nodes >5 cm* - A lymph node between 3-6 cm is usually classified as **N2 disease** (N2a if single ipsilateral ≤6 cm, N2b if multiple ipsilateral ≤6 cm, N2c if bilateral or contralateral ≤6 cm). - To be classified as **N3a**, the lymph node must be **>6 cm** without extranodal extension. *None of the options* - This option is incorrect because the first option accurately describes the size criterion for **N3a TNM staging** in head and neck tumors according to AJCC 8th edition guidelines. - While N3 staging has two subcategories (N3a and N3b), the size criterion of >6 cm correctly defines N3a disease.
Question 5: What finding during surgery can change the staging of a tumor from Stage I to Stage II in a patient with a history of lung cancer?
- A. Involvement of the chest wall
- B. Small cell histology
- C. Tumor at the carina
- D. Positive hilar/peribronchial lymph nodes (Correct Answer)
Explanation: ***Positive bronchial lymph nodes*** - The presence of **positive bronchial lymph nodes** (N1) indicates regional lymph node involvement, necessitating an upgrade to Stage II from Stage I [1]. - This finding is significant in lung cancer staging, suggesting metastasis beyond the primary tumor. *Tumor at the carina* - A tumor at the **carina** may imply local invasion but does not specifically relate to lymph node involvement for upgrading the stage. - This would indicate a more advanced tumor stage only if it invaded adjacent structures directly. *Involvement of the chest wall* - Chest wall involvement typically refers to **direct extension of the tumor** and might upgrade the stage to III, not II. - The initial staging focused on **nodal involvement**, which is not indicated in this case. *Small cell histology* - Small cell carcinoma, while aggressive and often systemic, does not correspond with this staging system based on **N classification**. - It also usually presents with different clinical features and patterns compared to non-small cell lung cancers. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 725.
Question 6: Which of the following stages of lip carcinoma does not have nodal involvement?
- A. T2N1
- B. T3N0 (Correct Answer)
- C. T2N2
- D. T1N1
Explanation: ***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).
Question 7: Which of the following is not considered a contraindication for pancreaticoduodenectomy?
- A. Metastasis
- B. Portal vein involvement (Correct Answer)
- C. Extensive invasion of superior mesenteric vein
- D. Stage III CA head of pancreas
Explanation: ***Portal vein involvement*** - While extensive portal vein invasion can make the procedure challenging, **segmental portal vein involvement without complete occlusion or direct invasion of the superior mesenteric artery** is often considered resectable with venous reconstruction and is not an absolute contraindication. - Advancements in surgical techniques and patient selection criteria allow for **safe resection and reconstruction of the portal vein** in carefully chosen cases, improving outcomes for patients who would otherwise be deemed inoperable. *Metastasis* - The presence of **distant metastases** (e.g., to the liver, peritoneum, or lungs) unequivocally indicates **Stage IV disease** and is an absolute contraindication to pancreaticoduodenectomy, as the surgery would not offer a curative benefit. - In such cases, systemic chemotherapy or palliative care is the more appropriate treatment approach, as resection would not alter the overall prognosis. *Stage III CA head of pancreas* - **Stage III carcinoma of the head of the pancreas** often implies **locally advanced disease** that involves major peripancreatic vessels, such as the superior mesenteric artery or celiac axis. - This level of extensive vascular involvement typically renders the tumor **unresectable**, making pancreaticoduodenectomy surgically unfeasible and a contraindication. *Extensive invasion of superior mesenteric vein* - **Extensive involvement of the superior mesenteric vein (SMV)**, particularly if it completely occludes the lumen or involves a long segment making reconstruction impossible, is generally considered a contraindication to pancreaticoduodenectomy. - While limited SMV involvement with reconstructive options might be resectable, **extensive, unreconstructable invasion** signifies locally advanced disease beyond surgical cure.
Question 8: Which of the following is NOT a component of Trotter's triad associated with nasopharyngeal carcinoma?
- A. Palatal paralysis
- B. Trigeminal Neuralgia
- C. Conduction deafness
- D. Sensorineural deafness (Correct Answer)
Explanation: ***Sensorineural deafness*** - **Trotter's triad** specifically refers to unilateral **painless conductive hearing loss**, **trigeminal neuralgia**, and **palatal paralysis** in the context of nasopharyngeal carcinoma. - Sensorineural deafness is not typically part of this classic triad as the tumor's direct pressure tends to affect the Eustachian tube leading to conductive hearing loss. *Palatal paralysis* - This is a key component of **Trotter's triad**, resulting from the tumor's invasion of the **IX (glossopharyngeal)** and **X (vagus)** cranial nerves, which innervate the soft palate. - It leads to **dysphagia** and **dysarthria**, often presenting as an early symptom. *Trigeminal Neuralgia* - This refers to **unilateral facial pain** due to involvement of the **V (trigeminal)** cranial nerve, which is a core symptom of **Trotter's triad**. - The tumor's extension can cause compression or infiltration of the nerve, leading to sharp, shooting pains. *Conduction deafness* - This is a cardinal sign of **Trotter's triad** and is caused by the nasopharyngeal tumor obstructing the **Eustachian tube**. - Obstruction leads to fluid accumulation in the middle ear, resulting in **painless unilateral conductive hearing loss**.
