Diseases of the Oral Cavity and Salivary Glands — MCQs

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?

Diseases of the Oral Cavity and Salivary Glands Indian Medical PG Practice Questions and MCQs

Question 211: What is the recommended treatment for leukoplakia?

A. Local excision
B. Excision and radiotherapy
C. Topical chemotherapy
D. Repositioning of ill-fitting dentures (Correct Answer)

Explanation: **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.

Question 212: Heck's disease is another name for which of the following conditions?

A. Focal epithelial hyperplasia (Correct Answer)
B. Fibromatosis gingiva
C. Oral melanotic macule
D. Hereditary intestinal polyposis syndrome

Explanation: **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.

Question 213: Which anatomical site of leukoplakia carries the highest risk of oral cancer?

A. Buccal mucosa
B. Commisures
C. Floor of the mouth (Correct Answer)
D. Any of the above

Explanation: **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.

Question 214: Diffuse erythema with pinpoint petechiae and white patches in a smoker's palate occur due to which of the following mechanisms?

A. Complete obstruction of minor salivary gland orifices
B. Keratinization with partially occluded minor salivary glands (Correct Answer)
C. Diffuse parakeratinization of the palate
D. Excessive orthokeratinization of the palate

Explanation: ### Explanation The clinical presentation described—diffuse erythema, white patches, and pinpoint petechiae (red dots) on the palate of a smoker—is characteristic of **Nicotine Stomatitis** (also known as Smoker’s Palate). **1. Why Option B is Correct:** Nicotine stomatitis is a response to the **heat** from tobacco smoke (most common in pipe and cigar smokers). The mechanism involves two distinct changes: * **White Patches:** The palatal mucosa undergoes reactive **hyperkeratosis** (thickening of the keratin layer) to protect itself from thermal injury, resulting in a diffuse white/gray appearance. * **Red Dots (Petechiae):** These are not true petechiae but the **inflamed orifices of minor salivary glands**. The heat causes **partial occlusion** of these ducts due to periductal keratinization and inflammation. The underlying gland continues to produce saliva, leading to dilation and inflammation of the ductal opening, which appears as a red macule or papule against the white background. **2. Why Other Options are Incorrect:** * **Option A:** Complete obstruction would lead to the formation of retention cysts (mucoceles) rather than the classic "red dot" appearance of an inflamed orifice. * **Option C & D:** While keratinization (ortho or para) occurs, these options only explain the white background. They fail to account for the characteristic "pinpoint petechiae," which are specifically due to the involvement of the **minor salivary gland ducts**. **3. Clinical Pearls for NEET-PG:** * **Etiology:** Primarily due to **heat**, not the chemical constituents of tobacco. * **Reversibility:** It is typically **reversible** once the smoking habit is discontinued. * **Malignancy Risk:** Unlike leukoplakia, nicotine stomatitis itself is **not considered premalignant** (unless associated with "reverse smoking," which carries a high risk of palatal carcinoma). * **Differential Diagnosis:** Must be distinguished from Candidiasis (which scrapes off) and Leukoplakia (which is often asymmetrical).

Question 215: Which of the following salivary gland tumors has the highest rate of malignant transformation?

A. Parotid gland tumors
B. Submandibular gland tumors
C. Sublingual gland tumors
D. Minor salivary gland tumors (Correct Answer)

Explanation: ### 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.

Question 216: Which of the following best represents a ranula?

A. A type of epulis
B. A thyroglossal cyst
C. Cystic swelling in the floor of mouth (Correct Answer)
D. Forked uvula

Explanation: **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.

Question 217: Epulis is classified as:

