Diseases of the Oral Cavity and Salivary Glands Practice Questions

Q: What is the recommended treatment for leukoplakia?

Repositioning of ill-fitting dentures. **Explanation:** Leukoplakia is defined by the WHO as a "white patch or plaque that cannot be characterized clinically or pathologically as any other disease." It is a **premalignant condition** often triggered by chronic irritation. **Why Option D is Correct:** The primary management of leukoplakia begins with the **elimination of provocative factors**. Common irritants include tobacco, alcohol, sharp teeth, and **ill-fitting dentures**. In many cases, removing the source of chronic mechanical trauma (e.g., repositioning or replacing a poorly fitted denture) leads to the spontaneous regression of the lesion. Conservative management and observation are preferred before proceeding to surgical interventions, especially for homogenous types. **Why Other Options are Incorrect:** * **A. Local Excision:** While surgical excision (or laser ablation) is indicated for "speckled" leukoplakia or lesions showing high-grade dysplasia on biopsy, it is not the first-line "recommended treatment" until conservative measures and biopsy results are evaluated. * **B. Excision and Radiotherapy:** Radiotherapy is contraindicated for leukoplakia. It can cause further tissue damage and may even trigger malignant transformation in a premalignant field. * **C. Topical Chemotherapy:** While agents like Bleomycin or Vitamin A (Retinoids) have been studied, they are not standard first-line treatments due to high recurrence rates and side effects. **Clinical Pearls for NEET-PG:** * **Most common site:** Buccal mucosa and commissures. * **Highest risk of malignancy:** The **"Speckled" (Erythroleukoplakia)** variety has the highest rate of malignant transformation compared to the homogenous type. * **Biopsy Rule:** Any leukoplakia that does not resolve within 2–4 weeks after removing the irritant must undergo biopsy to rule out squamous cell carcinoma. * **Histology:** Look for hyperkeratosis, acanthosis, and varying degrees of dysplasia.

Q: Heck's disease is another name for which of the following conditions?

Focal epithelial hyperplasia. **Explanation:** **Focal Epithelial Hyperplasia (Heck’s Disease)** is a rare, benign condition of the oral mucosa caused by **Human Papillomavirus (HPV) types 13 and 32**. It is characterized by multiple, smooth, soft, flattened papules that are typically the same color as the surrounding mucosa. It is most commonly seen in children and young adults, particularly in specific ethnic groups (e.g., Native Americans and Eskimos). The lesions are usually asymptomatic and often regress spontaneously. **Analysis of Options:** * **Option A (Correct):** Heck’s disease is the eponymous name for Focal Epithelial Hyperplasia. * **Option B (Incorrect):** Fibromatosis gingiva (Gingival Fibromatosis) is a hereditary condition characterized by slow, progressive, non-inflammatory fibrous enlargement of the maxillary and mandibular gingiva. * **Option C (Incorrect):** Oral melanotic macule is a flat, brown-to-black pigmented lesion caused by increased focal melanin production; it is not viral in origin. * **Option D (Incorrect):** Hereditary intestinal polyposis syndrome (Peutz-Jeghers Syndrome) presents with hamartomatous gastrointestinal polyps and characteristic perioral melanotic freckles, not epithelial hyperplasia. **High-Yield Clinical Pearls for NEET-PG:** * **Etiology:** HPV 13 and 32 (Highly specific for this condition). * **Histology:** Characterized by **acanthosis** and **mitosoid cells** (cells with fragmented, chromatin-like nuclear material resembling a mitotic figure). * **Site:** Most common on the lower lip, buccal mucosa, and tongue. * **Management:** Usually conservative (observation) as lesions tend to undergo spontaneous regression.

Q: Which anatomical site of leukoplakia carries the highest risk of oral cancer?

Floor of the mouth. **Explanation:** Leukoplakia is a clinical term for a white patch or plaque that cannot be characterized clinically or pathologically as any other disease. While most leukoplakias are benign, certain anatomical sites carry a significantly higher risk of malignant transformation into Oral Squamous Cell Carcinoma (OSCC). **1. Why "Floor of the Mouth" is Correct:** The floor of the mouth, along with the **ventrolateral surface of the tongue** and the **soft palate complex**, are considered "high-risk" zones. The epithelium in these areas is non-keratinized, thin, and highly permeable. This allows carcinogens (from tobacco and alcohol) dissolved in saliva to pool in the floor of the mouth and penetrate the basement membrane more effectively, leading to a higher rate of dysplasia and subsequent malignancy. **2. Analysis of Incorrect Options:** * **Buccal Mucosa (A):** This is the most common site for leukoplakia (often due to chronic irritation or friction), but it has a relatively low rate of malignant transformation compared to the floor of the mouth. * **Commissures (B):** While leukoplakia at the angles of the mouth (often associated with *Candida albicans* or "Candidal Leukoplakia") carries a moderate risk, it does not statistically exceed the risk associated with the floor of the mouth. * **Any of the above (D):** Incorrect because risk is not uniform across the oral cavity; it is site-specific. **Clinical Pearls for NEET-PG:** * **Highest Risk Morphology:** **Speckled leukoplakia** (Erythroleukoplakia) has a much higher malignant potential than homogenous leukoplakia. * **Proliferative Verrucous Leukoplakia (PVL):** A high-risk, multi-focal variant often seen in elderly females, strongly associated with progression to SCC. * **Biopsy Gold Standard:** An incisional biopsy from the most erythematous or indurated area is mandatory for definitive diagnosis.

