ENT Oncology Practice Questions

Q: Which site of squamous cell carcinoma has the best prognosis?

Lip. **Explanation:** The prognosis of Squamous Cell Carcinoma (SCC) in the oral cavity is primarily determined by the site's lymphatic drainage, the thickness of the lesion, and the ease of early detection. **Why Lip is the correct answer:** Carcinoma of the lip (specifically the lower lip) has the **best prognosis** among all oral cavity cancers. This is due to several factors: 1. **Early Detection:** Lesions are highly visible, leading patients to seek medical advice early. 2. **Slow Growth:** Lip SCC tends to be well-differentiated and grows slowly. 3. **Limited Lymphatic Spread:** Lymphatic metastasis occurs late. The 5-year survival rate for lip SCC is often greater than 90%. **Analysis of Incorrect Options:** * **Tongue:** This is the most common site for oral SCC but carries a **poor prognosis** due to its rich lymphatic network and constant muscular activity, which facilitates early bilateral spread to deep cervical nodes. * **Floor of the Mouth:** This site has a high risk of early nodal metastasis (submandibular nodes) because the mucosa is thin and closely related to the underlying periosteum and lymphatics. * **Palate:** While hard palate SCC is less common, it often presents at a later stage than lip cancer and can invade the maxillary sinus or palatal bone, worsening the prognosis compared to the lip. **Clinical Pearls for NEET-PG:** * **Most common site of Oral Cavity Cancer:** Tongue (lateral border). * **Most common site of Lip Cancer:** Lower lip (due to UV exposure); Upper lip cancer is rarer but more aggressive. * **Field Cancerization:** This concept (by Slaughter et al.) explains why patients with one oral SCC are at high risk for synchronous or metachronous primary tumors. * **TNM Staging:** For oral SCC, **Depth of Invasion (DOI)** is now a critical component in T-staging (AJCC 8th Edition).

Q: Woodworkers are associated with which type of sinus carcinoma?

Adenocarcinoma. **Explanation:** The correct answer is **Adenocarcinoma**. **1. Why Adenocarcinoma is correct:** There is a strong, well-documented epidemiological link between chronic exposure to **hardwood dust** (such as beech and oak) and the development of **Adenocarcinoma** of the ethmoid sinuses. Wood dust particles are thought to cause chronic mucosal irritation and contain specific chemical compounds that act as carcinogens. This is a classic occupational hazard question frequently tested in NEET-PG. **2. Why the other options are incorrect:** * **Squamous cell carcinoma (SCC):** While SCC is the **most common** overall histological type of paranasal sinus malignancy (accounting for ~80% of cases), it is more strongly associated with nickel exposure and smoking rather than wood dust specifically. It most commonly affects the maxillary sinus. * **Anaplastic carcinoma:** This is a rare, highly aggressive, and undifferentiated tumor. It does not have a specific association with woodworkers. * **Melanoma:** Sinonasal mucosal melanomas are rare and arise from melanocytes in the respiratory mucosa. Their etiology is largely unknown and not linked to occupational wood dust. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common site for Sinus Malignancy:** Maxillary Sinus. * **Most common site for Woodworker’s Adenocarcinoma:** Ethmoid Sinus. * **Nickel workers:** Associated with Squamous Cell Carcinoma. * **Leather/Footwear industry workers:** Also associated with Adenocarcinoma (similar to woodworkers). * **Ohngren’s line:** An imaginary line connecting the medial canthus to the angle of the mandible; tumors superior-posterior to this line have a poorer prognosis.

Q: Which of the following is NOT true for carcinoma of the tongue?

Adenocarcinoma is the commonest type. **Explanation:** The correct answer is **B**, as **Squamous Cell Carcinoma (SCC)**—not adenocarcinoma—is the most common histological type of tongue cancer, accounting for over 90% of cases. Adenocarcinomas are rare and typically arise from minor salivary glands within the oral cavity. **Analysis of Options:** * **Option A (Lateral border):** This is the most frequent site for tongue carcinoma (especially the middle third). The dorsum is rarely involved, and the tip/ventral surface are less common. * **Option C (Lymph node involvement):** The tongue has a rich, decussating lymphatic network. Early lymphatic spread to the cervical nodes (specifically Level II/Jugulodigastric) is a hallmark of this disease, often occurring even in early stages. * **Option D (Tobacco chewing):** Chronic irritation from tobacco (chewing or smoking), betel nut, and alcohol are the primary synergistic risk factors for oral SCC. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of Oral Cavity Cancer:** Lower lip (globally), but in India, it is the **buccal mucosa** (due to tobacco chewing). * **Premalignant lesions:** Leukoplakia (most common) and Erythroplakia (highest risk of transformation). * **Staging Tip:** Tongue cancers are staged based on size (T) and depth of invasion (DOI). A DOI > 5mm significantly increases the risk of nodal metastasis. * **Management:** Surgery is the primary treatment. For N0 necks, elective neck dissection is often performed if the tumor thickness exceeds 4mm.

