Diseases of the Oral Cavity and Salivary Glands Practice Questions

Q: Bilateral parotid enlargement is seen in:

All of the above. **Explanation:** Bilateral parotid enlargement is a significant clinical finding that can result from systemic inflammatory, autoimmune, or infiltrative processes. **1. Sjögren’s Syndrome:** This is a chronic autoimmune disorder characterized by lymphocytic infiltration of exocrine glands. It classically presents with the triad of xerostomia (dry mouth), keratoconjunctivitis sicca (dry eyes), and **bilateral, painless parotid swelling** (seen in about 50% of patients). **2. Wegener’s Granulomatosis (Granulomatosis with Polyangiitis):** While primarily affecting the upper and lower respiratory tracts and kidneys, it can involve the salivary glands in approximately 1-2% of cases. It typically presents as a firm, bilateral parotid enlargement due to necrotizing granulomatous inflammation. **3. Kimura’s Disease:** This is a chronic inflammatory condition (common in young Asian males) characterized by painless subcutaneous swelling in the head and neck region, often involving the **major salivary glands bilaterally**. It is associated with peripheral eosinophilia and elevated serum IgE levels. **Clinical Pearls for NEET-PG:** * **Differential Diagnosis for Bilateral Parotid Swelling:** * **Infectious:** Mumps (most common viral cause), HIV. * **Endocrine/Metabolic (Sialadenosis):** Diabetes mellitus, chronic alcoholism, malnutrition (bulimia/anorexia). * **Autoimmune:** Sjögren’s, Sarcoidosis (Heerfordt’s syndrome: Uveitis + Parotitis + Facial palsy). * **Drugs:** Iodine, Phenylbutazone. * **High-Yield Fact:** If a patient with Sjögren’s syndrome has persistent, hard parotid swelling, suspect a transformation into **MALT Lymphoma**. * **Warthin’s Tumor:** The only salivary gland tumor that is frequently bilateral (though often metachronous).

Q: Which of the following is NOT a high-grade salivary gland malignancy?

Basal cell adenocarcinoma. **Explanation:** Salivary gland malignancies are classified into low, intermediate, and high grades based on their clinical behavior, histological features, and metastatic potential. **1. Why Basal Cell Adenocarcinoma is the correct answer:** Basal cell adenocarcinoma is considered a **low-grade malignancy**. It is the malignant counterpart of basal cell adenoma. While it is locally invasive and can recur, it has a low rate of distant metastasis and an excellent prognosis (over 90% 10-year survival rate). It should not be confused with high-grade entities. **2. Analysis of Incorrect Options:** * **Mucoepidermoid Carcinoma (MEC):** This is the most common malignant salivary gland tumor. While it can be low-grade, it frequently presents as a **high-grade** tumor (especially in the parotid), characterized by rapid growth and early metastasis. * **Adenoid Cystic Carcinoma (ACC):** This is a **high-grade** malignancy known for its relentless growth, **perineural invasion** (causing pain/palsy), and "Swiss-cheese" appearance. It has a high propensity for late distant metastasis (especially to the lungs). * **Salivary Duct Carcinoma:** This is a highly aggressive, **high-grade** malignancy that histologically resembles high-grade ductal carcinoma of the breast. It carries a very poor prognosis. **High-Yield Clinical Pearls for NEET-PG:** * **Most common salivary tumor (overall):** Pleomorphic Adenoma. * **Most common malignant salivary tumor:** Mucoepidermoid Carcinoma. * **Tumor with highest incidence of perineural invasion:** Adenoid Cystic Carcinoma. * **Hot Spot:** The **Parotid gland** is the most common site for salivary tumors, but the **Sublingual gland** has the highest *percentage* of tumors being malignant (approx. 80%).

Q: What is the most common cause of dry mouth in adults?

Antihistaminics. **Explanation:** **Xerostomia (Dry Mouth)** is a common clinical condition characterized by a subjective feeling of oral dryness, usually resulting from reduced salivary flow. **Why Antihistaminics are the correct answer:** Antihistaminics (specifically first-generation H1 blockers like Diphenhydramine) are the most frequent pharmacological cause of dry mouth. The underlying mechanism is their **anticholinergic (antimuscarinic) effect**. Salivary secretion is primarily mediated by parasympathetic stimulation via muscarinic (M3) receptors. Antihistaminics block these receptors, leading to decreased aqueous secretion from the salivary glands. Given their widespread over-the-counter use for allergies and colds, they are the most common culprit among the options provided. **Analysis of Incorrect Options:** * **A. Tranquilizers:** While certain antipsychotics and benzodiazepines can cause xerostomia, they are less commonly used by the general adult population compared to antihistaminics. * **C. Insulin:** Insulin itself does not cause dry mouth. In fact, xerostomia is a symptom of *uncontrolled diabetes* (due to polyuria and dehydration), not the insulin treatment. * **D. Birth control pills:** These are generally not associated with significant salivary gland dysfunction or xerostomia. **NEET-PG High-Yield Pearls:** * **Most common overall cause of Xerostomia:** Drug-induced (Anticholinergics, Antihistaminics, Antidepressants, Diuretics). * **Most common systemic disease causing Xerostomia:** Sjögren’s Syndrome (autoimmune destruction of exocrine glands). * **Radiotherapy:** Xerostomia is the most common late complication of head and neck radiation (permanent damage occurs at doses >25-30 Gy). * **Management:** Frequent sips of water, artificial saliva, or Sialogogues (e.g., **Pilocarpine**, a muscarinic agonist).