Q: Which of the following salivary gland tumors has the highest rate of malignant transformation?

Minor salivary gland tumors. ### Explanation The risk of malignancy in salivary gland tumors follows an **inverse relationship** with the size of the gland. This is a fundamental concept in ENT oncology: the smaller the salivary gland, the higher the probability that a tumor arising from it will be malignant. **1. Why Minor Salivary Gland Tumors are Correct:** Minor salivary glands are distributed throughout the oral cavity (palate, lips, tongue). Approximately **50–80%** of tumors arising from these glands are malignant. The most common site is the hard palate, and the most common malignancy is **Adenoid Cystic Carcinoma**. **2. Analysis of Incorrect Options:** * **Parotid Gland (Option A):** This is the most common site for salivary tumors overall (80%), but it has the **lowest** rate of malignancy (only ~20–25%). Most are benign Pleomorphic Adenomas. * **Submandibular Gland (Option B):** Approximately **40–50%** of tumors here are malignant. While higher than the parotid, it is lower than the minor glands. * **Sublingual Gland (Option C):** Tumors here are rare, but about **70–80%** are malignant. While this rate is very high, statistically, minor salivary glands (as a group) are often cited in exams as the category with the highest overall clinical burden of malignancy. **3. High-Yield NEET-PG Pearls:** * **Rule of 80s (Parotid):** 80% occur in the parotid; 80% of those are benign; 80% of those are Pleomorphic Adenomas. * **Most Common Benign Tumor:** Pleomorphic Adenoma (all glands). * **Most Common Malignant Tumor:** Mucoepidermoid Carcinoma (overall). * **Adenoid Cystic Carcinoma:** Known for **perineural invasion** and "skip lesions." * **Warthin’s Tumor:** Almost exclusive to the parotid; associated with smoking and often bilateral.

Q: Which of the following best represents a ranula?

Cystic swelling in the floor of mouth. **Explanation:** **Ranula** is a clinical term used to describe a translucent, bluish, cystic swelling occurring in the **floor of the mouth**. It is essentially a **mucous extravasation cyst** that arises from the sublingual salivary gland. The name is derived from the Latin word *Rana* (frog), as the swelling resembles the translucent underbelly of a frog. * **Why Option C is Correct:** A ranula occurs when there is trauma or obstruction to the ducts of the **sublingual gland** (or rarely the submandibular gland), leading to the leakage and accumulation of mucus into the surrounding connective tissue of the floor of the mouth. **Analysis of Incorrect Options:** * **Option A (Epulis):** This refers to a localized tumor-like gingival enlargement (e.g., fibrous epulis, pregnancy tumor). It occurs on the gums, not the floor of the mouth. * **Option B (Thyroglossal cyst):** This is a midline neck swelling resulting from a persistent thyroglossal duct. While it moves with protrusion of the tongue, it is not an intraoral cystic swelling of the floor of the mouth. * **Option D (Forked uvula):** Also known as a bifid uvula, this is a congenital split in the uvula, often considered a marker for a sub-mucous cleft palate. **High-Yield Clinical Pearls for NEET-PG:** * **Plunging Ranula:** A clinical variant where the mucus extravasates through or around the **mylohyoid muscle**, presenting as a swelling in the submandibular region (neck). * **Treatment:** The treatment of choice is **Marsupialization** or complete surgical excision of the cyst along with the offending sublingual gland. * **Differential Diagnosis:** Must be differentiated from a **Dermoid cyst**, which is usually midline and has a "doughy" consistency, unlike the fluctuant, bluish ranula.

Q: Swollen, hyperemic fungiform papillae are seen in which of the following conditions?

Scarlet fever. ### Explanation The correct answer is **Scarlet Fever**. In Scarlet fever (caused by Group A Streptococcus), the tongue undergoes characteristic changes due to inflammation and desquamation. Initially, the tongue has a white coating through which swollen, hyperemic (red) fungiform papillae protrude, a stage known as the **"White Strawberry Tongue."** After a few days, the white coating desquamates, leaving a bright red, denuded surface with prominent, swollen papillae, known as the **"Red Strawberry Tongue"** or "Raspberry Tongue." #### Analysis of Incorrect Options: * **A. Riboflavin (B2) deficiency:** Characteristically presents with **Magenta Tongue** (purplish-red discoloration) and glossitis, often accompanied by angular stomatitis and cheilosis. * **B. Familial dysautonomia (Riley-Day syndrome):** This is a rare genetic disorder characterized by a **congenital absence of fungiform papillae**, leading to a smooth tongue and taste deficits. * **D. Median rhomboid glossitis:** Presents as a painless, **rhomboid-shaped erythematous area** in the midline of the posterior dorsal tongue, just anterior to the circumvallate papillae. It is now considered a form of chronic atrophic candidiasis. #### High-Yield Clinical Pearls for NEET-PG: * **Strawberry Tongue** is also a classic feature of **Kawasaki Disease** (along with cracked lips and conjunctival injection). * **Bald Tongue (Atrophic Glossitis):** Seen in Vitamin B12, Folate, and Iron deficiency (Plummer-Vinson Syndrome). * **Geographic Tongue (Benign Migratory Glossitis):** Characterized by migrating areas of depapillation with white borders; it is a benign, inflammatory condition. * **Hairy Leukoplakia:** Seen in HIV/Immunocompromised patients, caused by **EBV**, typically on the lateral borders of the tongue.