Q: In which country is nasopharyngeal carcinoma most commonly found?

China. **Explanation:** Nasopharyngeal Carcinoma (NPC) exhibits a unique geographical and ethnic distribution, making it a classic "high-yield" topic in ENT oncology. **1. Why China is Correct:** The highest incidence of NPC globally is found in **Southern China** (specifically the Guangdong province) and among Southeast Asian populations. This is attributed to a multifactorial etiology involving: * **Genetic Predisposition:** Specific HLA haplotypes (HLA-A2, B17, and Bw46) common in the Cantonese population. * **Dietary Factors:** High consumption of **salted fish** containing volatile nitrosamines, which are potent carcinogens. * **Viral Association:** A near 100% association with the **Epstein-Barr Virus (EBV)**, particularly in Type II and III (undifferentiated) WHO classifications. **2. Why other options are incorrect:** * **India:** While NPC occurs in India, it is primarily endemic only in the **North-Eastern states** (like Mizoram and Nagaland) due to dietary habits like smoked meats, but the national incidence does not rival China. * **Pakistan & Japan:** These countries have a low to intermediate incidence of NPC. Japan has a higher prevalence of gastric and esophageal cancers rather than nasopharyngeal. **Clinical Pearls for NEET-PG:** * **Most Common Site:** Fossa of Rosenmüller. * **Most Common Symptom:** Painless upper deep cervical lymphadenopathy (Level II/III). * **Trotter’s Triad:** 1. Conductive hearing loss (due to Eustachian tube blockage), 2. Ipsilateral palatal paralysis, 3. Trigeminal neuralgia (V2 involvement). * **Treatment of Choice:** Radiotherapy (it is highly radiosensitive); Surgery is usually reserved for salvage. * **Tumor Marker:** Plasma EBV DNA levels are used for screening and monitoring recurrence.

Q: Mobility of teeth in carcinoma of the maxillary sinus is due to involvement by the tumor of which anatomical structure?

Floor of the sinus. **Explanation:** The clinical presentation of Maxillary Sinus Carcinoma depends on which wall of the sinus is breached by the tumor. The **floor of the maxillary sinus** is formed by the alveolar process of the maxilla and the hard palate. The roots of the upper molar and premolar teeth lie in close proximity to, or sometimes penetrate, this floor. When a tumor involves the **floor of the sinus**, it invades the alveolar bone and the periodontal ligaments. This destruction of the supporting dental architecture leads to **loosening/mobility of teeth**, dental pain, or unexplained swelling in the gingivolabial sulcus or palate. **Analysis of Incorrect Options:** * **Anterior Wall:** Involvement leads to swelling of the cheek and invasion of the facial soft tissues (infraorbital nerve involvement causes anesthesia of the cheek). * **Posterior Wall:** Involvement leads to invasion of the pterygopalatine fossa and infratemporal fossa, resulting in trismus (due to pterygoid muscle involvement) and referred earache. * **Roof:** The roof forms the floor of the orbit. Involvement leads to proptosis, diplopia, or displacement of the eyeball. **Clinical Pearls for NEET-PG:** * **Ohngren’s Line:** An imaginary line connecting the medial canthus to the angle of the mandible. Tumors **posterosuperior** to this line have a poorer prognosis than those located anteroinferiorly. * **Lederman’s Classification:** Uses two horizontal lines (passing through the floor of the orbit and the floor of the antrum) to divide the area into suprastructure, mesostructure, and infrastructure. * **Most common histology:** Squamous Cell Carcinoma (approx. 80%). * **Early Sign:** Most maxillary tumors are clinically silent; persistent unilateral "sinusitis" or blood-stained nasal discharge in an elderly patient should be investigated for malignancy.

