ENT Oncology Practice Questions

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: Which of the following conditions is the primary indication for radiotherapy?

Nasopharyngeal Carcinoma T3N1. **Explanation:** **1. Why Nasopharyngeal Carcinoma (NPC) is the Correct Answer:** Nasopharyngeal carcinoma is unique among head and neck cancers because it is **highly radiosensitive**. Due to its anatomical location (deep-seated, close to the skull base and vital structures), surgical access with wide margins is technically difficult and often impossible. Therefore, **Radiotherapy (RT)**, often combined with chemotherapy for advanced stages (T3/T4), is the **primary and definitive treatment** for all stages of NPC, regardless of T or N status. **2. Analysis of Incorrect Options:** * **B, C, and D (Laryngeal Carcinomas):** For T3 lesions of the supraglottis, glottis, and subglottis, the standard of care is typically **Concurrent Chemoradiotherapy (CCRT)** for organ preservation or **Total Laryngectomy** followed by postoperative RT. Unlike NPC, these are not treated with RT alone as the primary modality in T3 stages because surgery remains a viable and often necessary option for advanced laryngeal disease. Specifically, subglottic tumors (Option D) have a poor prognosis and often require aggressive surgical intervention due to early lymphatic spread. **3. Clinical Pearls for NEET-PG:** * **NPC Association:** Strongly linked with **Epstein-Barr Virus (EBV)** and dietary factors (nitrosamines in salted fish). * **Fossa of Rosenmüller:** The most common site of origin for NPC. * **Trotter’s Triad:** Conductive hearing loss (serous otitis media), palatal palsy, and trigeminal neuralgia (ipsilateral) are classic signs of NPC. * **Treatment Rule:** Surgery in NPC is reserved only for residual or recurrent neck nodes (**Neck Dissection**) after the primary tumor is controlled by RT.

Q: What is the causative agent of oropharyngeal carcinoma?

Human papillomavirus (HPV). ### Explanation **Correct Answer: D. Human papillomavirus (HPV)** The incidence of oropharyngeal squamous cell carcinoma (OPSCC) has shifted significantly over the last decade. While tobacco and alcohol were historically the primary risk factors, **Human Papillomavirus (HPV)**, specifically **high-risk strain 16**, is now the leading cause of oropharyngeal cancer (especially involving the palatine tonsils and base of tongue). The underlying mechanism involves the viral oncoproteins **E6 and E7**, which inactivate the host’s tumor suppressor proteins **p53 and Rb**, respectively, leading to malignant transformation. **Why other options are incorrect:** * **Hepatitis B virus (HBV):** Primarily associated with Hepatocellular Carcinoma (HCC); it has no established role in head and neck oncology. * **Cytomegalovirus (CMV):** While a common opportunistic pathogen in immunocompromised patients, it is not considered an oncogenic virus for oropharyngeal cancer. * **Herpes simplex virus (HSV):** Associated with oral lesions (herpetic gingivostomatitis) and encephalitis, but not linked to the pathogenesis of oropharyngeal malignancy. **High-Yield Clinical Pearls for NEET-PG:** * **Site Predilection:** HPV-associated cancers typically occur in the **tonsillar crypts** and **lingual tonsils**. * **Prognosis:** HPV-positive oropharyngeal cancers generally have a **better prognosis** and better response to radiotherapy/chemotherapy compared to HPV-negative (tobacco-related) cancers. * **Surrogate Marker:** **p16 immunohistochemistry (IHC)** is used as a reliable surrogate marker for HPV infection in clinical practice. * **Staging:** Due to the better prognosis, the AJCC 8th Edition has a separate staging system for HPV-mediated (p16+) oropharyngeal cancer.

Q: What is the treatment of choice for T2 carcinoma of the nasopharynx?

