Diseases of the Oral Cavity and Salivary Glands Practice Questions

Q: Which statement is true regarding tumors of the sublingual gland?

Painless swelling is a common presentation.. ### Explanation **1. Why the Correct Answer is Right:** The sublingual gland is the smallest of the major salivary glands. Like most salivary gland neoplasms, the most frequent clinical presentation is a **slow-growing, painless swelling** in the floor of the mouth. Because these tumors are often asymptomatic in the early stages, patients may delay seeking medical attention until the mass interferes with tongue mobility or speech. **2. Why the Incorrect Options are Wrong:** * **Option A (Most tumors are benign):** This is incorrect. There is an inverse relationship between the size of the salivary gland and the risk of malignancy (**Rule of 80s/20s**). While 80% of parotid tumors are benign, approximately **70–90% of sublingual gland tumors are malignant** (most commonly Adenoid Cystic Carcinoma). * **Option B (Neck dissection is never performed):** This is incorrect. Since sublingual tumors have a high rate of malignancy, surgical management often involves wide local excision (including the overlying mucosa and sometimes a portion of the mandible). If there is clinical evidence of nodal metastasis or if the pathology is high-grade (e.g., Mucoepidermoid carcinoma), a **neck dissection** is indicated. **3. High-Yield Clinical Pearls for NEET-PG:** * **Malignancy Risk:** Sublingual gland (80-90%) > Submandibular gland (40-50%) > Parotid gland (20-25%). * **Most Common Malignancy:** **Adenoid Cystic Carcinoma** is the most common malignant tumor of the sublingual gland (noted for its propensity for perineural invasion). * **Anatomy:** The sublingual gland lies above the mylohyoid muscle; a swelling here must be differentiated from a **Ranula** (plunging ranulas extend below the mylohyoid). * **The "Rule of 80s" for Parotid:** 80% are in the superficial lobe, 80% are Pleomorphic Adenoma, and 80% are benign.

Q: Ludwig's angina usually begins in which space?

Submandibular space. **Explanation:** **Ludwig’s Angina** is a rapidly spreading, life-threatening cellulitis involving the submandibular, sublingual, and submental spaces bilaterally. **Why Submandibular Space is Correct:** The infection most commonly originates from the **lower second and third molar teeth** (80% of cases). The roots of these teeth extend below the level of the **mylohyoid muscle** attachment on the mandible. Consequently, an apical abscess at these sites drains directly into the **submandibular space**. From here, the infection spreads contiguously via the posterior border of the mylohyoid muscle to involve the sublingual and submental spaces. **Why Other Options are Incorrect:** * **Sublingual space:** While this space is involved in Ludwig’s Angina (causing the characteristic elevation of the tongue), it is usually involved secondary to the submandibular space. Infections starting here typically arise from the premolars or the first molar. * **Parotid space:** This space contains the parotid gland and facial nerve. Infections here (parotitis) present with pre-auricular swelling, not the "woody" neck edema seen in Ludwig’s Angina. * **Retropharyngeal space:** Infections here are common in children (lymph node suppuration) and can lead to airway obstruction, but they do not manifest as the bilateral floor-of-mouth cellulitis characteristic of Ludwig’s Angina. **Clinical Pearls for NEET-PG:** * **Clinical Feature:** "Woody" or "Brawny" edema of the neck with superior-posterior displacement of the tongue. * **Primary Risk:** Asphyxia due to laryngeal edema/tongue displacement (Airway management is the priority). * **Microbiology:** Usually polymicrobial (Streptococci, Staphylococci, and anaerobes). * **Management:** High-dose IV antibiotics, airway protection, and incision and drainage (I&D) if there is fluctuance or failed medical management.

