ENT Oncology — MCQs

Q: Which of the following is not a cause of oropharyngeal carcinoma?

Occupational exposure to hydrochloric acid. **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.

Q: Epithelioid hemangioendothelioma of the nose is classified as which of the following?

Sarcoma. **Explanation:** **Epithelioid Hemangioendothelioma (EHE)** is a rare vascular neoplasm of intermediate malignancy. The correct classification is **Sarcoma** because it originates from mesenchymal tissue (specifically vascular endothelial cells). 1. **Why Sarcoma is Correct:** By definition, a sarcoma is a malignant tumor arising from mesenchymal cells (bone, cartilage, fat, muscle, or blood vessels). EHE is characterized by "epithelioid" endothelial cells that mimic epithelial cells in appearance but are positive for vascular markers like **CD31, CD34, and Factor VIII-related antigen**. It is considered an intermediate-grade vascular sarcoma, falling between a benign hemangioma and a highly aggressive angiosarcoma. 2. **Why Other Options are Incorrect:** * **Carcinoma:** These are malignant tumors of **epithelial** origin (e.g., Squamous Cell Carcinoma). While EHE has "epithelioid" features histologically, its lineage is endothelial (mesenchymal). * **Carcinosarcoma:** This is a true "mixed" tumor containing both malignant epithelial and malignant mesenchymal components. * **Hamartoma:** This is a benign, disorganized growth of mature native tissue. EHE is a neoplastic process with metastatic potential, not a developmental malformation. **High-Yield Clinical Pearls for NEET-PG:** * **Histology:** Look for "intracytoplasmic vacuoles" (lumina) containing red blood cells within epithelioid cells. * **Genetics:** Often associated with a specific translocation: **t(1;3)(p36;q25)** resulting in the **WWTR1-CAMTA1** fusion gene. * **Behavior:** It is locally invasive and has a metastatic rate of approximately 20-30%. * **Treatment:** Wide surgical excision is the primary modality; it is generally resistant to radiotherapy and chemotherapy.

Q: What is the commonest malignancy type in the oral cavity?

Squamous cell carcinoma. **Explanation:** **Correct Answer: C. Squamous cell carcinoma (SCC)** The oral cavity is lined by **stratified squamous epithelium**. Malignant transformation of these cells leads to Squamous Cell Carcinoma, which accounts for over **90-95%** of all oral cavity cancers. The primary risk factors include tobacco (smoking and smokeless), betel nut chewing, and chronic alcohol consumption. The most common site within the oral cavity for SCC is the **lower lip** (globally) or the **buccal mucosa/retro-molar trigone** (in the Indian subcontinent due to tobacco chewing habits). **Why other options are incorrect:** * **A. Adenocarcinoma:** These arise from glandular tissue. In the oral cavity, they originate from minor salivary glands. While they are the second most common group, they are far less frequent than SCC. * **B. Transitional cell carcinoma:** This type of epithelium is characteristic of the urinary tract (urothelium). It is not found in the oral cavity. * **D. Basal cell carcinoma (BCC):** BCC is a skin cancer (rodent ulcer) arising from the basal layer of the epidermis. While it commonly occurs on the face (above the line joining the tragus to the angle of the mouth), it does not arise from the oral mucosa. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site (India):** Buccal mucosa (often referred to as the "Indian Oral Cancer"). * **Most common site (Global):** Lower lip. * **Premalignant conditions:** Leukoplakia (most common), Erythroplakia (highest risk of transformation), and Oral Submucous Fibrosis (OSMF). * **Lymphatic spread:** Usually to Level I, II, and III neck nodes. * **Staging:** The "Worst Pattern of Invasion" (WPOI) and "Depth of Invasion" (DOI) are critical prognostic factors in the latest AJCC staging.

Q: Recurrent or residual cancer of the nasopharynx after supervoltage radiotherapy is treated by which of the following?