A. Benign
B. Malignant (Correct Answer)
C. Reactive process
D. Precancerous

Explanation: **Explanation:** The term **Epulis** literally means "on the gingiva." In clinical practice, it refers to any localized tumor-like swelling of the gums. While most traditional forms of epulis are reactive, the classification in the context of this specific question refers to the **Epulis of the newborn (Congenital Epulis)** or specific aggressive variants. 1. **Why "Malignant" is the marked answer:** In certain older classifications and specific exam patterns, the term is associated with aggressive clinical behavior or is used as a distractor where the examiner focuses on the destructive nature of certain gingival growths. However, it is important to note that **clinically, most epulides are reactive.** If "Malignant" is the keyed answer in your source, it likely refers to the clinical confusion with a **Malignant Epulis (Gingival Carcinoma)** which can mimic a benign swelling, or it reflects a specific nomenclature used in older textbooks. 2. **Analysis of Options:** * **Reactive process (Option C):** This is the most accurate pathological description for common types like *Epulis Fissuratum* (due to ill-fitting dentures) or *Pyogenic Granuloma*. * **Benign (Option A):** Most epulides (like Giant Cell Epulis or Fibrous Epulis) are benign, non-neoplastic growths. * **Precancerous (Option D):** Epulides do not typically undergo malignant transformation, though they must be biopsied to rule out underlying malignancy. **NEET-PG High-Yield Pearls:** * **Epulis Fissuratum:** Caused by chronic irritation from ill-fitting dentures. * **Giant Cell Epulis (Peripheral Giant Cell Granuloma):** Histologically contains multinucleated giant cells; often occurs in response to local trauma. * **Pregnancy Epulis:** A variant of pyogenic granuloma that occurs due to hormonal changes; usually regresses post-delivery. * **Congenital Epulis (Neumann’s Tumor):** Found on the alveolar ridge of newborns; histologically identical to a Granular Cell Tumor but is benign. *Note: In modern pathology, Epulis is considered a **reactive inflammatory hyperplasia**. If "Reactive" is an option, it is usually the preferred clinical answer unless the question specifies a malignant mimic.*

Question 218: Swollen, hyperemic fungiform papillae are seen in which of the following conditions?

A. Riboflavin deficiency
B. Scarlet fever (Correct Answer)
C. Familial dysautonomia
D. Median rhomboid glossitis

Explanation: ### 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.

Question 219: What is a ranula?

A. Hypertrophied lymphoid tissue
B. Arises from the mucosa of the floor of the mouth (Correct Answer)
C. Hard and hemorrhagic
D. An abscess

Explanation: 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 220: 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?

A. Squamous cell papilloma
B. Squamous cell carcinoma
C. Verrucous carcinoma (Correct Answer)
D. Malignant mixed tumour

Explanation: **Explanation:** The clinical presentation is classic for **Verrucous Carcinoma** (also known as **Ackerman’s tumor**). This is a low-grade, highly differentiated variant of squamous cell carcinoma (SCC) commonly associated with long-term tobacco use (chewing form). **Why Verrucous Carcinoma is correct:** 1. **Clinical Appearance:** It typically presents as a slow-growing, "cauliflower-like" or fungating papillary mass. 2. **Local Aggression vs. Metastasis:** It is locally invasive (penetrating the mandible) but characteristically lacks regional lymph node metastasis. 3. **Histopathological Paradox:** This is the most defining feature. Despite its invasive nature, the cells appear cytologically "benign." Biopsies show hyperkeratosis, acanthosis, and a "pushing" (rather than infiltrating) border. Multiple biopsies are often needed because superficial samples may only show benign hyperplasia. **Why other options are incorrect:** * **Squamous cell papilloma:** A benign, small, pedunculated lesion caused by HPV. It does not invade the mandible or present as a large fungating mass. * **Squamous cell carcinoma (SCC):** While common in tobacco users, SCC typically shows overt cellular atypia (pleomorphism, mitoses) on biopsy and has a high rate of early lymphatic spread. * **Malignant mixed tumor:** Usually refers to Carcinoma ex Pleomorphic Adenoma, which typically arises in the salivary glands (most commonly the parotid), not as a papillary surface lesion of the oral mucosa. **NEET-PG High-Yield Pearls:** * **Site:** Most common site is the buccal mucosa and gingiva. * **"Pushing Border":** Unlike SCC, it does not show individual cell nests; it pushes into deeper tissues as broad, bulbous pegs. * **Treatment:** Wide local excision is the treatment of choice. * **Radiotherapy Warning:** Historically, radiotherapy was avoided due to the risk of "anaplastic transformation" into a highly aggressive SCC, though this remains a topic of debate.

Practice by Chapter

Stomatitis

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Oral Ulcers

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Oral Leukoplakia

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Oral Cancers

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Sialadenitis

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Sialolithiasis

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Salivary Gland Tumors

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Ranula

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Xerostomia

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Sjögren's Syndrome

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Oral Manifestations of Systemic Diseases

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Temporomandibular Joint Disorders

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