Q: Recurrent aphthae resemble recurrent herpes in that:

Symptoms are similar. ### Explanation **Correct Option: A. Symptoms are similar** Recurrent Aphthous Stomatitis (RAS) and Recurrent Herpes Simplex (Herpes Labialis/Stomatitis) share a very similar clinical presentation. Both conditions are characterized by **recurrent, painful, ulcerative lesions** in the oral cavity that are often preceded by a **prodromal sensation** of burning or tingling. Because both cause significant discomfort and follow a periodic pattern of eruption and healing, they are frequently confused in clinical practice. **Analysis of Incorrect Options:** * **B. Lifelong immunity results:** Neither condition confers immunity. RAS is a chronic inflammatory condition with a multifactorial etiology (stress, trauma, genetics), and Herpes is caused by a latent virus (HSV-1) that reactivates periodically. * **C. Vesicles occur with both diseases:** This is a key differentiating factor. **Herpes is a primary vesicular disease** (vesicles form and then rupture into ulcers). **Aphthous ulcers never form vesicles**; they begin directly as erythematous macules that quickly ulcerate. * **D. Intranuclear inclusion bodies are present:** These (specifically Cowdry Type A bodies) are characteristic of viral infections like Herpes. They are **absent in Aphthous ulcers**, which show non-specific inflammatory changes on histology. **High-Yield Clinical Pearls for NEET-PG:** * **Location Tip:** Aphthous ulcers occur almost exclusively on **non-keratinized/mobile mucosa** (buccal mucosa, floor of mouth). Recurrent Herpes typically affects **keratinized/fixed mucosa** (hard palate, gingiva) or the vermilion border of the lips. * **Herpetiform Aphthous Ulcers:** A subtype of RAS that presents as multiple tiny crops of ulcers. Despite the name, they are **not** caused by the Herpes virus. * **Behcet’s Syndrome:** Always consider this if oral aphthae are associated with genital ulcers and uveitis.

Q: Which structures become enlarged in the condition known as "Hairy Tongue"?

Filiform papillae. **Explanation:** **Hairy Tongue (Lingua Villosa)** is a benign clinical condition characterized by the marked hypertrophy and elongation of the **filiform papillae** on the dorsal surface of the tongue. 1. **Why Filiform Papillae is correct:** Under normal conditions, filiform papillae undergo constant desquamation. In Hairy Tongue, there is a lack of normal shedding (hyperkeratosis), causing these papillae to grow up to 15–18 mm in length. This creates a "hair-like" appearance. These elongated papillae trap debris, bacteria, and fungi (like *Candida albicans*), leading to secondary discoloration—most commonly black (**Black Hairy Tongue**) or brown. 2. **Why other options are incorrect:** * **Fungiform papillae:** These are mushroom-shaped structures scattered among filiform papillae, primarily involved in taste. They do not undergo the keratinization process required to produce a "hairy" appearance. * **Circumvallate papillae:** These are large, V-shaped papillae at the back of the tongue. While they contain taste buds and Von Ebner’s glands, they do not elongate in this condition. * **Taste buds:** These are microscopic sensory organs located within the papillae. Hairy tongue is a structural defect of the keratinized surface, not a proliferation of sensory cells. **High-Yield Clinical Pearls for NEET-PG:** * **Etiology:** Associated with poor oral hygiene, heavy smoking, excessive coffee/tea intake, and use of broad-spectrum antibiotics (which alter oral flora). * **Site:** Usually involves the **posterior two-thirds** of the tongue dorsum, anterior to the circumvallate papillae. * **Management:** Primarily involves tongue scraping/brushing and cessation of predisposing factors (e.g., smoking). * **Differential Diagnosis:** Do not confuse with **Oral Hairy Leukoplakia** (caused by EBV in HIV patients), which typically occurs on the *lateral* borders of the tongue and does not scrape off.

Q: What is the most common malignant tumor of the salivary glands?

Mucoepidermoid carcinoma. **Explanation:** **Mucoepidermoid Carcinoma (MEC)** is the most common malignant tumor of the salivary glands in both adults and children. It most frequently involves the **parotid gland**, though it is also the most common malignancy of minor salivary glands. Histologically, it is characterized by a mixture of mucus-secreting cells, squamous (epidermoid) cells, and intermediate cells. **Analysis of Options:** * **Pleomorphic Adenoma (Option A):** This is the most common **benign** tumor of the salivary glands overall. While it is the most frequent salivary neoplasm, the question specifically asks for a **malignant** tumor. * **Warthin Tumor (Option B):** Also known as Adenolymphoma, this is the second most common benign tumor. It is strongly associated with smoking and typically occurs in the tail of the parotid gland in older males. * **Adenoid Cystic Carcinoma (Option C):** This is the most common malignant tumor of the **submandibular and minor salivary glands** (specifically the palate). It is notorious for **perineural invasion**, leading to pain and "skip lesions." **High-Yield Clinical Pearls for NEET-PG:** * **Rule of 80s (Parotid Tumors):** 80% are in the parotid, 80% are benign, 80% are Pleomorphic Adenoma, and 80% occur in the superficial lobe. * **Small Gland Rule:** The smaller the salivary gland, the higher the chance of a tumor being malignant (e.g., Sublingual gland tumors are ~80% malignant). * **Most common site for MEC:** Parotid gland. * **Most common site for Adenoid Cystic Carcinoma:** Minor salivary glands (Palate).