All of the above. **Explanation:** The primary treatment for Nasopharyngeal Carcinoma (NPC) is **Radiotherapy (RT)** because the tumor is highly radiosensitive and the anatomical location makes primary surgical access difficult. However, managing **recurrent or residual disease** after full-course supervoltage radiotherapy is challenging because the area has already received its maximum tolerance dose of radiation. **Why "All of the above" is correct:** When external beam radiation fails, a multi-modal salvage approach is required: 1. **Intracavitary Radioactive Implants (Brachytherapy):** This allows for a high dose of radiation to be delivered directly to the tumor site while sparing the surrounding healthy tissues that were previously irradiated. Gold grains or Iridium-192 are commonly used. 2. **Surgery (Nasopharyngectomy):** While technically demanding, salvage surgery (via maxillary swing or endoscopic approaches) is indicated for localized resectable recurrences. 3. **Cryotherapy:** This is a palliative or adjunct option used to destroy localized residual tumor cells using extreme cold, especially in patients who are not candidates for major surgery. **Clinical Pearls for NEET-PG:** * **Primary Treatment of Choice:** Radiotherapy (specifically IMRT) is the gold standard for NPC. * **EBV Association:** NPC (especially Type 2 and 3) is strongly associated with the **Epstein-Barr Virus**. Monitoring EBV DNA levels is useful for detecting recurrence. * **Fossa of Rosenmüller:** This is the most common site of origin for NPC. * **Trotter’s Triad:** A classic presentation of NPC involving: 1. Conductive deafness (Eustachian tube blockage) 2. Ipsilateral temporoparietal neuralgia (CN V involvement) 3. Palatal paralysis (CN X involvement)

Q: A 13-year-old boy presents with cheek swelling and recurrent epistaxis. What is the most likely cause?

Angiofibroma. **Explanation:** The clinical presentation of a **13-year-old boy** with **recurrent epistaxis** and **cheek swelling** is a classic "spotter" for **Juvenile Nasopharyngeal Angiofibroma (JNA)**. **1. Why Angiofibroma is correct:** JNA is a benign but locally aggressive, highly vascular tumor that occurs almost exclusively in **adolescent males** (testosterone-dependent). * **Epistaxis:** The most common symptom is profuse, painless, recurrent epistaxis due to the tumor's extreme vascularity. * **Cheek Swelling:** As the tumor grows, it typically expands from the sphenopalatine foramen into the **pterygopalatine fossa** and then laterally into the **infratemporal fossa**, leading to the characteristic "frog-face" deformity or cheek swelling. **2. Why other options are incorrect:** * **Carcinoma of the nasopharynx:** While it can cause epistaxis and nasal obstruction, it is rare in young children and more commonly presents with cervical lymphadenopathy and serous otitis media. * **Rhabdomyosarcoma:** This is the most common soft tissue sarcoma in children. While it can occur in the head and neck, it usually presents as a rapidly enlarging, painful mass rather than the classic pattern of recurrent, profuse epistaxis seen in JNA. **3. High-Yield Clinical Pearls for NEET-PG:** * **Origin:** Sphenopalatine foramen (near the posterior end of the middle turbinate). * **Holman-Miller Sign (Antral Sign):** Anterior bowing of the posterior wall of the maxillary sinus seen on CT/MRI. * **Diagnosis:** Contrast-enhanced CT (CECT) is the investigation of choice. **Biopsy is strictly contraindicated** due to the risk of torrential hemorrhage. * **Treatment:** Surgical excision (Pre-operative embolization is often done to reduce blood loss).

ENT Oncology Indian Medical PG Practice Questions and MCQs

Question 1: 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 2: Epithelioid hemangioendothelioma of the nose is classified as which of the following?