Radiotherapy. **Explanation:** **Nasopharyngeal Carcinoma (NPC)** is unique among head and neck cancers due to its anatomical location, strong association with the **Epstein-Barr Virus (EBV)**, and high degree of radiosensitivity. 1. **Why Radiotherapy is the Correct Answer:** The primary treatment for NPC across almost all stages is **Radiotherapy (RT)**. The nasopharynx is surgically inaccessible for wide-margin resections, and the tumor is highly sensitive to radiation. For **T2 lesions** (tumor extending to the soft tissue of the oropharynx or nasal cavity), RT remains the mainstay. While advanced stages (T3, T4, or N+) often require concurrent Chemoradiotherapy (CCRT), RT alone or CCRT is the standard of care. 2. **Why Other Options are Incorrect:** * **Surgery (A & D):** The nasopharynx is located deep in the skull base, surrounded by vital neurovascular structures, making primary surgical resection technically difficult and morbid. Surgery is reserved only for **salvage** in cases of recurrence or persistent localized disease. * **Chemotherapy (C):** NPC is chemosensitive, but chemotherapy is never used as a standalone curative treatment. It is used as an adjunct (neoadjuvant, concurrent, or adjuvant) to radiotherapy to improve survival in locally advanced cases. **High-Yield Clinical Pearls for NEET-PG:** * **Treatment of Choice:** RT is the treatment of choice for Stage I; CCRT is the standard for Stage II to IVB. * **Most Common Site:** Fossa of Rosenmüller. * **Most Common Histology:** Undifferentiated Squamous Cell Carcinoma (WHO Type 3) – this type has the strongest link to EBV and the best prognosis due to high radiosensitivity. * **Clinical Presentation:** Often presents with the **Trotter’s Triad**: (1) Conductive hearing loss (due to Eustachian tube blockage), (2) Ipsilateral facial pain/paresthesia (Trigeminal nerve involvement), and (3) Palatal paralysis.

Q: Trotter's triad is seen in which condition?

Nasopharyngeal carcinoma. **Explanation:** **Trotter’s Triad** is a classic clinical diagnostic cluster associated with the lateral spread of **Nasopharyngeal Carcinoma (NPC)**, specifically when the tumor involves the sinus of Morgagni. The triad consists of: 1. **Conductive Hearing Loss:** Caused by Eustachian tube blockage leading to serous otitis media (Otitis Media with Effusion). 2. **Ipsilateral Temporofacial Neuralgia:** Due to involvement of the Mandibular nerve (V3) as it exits the foramen ovale, causing pain in the lower jaw and temple. 3. **Palatal Paralysis/Immobility:** Resulting from infiltration of the Levator veli palatini muscle. **Analysis of Options:** * **Nasopharyngeal Angiofibroma (Option A):** A benign but aggressive vascular tumor in adolescent males. It typically presents with painless, profuse epistaxis and nasal obstruction, not the specific neurological/palatal findings of Trotter's triad. * **Nasal Polyposis (Option B):** Presents with bilateral nasal obstruction and anosmia. It does not involve deep tissue infiltration or cranial nerve deficits. * **Acoustic Neuroma (Option C):** Presents with sensorineural hearing loss, tinnitus, and vertigo (Cranial Nerve VIII involvement), often progressing to CN V and VII deficits, but does not cause palatal paralysis or conductive loss. **High-Yield Clinical Pearls for NEET-PG:** * **EBV Association:** Nasopharyngeal carcinoma is strongly linked to the Epstein-Barr Virus. * **Fossa of Rosenmüller:** The most common site of origin for NPC. * **Nodal Involvement:** The most common presenting symptom is often a painless neck mass (level II/upper deep cervical nodes). * **Treatment of Choice:** Radiotherapy is the primary treatment for NPC as it is highly radiosensitive.

Q: What is the treatment of choice for T3N0M0 stage III carcinoma of the maxilla?

Surgery + Radiotherapy. **Explanation:** The management of Maxillary Sinus Carcinoma is primarily determined by the stage and the anatomical extent of the tumor. For **T3N0M0 (Stage III)** disease, the standard of care is **Combined Modality Therapy**, specifically **Surgery followed by Post-operative Radiotherapy (PORT).** 1. **Why Surgery + Radiotherapy is correct:** Maxillary tumors are often diagnosed at an advanced stage due to the "silent" nature of the sinus cavity. T3 lesions involve bony structures (posterior wall, floor/medial wall of orbit, or pterygoid fossa). Surgery (Total Maxillectomy) is required to achieve local control, but because these areas have complex anatomy with a high risk of microscopic residual disease, adjuvant Radiotherapy is mandatory to reduce recurrence rates and improve survival. 2. **Why other options are incorrect:** * **Radiotherapy alone:** This is generally reserved for palliative cases or patients unfit for surgery. Maxillary squamous cell carcinomas are relatively radioresistant, and RT alone has poor control rates for T3/T4 lesions. * **Chemotherapy:** Chemotherapy is not the primary treatment for maxillary cancer. It may be used as "Induction Chemotherapy" in very advanced cases or as "Concurrent Chemoradiotherapy" for unresectable tumors, but it does not replace surgery in resectable T3 cases. * **Chemotherapy + Surgery:** While sometimes used in protocols, the gold standard adjuvant treatment following surgery for Stage III/IV is Radiotherapy, not chemotherapy alone. **High-Yield 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 worse prognosis. * **Most common histology:** Squamous Cell Carcinoma. * **Most common site:** Maxillary Antrum (Sinus). * **Early sign:** Nasal obstruction or epistaxis. * **Late sign:** Cheek swelling, proptosis, or palatal ulceration.