Q: Which of the following occurs in Oral Submucous Fibrosis (OSMF)?

All of the above. **Explanation:** **Oral Submucous Fibrosis (OSMF)** is a chronic, insidious, premalignant condition characterized by progressive juxta-epithelial fibrosis of the oral cavity. It is primarily associated with the habit of chewing areca nut (betel nut). **Why "All of the above" is correct:** OSMF presents in stages, and the options represent the clinical spectrum of the disease: * **Stomatopyrosis (Option A):** This refers to a burning sensation in the mouth, which is often the earliest symptom. It is triggered by spicy foods due to the hypersensitivity of the thinning oral mucosa. * **Vesicles, Melanosis, and Xerostomia (Option B):** Early stages often involve the formation of small vesicles that rupture to form erosions. Chronic irritation leads to mucosal pigmentation (**melanosis**), and fibrosis of the minor salivary glands results in decreased salivation (**xerostomia**). * **Blanched Pallor and Stiffness (Option C):** As fibrosis progresses, the mucosa loses its vascularity and elasticity, appearing **marble-like or blanched**. Palpable vertical fibrous bands (especially in the buccal mucosa) lead to severe stiffness and restricted mouth opening (trismus). **Clinical Pearls for NEET-PG:** * **Etiology:** Areca nut (contains alkaloids like arecoline which stimulate collagen synthesis) and Copper (inhibits collagenase). * **Pathognomonic Sign:** Palpable vertical fibrous bands and "Hockey-stick" appearance of the uvula (due to fibrosis). * **Malignant Transformation:** OSMF is a **premalignant condition** with a transformation rate of approximately 7–13%, most commonly leading to Squamous Cell Carcinoma. * **Management:** Cessation of habit, intralesional steroids (to reduce inflammation), and Hyaluronidase (to break down ground substance). Surgical release is reserved for severe trismus.

Q: A pipe smoker presents with a white, elevated plaque on their buccal mucosa, discovered during a general medical examination. This lesion cannot be wiped away with sterile gauze. What is the most likely diagnosis?

Leukoplakia. **Explanation:** The clinical presentation of a white, elevated plaque on the buccal mucosa that **cannot be wiped away** is the classic definition of **Leukoplakia**. According to the WHO, leukoplakia is a clinical term for a white patch or plaque that cannot be characterized clinically or pathologically as any other disease. In this case, the patient’s history of **pipe smoking** is a significant risk factor, as chronic irritation from tobacco and heat triggers hyperkeratosis of the epithelium. **Analysis of Options:** * **Thrush (Oral Candidiasis):** While it presents as white patches, these are "pseudomembranous" and **can be easily scraped off** with gauze, leaving an erythematous (red), bleeding base. * **Squamous Cell Carcinoma (SCC):** While leukoplakia is a premalignant condition that can progress to SCC, a localized, asymptomatic white plaque without ulceration, induration, or rapid growth is more characteristic of the precursor lesion (leukoplakia) rather than frank malignancy. * **Gingivitis:** This refers specifically to inflammation of the gums (gingiva), characterized by redness, swelling, and bleeding, rather than a white plaque on the buccal mucosa. **High-Yield Clinical Pearls for NEET-PG:** * **Biopsy is mandatory:** Since 3–6% of leukoplakic patches undergo malignant transformation, a biopsy is required to rule out dysplasia or carcinoma. * **Erythroplakia:** A red, velvety patch in the mouth has a much higher risk of malignancy than leukoplakia. * **Speckled Leukoplakia:** A mix of white and red areas; it carries the highest risk of malignant transformation among leukoplakic lesions. * **Hairy Leukoplakia:** Associated with EBV in HIV-positive patients; typically occurs on the lateral borders of the tongue and is *not* premalignant.

Q: A 23-year-old female patient complains of decreased mouth opening for the past 4 days. What is the most likely cause?