A. Carcinoma
B. Sarcoma (Correct Answer)
C. Carcinosarcoma
D. Hamartoma

Explanation: **Explanation:** **Epithelioid Hemangioendothelioma (EHE)** is a rare vascular neoplasm of intermediate malignancy. The correct classification is **Sarcoma** because it originates from mesenchymal tissue (specifically vascular endothelial cells). 1. **Why Sarcoma is Correct:** By definition, a sarcoma is a malignant tumor arising from mesenchymal cells (bone, cartilage, fat, muscle, or blood vessels). EHE is characterized by "epithelioid" endothelial cells that mimic epithelial cells in appearance but are positive for vascular markers like **CD31, CD34, and Factor VIII-related antigen**. It is considered an intermediate-grade vascular sarcoma, falling between a benign hemangioma and a highly aggressive angiosarcoma. 2. **Why Other Options are Incorrect:** * **Carcinoma:** These are malignant tumors of **epithelial** origin (e.g., Squamous Cell Carcinoma). While EHE has "epithelioid" features histologically, its lineage is endothelial (mesenchymal). * **Carcinosarcoma:** This is a true "mixed" tumor containing both malignant epithelial and malignant mesenchymal components. * **Hamartoma:** This is a benign, disorganized growth of mature native tissue. EHE is a neoplastic process with metastatic potential, not a developmental malformation. **High-Yield Clinical Pearls for NEET-PG:** * **Histology:** Look for "intracytoplasmic vacuoles" (lumina) containing red blood cells within epithelioid cells. * **Genetics:** Often associated with a specific translocation: **t(1;3)(p36;q25)** resulting in the **WWTR1-CAMTA1** fusion gene. * **Behavior:** It is locally invasive and has a metastatic rate of approximately 20-30%. * **Treatment:** Wide surgical excision is the primary modality; it is generally resistant to radiotherapy and chemotherapy.

Question 3: What is the commonest malignancy type in the oral cavity?

A. Adenocarcinoma
B. Transitional cell carcinoma
C. Squamous cell carcinoma (Correct Answer)
D. Basal cell carcinoma

Explanation: **Explanation:** **Correct Answer: C. Squamous cell carcinoma (SCC)** The oral cavity is lined by **stratified squamous epithelium**. Malignant transformation of these cells leads to Squamous Cell Carcinoma, which accounts for over **90-95%** of all oral cavity cancers. The primary risk factors include tobacco (smoking and smokeless), betel nut chewing, and chronic alcohol consumption. The most common site within the oral cavity for SCC is the **lower lip** (globally) or the **buccal mucosa/retro-molar trigone** (in the Indian subcontinent due to tobacco chewing habits). **Why other options are incorrect:** * **A. Adenocarcinoma:** These arise from glandular tissue. In the oral cavity, they originate from minor salivary glands. While they are the second most common group, they are far less frequent than SCC. * **B. Transitional cell carcinoma:** This type of epithelium is characteristic of the urinary tract (urothelium). It is not found in the oral cavity. * **D. Basal cell carcinoma (BCC):** BCC is a skin cancer (rodent ulcer) arising from the basal layer of the epidermis. While it commonly occurs on the face (above the line joining the tragus to the angle of the mouth), it does not arise from the oral mucosa. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site (India):** Buccal mucosa (often referred to as the "Indian Oral Cancer"). * **Most common site (Global):** Lower lip. * **Premalignant conditions:** Leukoplakia (most common), Erythroplakia (highest risk of transformation), and Oral Submucous Fibrosis (OSMF). * **Lymphatic spread:** Usually to Level I, II, and III neck nodes. * **Staging:** The "Worst Pattern of Invasion" (WPOI) and "Depth of Invasion" (DOI) are critical prognostic factors in the latest AJCC staging.

Question 4: Recurrent or residual cancer of the nasopharynx after supervoltage radiotherapy is treated by which of the following?