Question 9: Which of the following is not a cause of oropharyngeal carcinoma?
- A. Occupational exposure to hydrochloric acid (Correct Answer)
- B. Smoking
- C. Human Papilloma Virus infection
- D. Occupational exposure to isopropyl oil
Explanation: **Explanation:** The primary risk factors for oropharyngeal carcinoma (OPC) are lifestyle-related and viral, rather than chemical or industrial. **1. Why Option A is the Correct Answer:** Occupational exposure to **hydrochloric acid (HCl)** is primarily associated with dental erosion and irritation of the upper respiratory tract, but it is **not** a recognized carcinogen for the oropharynx. In contrast, exposure to strong inorganic acid mists (like sulfuric acid) is linked specifically to **laryngeal cancer**, not oropharyngeal cancer. **2. Analysis of Other Options:** * **Smoking (Option B):** Tobacco use is a classic risk factor. Carcinogens like nitrosamines and polycyclic aromatic hydrocarbons cause field cancerization, leading to squamous cell carcinoma (SCC) of the entire aerodigestive tract. * **Human Papilloma Virus (Option C):** HPV (specifically **Type 16**) is now the leading cause of oropharyngeal cancer globally, especially involving the palatine tonsils and base of tongue. HPV-positive tumors have a better prognosis than tobacco-related ones. * **Isopropyl Oil (Option D):** Occupational exposure to the manufacture of isopropyl alcohol (specifically the "strong acid process" involving isopropyl oil) is a documented risk factor for cancers of the **paranasal sinuses and the oropharynx**. **Clinical Pearls for NEET-PG:** * **Most Common Site:** The **palatine tonsil** is the most common site for oropharyngeal SCC. * **HPV Marker:** **p16** immunohistochemistry is used as a surrogate marker for HPV-associated oropharyngeal cancer. * **Plummer-Vinson Syndrome:** Associated with post-cricoid (hypopharyngeal) carcinoma, not primarily oropharyngeal. * **Diet:** Deficiencies in Vitamin A and C are also implicated in the development of oral and pharyngeal malignancies.
Question 10: Trismus in carcinoma of the temporal bone occurs due to involvement of:
- A. Dura
- B. Temporomandibular joint (Correct Answer)
- C. Mastoid
- D. Eustachian tube
Explanation: **Explanation:** In the context of temporal bone carcinoma (most commonly Squamous Cell Carcinoma), **Trismus** (inability to open the mouth) is a significant clinical sign indicating **anterior extension** of the tumor. **Why the Temporomandibular Joint (TMJ) is correct:** The anterior wall of the external auditory canal (EAC) is in direct anatomical proximity to the glenoid fossa and the TMJ. When a malignancy breaches the anterior bony or cartilaginous wall of the EAC, it invades the TMJ and the associated pterygoid muscles. This infiltration leads to pain and mechanical restriction of mandibular movement, resulting in trismus. This finding usually signifies an advanced stage (T3 or T4) and a poorer prognosis. **Why other options are incorrect:** * **Dura:** Involvement of the dura (superior extension through the tegmen) leads to neurological complications, CSF otorrhea, or meningitis, but does not mechanically restrict jaw movement. * **Mastoid:** Posterior extension into the mastoid air cells causes retroauricular pain and swelling, but the mastoid process does not interface with the muscles of mastication. * **Eustachian tube:** While the tumor can involve the Eustachian tube leading to middle ear effusion and conductive hearing loss, it does not cause the muscular or joint fixation required for trismus. **High-Yield NEET-PG Pearls:** * **Most common site:** The External Auditory Canal is the most common site for temporal bone malignancy. * **Most common histology:** Squamous Cell Carcinoma. * **Clinical Red Flag:** Chronic otorrhea that becomes **blood-stained** or is associated with **deep-seated ear pain** should always be suspicious of malignancy. * **Staging:** Facial nerve palsy and Trismus are indicators of advanced disease (T4 in the modified Pittsburgh staging system).
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