Q: Ohgren's line passes from which anatomical landmarks?

Medial canthus to the angle of the mandible. **Explanation** **Ohgren’s line** is a theoretical plane used in ENT oncology to determine the prognosis of maxillary sinus tumors. It is an imaginary line extending from the **medial canthus of the eye to the angle of the mandible.** **1. Why Option A is Correct:** This line divides the maxillary sinus into two distinct clinical zones: * **Anteroinferior (Infrastructure):** Tumors located below and in front of this line generally have a **better prognosis** because they are more accessible surgically and present earlier with dental or cheek symptoms. * **Posterosuperior (Suprastructure):** Tumors located above and behind this line have a **poorer prognosis** due to early involvement of critical structures like the ethmoid sinuses, orbit, pterygopalatine fossa, and the base of the skull. **2. Why Other Options are Incorrect:** * **Options B & D (Lateral Canthus):** The lateral canthus is not used for Ohgren’s line. Using the lateral canthus would shift the plane too far posteriorly, failing to capture the clinically significant division of the maxillary antrum. * **Options C & D (Mastoid Process):** The mastoid process is located too far posterior to the maxillary sinus. A line drawn to the mastoid would not accurately bisect the sinus for prognostic staging. **3. Clinical Pearls for NEET-PG:** * **Lederman’s Classification:** Another high-yield system that uses two horizontal lines (passing through the floor of the orbit and the floor of the antrum) to divide the area into infrastructure, mesostructure, and suprastructure. * **Most common histology:** Squamous cell carcinoma is the most common malignancy of the maxillary sinus. * **Early Symptom:** Most maxillary tumors are asymptomatic in early stages; "unilateral nasal obstruction" or "blood-stained discharge" are common presenting complaints.

Q: A 54-year-old man, a nonsmoker, presents with a 2-month history of a nonhealing ulceration at the base of his tongue on the right side. Examination reveals a 1 cm diameter lesion with irregular borders. A biopsy shows infiltrating squamous cell carcinoma. Which of the following infectious agents is most likely to be associated with this lesion?

Human papillomavirus (HPV). ### Explanation The correct answer is **Human papillomavirus (HPV)**, specifically high-risk types like **HPV-16**. #### Why HPV is Correct The patient presents with Squamous Cell Carcinoma (SCC) of the **base of the tongue**, which is a component of the **oropharynx**. Traditionally, head and neck SCCs were primarily associated with tobacco and alcohol. However, there is a rising incidence of oropharyngeal SCC in **younger, non-smoking patients** driven by HPV infection. HPV-related cancers typically involve the lymphoid tissue of the Waldeyer’s ring (palatine and lingual tonsils/base of tongue). These tumors often have a better prognosis and higher sensitivity to radiotherapy compared to tobacco-induced cancers. #### Why Other Options are Incorrect * **Candida albicans:** While chronic hyperplastic candidiasis (candidal leukoplakia) has a small risk of malignant transformation in the oral cavity, it is not a primary driver of oropharyngeal SCC. * **Herpes simplex virus (HSV):** HSV is associated with painful, self-limiting vesicular eruptions (cold sores) but has no proven oncogenic role in head and neck cancers. * **Prevotella intermedia:** This is a gram-negative anaerobe associated with periodontal disease and Acute Necrotizing Ulcerative Gingivitis (ANUG), not carcinogenesis. #### NEET-PG High-Yield Pearls * **Most common HPV subtype:** HPV-16 is responsible for ~90% of HPV-positive oropharyngeal SCCs. * **Surrogate Marker:** **p16 immunohistochemistry** is used as a reliable surrogate marker for HPV infection in these tumors. * **Staging:** In the AJCC 8th Edition, HPV-positive (p16+) oropharyngeal cancers have a **separate staging system** due to their significantly better survival rates. * **Field Cancerization:** This concept (multiple primary tumors) is more common in tobacco-related SCC than in HPV-related SCC.

Q: Horner's syndrome is caused by which of the following?