Q: Which carcinoma most commonly metastasizes to cervical lymph nodes?

Posterior tongue. **Explanation:** The frequency of cervical lymph node metastasis in head and neck cancers is primarily determined by the **richness of the lymphatic network** and the **mobility** of the primary site. **Why Posterior Tongue is Correct:** The posterior third of the tongue (base of tongue) is part of the oropharynx. It has an extremely rich, decussating (crossing) lymphatic drainage system. Approximately **70-80% of patients** with carcinoma of the posterior tongue present with clinically positive cervical nodes at the time of diagnosis, often bilateral. In contrast, the anterior two-thirds (oral tongue) has a lower rate (approx. 30-40%). **Analysis of Incorrect Options:** * **Maxillary Sinus:** These tumors are often "clinically silent" regarding nodes. Lymphatics from the antrum are sparse and primarily drain to the retropharyngeal nodes first, rather than the cervical chain. * **Cheek (Buccal Mucosa):** While it does metastasize to Level I and II nodes, the rate is significantly lower than the tongue, usually occurring in later stages. * **Hard Palate:** This area has a very sparse lymphatic network and the mucoperiosteum is tightly bound to bone, making lymphatic spread relatively uncommon and late. **NEET-PG High-Yield Pearls:** * **Most common site for distant metastasis in ENT:** Nasopharynx (due to rich lymphatics). * **N0 Neck:** Even if nodes are not palpable, posterior tongue and pyriform sinus cancers often require elective neck dissection/irradiation due to high rates of "occult" metastasis. * **Rouviere’s Node:** The most superior node of the lateral retropharyngeal group, often involved in Nasopharyngeal Carcinoma. * **Order of Metastatic Frequency:** Hypopharynx > Tongue Base > Tonsil > Oral Tongue.

Question 1

Which site of squamous cell carcinoma has the best prognosis?

Accepted Answer

Lip

Answer

Tongue

Answer

Palate

Answer

Floor of the mouth

Question 2

Woodworkers are associated with which type of sinus carcinoma?

Accepted Answer

Adenocarcinoma

Answer

Squamous cell carcinoma

Answer

Anaplastic carcinoma

Answer

Melanoma

Question 3

Which of the following statements is NOT true regarding the hard palate?

Accepted Answer

It is typically painful.

Answer

Maxillectomy may be required for treatment.

Answer

Lymphatic spread is a possible complication.

Answer

Histologically, it can present as squamous cell carcinoma or adenocarcinoma.

Question 4

Which of the following is NOT true for carcinoma of the tongue?

Accepted Answer

Adenocarcinoma is the commonest type

Answer

Lateral border is involved

Answer

Cervical lymph node involvement is common

Answer

Tobacco chewing is a significant risk factor

Question 5

In which country is nasopharyngeal carcinoma most commonly found?

Accepted Answer

China

Answer

India

Answer

Pakistan

Answer

Japan

Question 6

Radiotherapy is used in the treatment of angiofibroma when it involves which of the following structures?

Accepted Answer

Middle cranial fossa

Answer

Cheek

Answer

Orbit

Answer

Cavernous sinus

Question 7

Mobility of teeth in carcinoma of the maxillary sinus is due to involvement by the tumor of which anatomical structure?

Accepted Answer

Floor of the sinus

Answer

Anterior wall of the sinus

Answer

Posterior wall of the sinus

Answer

Roof of the sinus

Question 8

Which of the following are features of laryngeal carcinoma?

Accepted Answer

Laryngeal compartments act as a barrier

Answer

Glottis is the most common site

Answer

Commonly metastasizes to cervical lymph nodes

Answer

Lesions are seen at the edge of the vocal cord

Question 9

What is the treatment of choice for laryngeal carcinoma of the glottis extending to the supraglottic region with vocal cord fixation and a palpable solitary ipsilateral lymph node?

Accepted Answer

Total laryngectomy with radical neck dissection

Answer

Conservative laryngectomy

Answer

Total laryngectomy

Answer

Palliative therapy

Question 10

Which carcinoma most commonly metastasizes to cervical lymph nodes?

Accepted Answer

Posterior tongue

Answer

Maxillary sinus

Answer

Cheek

Answer

Hard palate

ENT Oncology — MCQs

ENT Oncology — MCQs

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