Impacted third molar. **Explanation:** The correct answer is **Impacted third molar**. The key to solving this clinical scenario lies in the **acute onset** (4 days) of the symptoms. 1. **Why Impacted Third Molar is correct:** An impacted third molar (wisdom tooth) often leads to **Pericoronitis**—inflammation of the soft tissues surrounding the crown of a partially erupted tooth. This inflammation frequently spreads to the masseter muscle or the pterygomandibular space, causing **protective muscle spasm (Trismus)**. In a young adult (20–25 years), acute trismus is most commonly odontogenic in origin. 2. **Why the other options are incorrect:** * **Oral Submucous Fibrosis (OSMF):** While a very common cause of restricted mouth opening in India (due to betel nut chewing), it is a **chronic, progressive** condition. It does not develop over 4 days. * **Oropharyngeal Fibrosis:** This is typically a sequela of severe trauma, chemical burns, or radiotherapy. It is a chronic scarring process, not an acute presentation. * **Bony Ankylosis of the TMJ:** This results in permanent, severe restriction of jaw movement. It usually follows trauma or infection (like septic arthritis) and develops over **months to years**, not days. **High-Yield Clinical Pearls for NEET-PG:** * **Trismus vs. Ankylosis:** Trismus is a functional/spasmodic restriction (often reversible), whereas ankylosis is a structural/mechanical restriction. * **Most common cause of Trismus:** Impacted third molar/Pericoronitis. * **Quinsy (Peritonsillar Abscess):** Another high-yield cause of acute trismus due to irritation of the internal pterygoid muscle. * **OSMF Hallmark:** Presence of palpable vertical fibrous bands in the buccal mucosa and blanched appearance.

Question 1

Which statement is true regarding tumors of the sublingual gland?

Accepted Answer

Painless swelling is a common presentation.

Answer

Most tumors are benign.

Answer

Neck dissection is never performed.

Answer

All of the above

Question 2

Ludwig's angina usually begins in which space?

Accepted Answer

Submandibular space

Answer

Sublingual space

Answer

Parotid space

Answer

Retropharyngeal space

Question 3

Recurrent aphthae resemble recurrent herpes in that:

Accepted Answer

Symptoms are similar

Answer

Lifelong immunity results

Answer

Vesicles occur with both diseases

Answer

Intranuclear inclusion bodies are present

Question 4

Which structures become enlarged in the condition known as "Hairy Tongue"?

Accepted Answer

Filiform papillae

Answer

Fungiform papillae

Answer

Circumvallate papillae

Answer

Taste buds

Question 5

What is the most common malignant tumor of the salivary glands?

Accepted Answer

Mucoepidermoid carcinoma

Answer

Pleomorphic adenoma

Answer

Warthin tumor

Answer

Adenoid cystic carcinoma

Question 6

Which of the following occurs in Oral Submucous Fibrosis (OSMF)?

Accepted Answer

All of the above

Answer

Stomatopyrosis

Answer

Vesicles, melanosis, and xerostomia

Answer

Blanched pallor with hard subepithelial stiffness

Question 7

A pipe smoker presents with a white, elevated plaque on their buccal mucosa, discovered during a general medical examination. This lesion cannot be wiped away with sterile gauze. What is the most likely diagnosis?

Accepted Answer

Leukoplakia

Answer

Squamous cell carcinoma

Answer

Thrush

Answer

Gingivitis

Question 8

Which salivary gland tumor is associated with smoking?

Accepted Answer

Warthin tumour

Answer

Cannicular adenoma

Answer

Pleomorphic adenoma

Answer

Ductal papilloma

Question 9

Dilation of the salivary duct secondary to epithelial atrophy as a result of repeated inflammatory or infectious process is termed as?

Accepted Answer

Sialodochitis

Answer

Sialadenitis

Answer

Sialolithiasis

Answer

Mucocele

Question 10

A 23-year-old female patient complains of decreased mouth opening for the past 4 days. What is the most likely cause?

Accepted Answer

Impacted third molar

Answer

Oral submucous fibrosis

Answer

Oropharyngeal fibrosis

Answer

Bony ankylosis of the temporomandibular joint

Diseases of the Oral Cavity and Salivary Glands — MCQs

Diseases of the Oral Cavity and Salivary Glands — MCQs

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