Nasopharyngeal carcinoma metastasis. **Explanation:** **Why Option A is Correct:** Horner’s syndrome (ptosis, miosis, and anhidrosis) results from an interruption of the **sympathetic chain**. In the context of ENT oncology, Nasopharyngeal Carcinoma (NPC) is notorious for its local and regional spread. The tumor or its metastatic cervical lymph nodes (specifically the **retropharyngeal nodes of Rouviere**) can invade or compress the **cervical sympathetic trunk** located in the parapharyngeal space or near the carotid sheath. This involvement is often associated with advanced disease (Stage IV) and may occur alongside cranial nerve palsies (III, IV, V, and VI) in Trotter’s Triad or Cavernous Sinus Syndrome. **Why Other Options are Incorrect:** * **B. Facial bone injury:** While trauma can cause nerve damage, standard facial bone fractures (like Le Fort or Zygomatic) typically involve the trigeminal or facial nerves. Horner’s syndrome requires injury to the deep neck structures or the apex of the orbit, which is not a routine feature of isolated facial bone trauma. * **C. Maxillary sinusitis:** This is an inflammatory condition confined to the maxillary antrum. It does not involve the sympathetic chain. * **D. Ethmoid polyp:** These are benign mucosal protrusions in the nasal cavity/ethmoid sinuses. They cause nasal obstruction and anosmia but do not extend into the parapharyngeal space to affect sympathetic fibers. **High-Yield Clinical Pearls for NEET-PG:** * **Trotter’s Triad (NPC):** 1. Conductive hearing loss (Eustachian tube blockage), 2. Ipsilateral soft palate paralysis (CN X), 3. Trigeminal neuralgia (CN V). * **Pancoast Tumor:** Another common cause of Horner’s syndrome in exams, involving the sympathetic chain at the lung apex. * **NPC Origin:** Most commonly arises from the **Fossa of Rosenmüller**. * **EBV Association:** Strong correlation with Type II and Type III (Undifferentiated) NPC.

Question 1

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

Accepted Answer

All of the above

Answer

Intracavitary radioactive implants

Answer

Cryotherapy

Answer

Surgery

Question 2

Which of the following conditions is the primary indication for radiotherapy?

Accepted Answer

Nasopharyngeal Carcinoma T3N1

Answer

Supraglottic Carcinoma T3N0

Answer

Carcinoma of the Glottis T3N0

Answer

Subglottic Carcinoma T3N0

Question 3

What is the causative agent of oropharyngeal carcinoma?

Accepted Answer

Human papillomavirus (HPV)

Answer

Hepatitis B virus (HBV)

Answer

Cytomegalovirus (CMV)

Answer

Herpes simplex virus (HSV)

Question 4

Trismus in oral cancer patients is severe in those treated with which combination of modalities?

Accepted Answer

Surgery and Radiotherapy

Answer

Chemotherapy alone

Answer

Surgery alone

Answer

Not related to treatment

Question 5

What is the treatment of choice for T2 carcinoma of the nasopharynx?

Accepted Answer

Radiotherapy

Answer

Surgery

Answer

Chemotherapy

Answer

Surgery + postoperative radiotherapy

Question 6

Trotter's triad is seen in which condition?

Accepted Answer

Nasopharyngeal carcinoma

Answer

Nasopharyngeal angiofibroma

Answer

Nasal polyposis

Answer

Acoustic neuroma

Question 7

What is the treatment of choice for T3N0M0 stage III carcinoma of the maxilla?

Accepted Answer

Surgery + Radiotherapy

Answer

Radiotherapy

Answer

Chemotherapy

Answer

Chemotherapy + Surgery

Question 8

Ohgren's line passes from which anatomical landmarks?

Accepted Answer

Medial canthus to the angle of the mandible

Answer

Lateral canthus to the angle of the mandible

Answer

Medial canthus to the mastoid process

Answer

Lateral canthus to the mastoid process

Question 9

A 54-year-old man, a nonsmoker, presents with a 2-month history of a nonhealing ulceration at the base of his tongue on the right side. Examination reveals a 1 cm diameter lesion with irregular borders. A biopsy shows infiltrating squamous cell carcinoma. Which of the following infectious agents is most likely to be associated with this lesion?

Accepted Answer

Human papillomavirus (HPV)

Answer

Candida albicans

Answer

Herpes simplex virus (HSV)

Answer

Prevotella intermedia

Question 10

Horner's syndrome is caused by which of the following?

Accepted Answer

Nasopharyngeal carcinoma metastasis

Answer

Facial bone injury

Answer

Maxillary sinusitis

Answer

Ethmoid polyp

ENT Oncology — MCQs

ENT Oncology — MCQs

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