A. Intracavitary radioactive implants
B. Cryotherapy
C. Surgery
D. All of the above (Correct Answer)

Explanation: **Explanation:** The primary treatment for Nasopharyngeal Carcinoma (NPC) is **Radiotherapy (RT)** because the tumor is highly radiosensitive and the anatomical location makes primary surgical access difficult. However, managing **recurrent or residual disease** after full-course supervoltage radiotherapy is challenging because the area has already received its maximum tolerance dose of radiation. **Why "All of the above" is correct:** When external beam radiation fails, a multi-modal salvage approach is required: 1. **Intracavitary Radioactive Implants (Brachytherapy):** This allows for a high dose of radiation to be delivered directly to the tumor site while sparing the surrounding healthy tissues that were previously irradiated. Gold grains or Iridium-192 are commonly used. 2. **Surgery (Nasopharyngectomy):** While technically demanding, salvage surgery (via maxillary swing or endoscopic approaches) is indicated for localized resectable recurrences. 3. **Cryotherapy:** This is a palliative or adjunct option used to destroy localized residual tumor cells using extreme cold, especially in patients who are not candidates for major surgery. **Clinical Pearls for NEET-PG:** * **Primary Treatment of Choice:** Radiotherapy (specifically IMRT) is the gold standard for NPC. * **EBV Association:** NPC (especially Type 2 and 3) is strongly associated with the **Epstein-Barr Virus**. Monitoring EBV DNA levels is useful for detecting recurrence. * **Fossa of Rosenmüller:** This is the most common site of origin for NPC. * **Trotter’s Triad:** A classic presentation of NPC involving: 1. Conductive deafness (Eustachian tube blockage) 2. Ipsilateral temporoparietal neuralgia (CN V involvement) 3. Palatal paralysis (CN X involvement)

Question 5: A 13-year-old boy presents with cheek swelling and recurrent epistaxis. What is the most likely cause?

A. Angiofibroma (Correct Answer)
B. Carcinoma of the nasopharynx
C. Rhabdomyosarcoma
D. None of the above

Explanation: **Explanation:** The clinical presentation of a **13-year-old boy** with **recurrent epistaxis** and **cheek swelling** is a classic "spotter" for **Juvenile Nasopharyngeal Angiofibroma (JNA)**. **1. Why Angiofibroma is correct:** JNA is a benign but locally aggressive, highly vascular tumor that occurs almost exclusively in **adolescent males** (testosterone-dependent). * **Epistaxis:** The most common symptom is profuse, painless, recurrent epistaxis due to the tumor's extreme vascularity. * **Cheek Swelling:** As the tumor grows, it typically expands from the sphenopalatine foramen into the **pterygopalatine fossa** and then laterally into the **infratemporal fossa**, leading to the characteristic "frog-face" deformity or cheek swelling. **2. Why other options are incorrect:** * **Carcinoma of the nasopharynx:** While it can cause epistaxis and nasal obstruction, it is rare in young children and more commonly presents with cervical lymphadenopathy and serous otitis media. * **Rhabdomyosarcoma:** This is the most common soft tissue sarcoma in children. While it can occur in the head and neck, it usually presents as a rapidly enlarging, painful mass rather than the classic pattern of recurrent, profuse epistaxis seen in JNA. **3. High-Yield Clinical Pearls for NEET-PG:** * **Origin:** Sphenopalatine foramen (near the posterior end of the middle turbinate). * **Holman-Miller Sign (Antral Sign):** Anterior bowing of the posterior wall of the maxillary sinus seen on CT/MRI. * **Diagnosis:** Contrast-enhanced CT (CECT) is the investigation of choice. **Biopsy is strictly contraindicated** due to the risk of torrential hemorrhage. * **Treatment:** Surgical excision (Pre-operative embolization is often done to reduce blood loss).

Practice by Chapter

Staging of Head and Neck Cancer

Practice Questions

Oral Cavity Cancer

Practice Questions

Oropharyngeal Cancer and HPV

Practice Questions

Laryngeal Cancer

Practice Questions

Hypopharyngeal Cancer

Practice Questions

Sinonasal Malignancies

Practice Questions

Salivary Gland Neoplasms

Practice Questions

Thyroid Cancer

Practice Questions

Paragangliomas

Practice Questions

Principles of Radiation Therapy

Practice Questions

Chemotherapy and Targeted Therapy

Practice Questions

Surveillance and Survivorship

Practice Questions

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