Q: What is a ranula?

Arises from the mucosa of the floor of the mouth. A **Ranula** is a clinical term used to describe a translucent, bluish, cystic swelling found in the floor of the mouth. ### **Explanation of the Correct Answer** The correct answer is **B**. A ranula is a **mucous extravasation cyst** that arises from the sublingual salivary gland (or occasionally the minor salivary glands) in the floor of the mouth. It occurs due to the rupture of a salivary duct, leading to the accumulation of mucus in the surrounding connective tissue. The name "ranula" is derived from the Latin word *rana* (frog), as the swelling resembles the translucent underbelly of a frog. ### **Why Other Options are Incorrect** * **A. Hypertrophied lymphoid tissue:** This describes conditions like tonsillar hypertrophy or adenoids. Ranulas are cystic and contain saliva, not lymphoid cells. * **C. Hard and hemorrhagic:** Ranulas are characteristically **soft, fluctuant, and painless**. They are bluish-translucent, not hemorrhagic (bloody), unless traumatized. * **D. An abscess:** An abscess is an acute inflammatory collection of pus, usually associated with pain, fever, and tenderness. A ranula is a non-inflammatory retention/extravasation phenomenon. ### **NEET-PG High-Yield Pearls** * **Plunging Ranula:** A clinical variant where the mucus extravasates through the **mylohyoid muscle**, presenting as a swelling in the submandibular region or neck. * **Diagnosis:** Primarily clinical. On aspiration, it reveals thick, "egg-white" viscid fluid with high amylase content. * **Treatment of Choice:** **Marsupialization** (for small cysts) or **complete excision of the cyst along with the sublingual gland** (to prevent recurrence). Simple aspiration has a very high recurrence rate.

Question 1

What is the recommended treatment for leukoplakia?

Accepted Answer

Repositioning of ill-fitting dentures

Answer

Local excision

Answer

Excision and radiotherapy

Answer

Topical chemotherapy

Question 2

Heck's disease is another name for which of the following conditions?

Accepted Answer

Focal epithelial hyperplasia

Answer

Fibromatosis gingiva

Answer

Oral melanotic macule

Answer

Hereditary intestinal polyposis syndrome

Question 3

Which anatomical site of leukoplakia carries the highest risk of oral cancer?

Accepted Answer

Floor of the mouth

Answer

Buccal mucosa

Answer

Commisures

Answer

Any of the above

Question 4

Diffuse erythema with pinpoint petechiae and white patches in a smoker's palate occur due to which of the following mechanisms?

Accepted Answer

Keratinization with partially occluded minor salivary glands

Answer

Complete obstruction of minor salivary gland orifices

Answer

Diffuse parakeratinization of the palate

Answer

Excessive orthokeratinization of the palate

Question 5

Which of the following salivary gland tumors has the highest rate of malignant transformation?

Accepted Answer

Minor salivary gland tumors

Answer

Parotid gland tumors

Answer

Submandibular gland tumors

Answer

Sublingual gland tumors

Question 6

Which of the following best represents a ranula?

Accepted Answer

Cystic swelling in the floor of mouth

Answer

A type of epulis

Answer

A thyroglossal cyst

Answer

Forked uvula

Question 7

Epulis is classified as:

Accepted Answer

Malignant

Answer

Benign

Answer

Reactive process

Answer

Precancerous

Question 8

Swollen, hyperemic fungiform papillae are seen in which of the following conditions?

Accepted Answer

Scarlet fever

Answer

Riboflavin deficiency

Answer

Familial dysautonomia

Answer

Median rhomboid glossitis

Question 9

What is a ranula?

Accepted Answer

Arises from the mucosa of the floor of the mouth

Answer

Hypertrophied lymphoid tissue

Answer

Hard and hemorrhagic

Answer

An abscess

Question 10

A 70-year-old male with a 50-year history of chewing tobacco presents with a six-month history of a large, fungating, soft papillary lesion in the oral cavity. The lesion has penetrated into the mandible. Lymph nodes are not palpable. Two biopsies from the lesion show benign-appearing papillomatosis with hyperkeratosis and acanthosis infiltrating the subjacent tissues. What is the most likely diagnosis?

Accepted Answer

Verrucous carcinoma

Answer

Squamous cell papilloma

Answer

Squamous cell carcinoma

Answer

Malignant mixed tumour

Diseases of the Oral Cavity and Salivary Glands — MCQs

Diseases of the Oral Cavity and Salivary Glands — MCQs

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