Q: The most common malignant tumor of the gingiva is:

Squamous cell carcinoma. **Explanation:** **Squamous Cell Carcinoma (SCC)** is the most common malignant tumor of the gingiva, accounting for over 90% of all gingival malignancies. The gingiva is lined by stratified squamous epithelium; chronic irritation from tobacco, alcohol, or poor oral hygiene leads to dysplastic changes in these keratinocytes, eventually progressing to invasive SCC. Clinically, it often presents as an exophytic growth or a non-healing ulcer, frequently mimicking common dental conditions like epulis or chronic periodontitis, which can lead to a delay in diagnosis. **Why other options are incorrect:** * **Malignant Melanoma:** While the oral cavity is a site for mucosal melanoma, it is rare (less than 1% of oral malignancies). It typically presents as a pigmented lesion on the hard palate or maxillary gingiva. * **Sarcoma & Fibrosarcoma:** These are malignant tumors of mesenchymal (connective tissue) origin. While they can occur in the jaw bones or soft tissues of the mouth, they are significantly less common than epithelial tumors like SCC. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site for Oral SCC:** Tongue (lateral border) > Floor of the mouth > Gingiva. * **Gingival SCC** is more common in the **mandible** (lower jaw) than the maxilla, usually in the molar and premolar regions. * **"Verrucous Carcinoma" (Ackerman’s tumor)** is a specific low-grade variant of SCC often associated with smokeless tobacco (betel nut chewing) and commonly involves the gingivobuccal sulcus. * **Field Cancerization:** This concept explains why patients with one oral SCC are at high risk for developing synchronous or metachronous primary tumors in the upper aerodigestive tract.

Q: Bilateral parotid enlargement does not occur in which of the following conditions?

SLE. **Explanation:** The correct answer is **SLE (Systemic Lupus Erythematosus)**. While SLE is a systemic autoimmune disease that can affect multiple organs, it typically involves the salivary glands only when it occurs in association with **Secondary Sjogren’s Syndrome**. Isolated, primary bilateral parotid enlargement is not a recognized clinical feature of SLE itself. **Analysis of Options:** * **Sjogren’s Syndrome:** This is a classic cause of bilateral, painless, or slightly tender parotid enlargement. It involves lymphocytic infiltration and destruction of exocrine glands (Sicca complex). * **Sarcoidosis:** Known as **Heerfordt’s Syndrome** (Uveoparotid fever) when it presents with parotid enlargement, uveitis, and facial nerve palsy. It is a common cause of bilateral parotid swelling due to non-caseating granulomas. * **Chronic Pancreatitis:** This falls under the category of **Sialadenosis** (Sialosis). Sialadenosis refers to non-inflammatory, non-neoplastic bilateral parotid swelling often associated with metabolic or systemic conditions, including chronic alcoholism, malnutrition, and chronic pancreatitis. **High-Yield Clinical Pearls for NEET-PG:** * **Sialadenosis (Bilateral Swelling):** Remember the "3 Ds": **D**rugs (Guanethidine), **D**iet (Malnutrition/Bulimia), and **D**iseases (Diabetes, Liver Cirrhosis, Pancreatitis). * **Warthin’s Tumor:** The most common **neoplastic** cause of bilateral parotid enlargement (though often metachronous). * **Mumps:** The most common **viral** cause of acute bilateral parotid swelling in children. * **Heerfordt’s Syndrome:** A pathognomonic presentation of Sarcoidosis involving the parotid gland.

Q: Which oral lesion is associated with ulcerative colitis?

Pyostomatitis Vegetans. **Explanation:** **Pyostomatitis Vegetans (PV)** is a rare but highly specific oral manifestation of **Inflammatory Bowel Disease (IBD)**, most commonly associated with **Ulcerative Colitis** (and occasionally Crohn’s disease). It is characterized by multiple small, friable, cream-colored pustules on an erythematous base, often described as having a **"snail-track" appearance**. These pustules eventually rupture to form vegetating erosions. The severity of the oral lesions often mirrors the activity of the intestinal disease. **Analysis of Incorrect Options:** * **Lichen Planus:** An inflammatory condition affecting the skin and mucous membranes (Wickham striae). While it can be associated with Hepatitis C, it has no direct link to Ulcerative Colitis. * **Sarcoidosis:** A multisystem granulomatous disease. Oral involvement typically presents as non-caseating granulomas or salivary gland enlargement (Heerfordt's syndrome), not PV. * **Dermatitis Herpetiformis:** This is the cutaneous manifestation of **Celiac Disease** (Gluten-sensitive enteropathy), not Ulcerative Colitis. It presents as pruritic vesicles on the elbows, knees, and buttocks. **High-Yield Clinical Pearls for NEET-PG:** * **"Snail-track" ulcers:** Pathognomonic clinical description for Pyostomatitis Vegetans. * **Histology:** Characterized by intraepithelial abscesses filled with **eosinophils** (eosinophilic microabscesses). * **Management:** Treatment of the underlying Ulcerative Colitis (e.g., Sulfasalazine or Corticosteroids) typically leads to the resolution of oral lesions. * **Other IBD associations:** Aphthous ulcers are common in both, but "cobblestoning" of the mucosa is more specific to Crohn’s disease.

Question 1

Reversible pulpitis changes to irreversible pulpitis primarily because of?

Accepted Answer

Invasion of microorganisms

Answer

Vascular strangulation

Answer

Reduced host resistance

Answer

An increase in microbial virulence

Question 2

Bilateral parotid enlargement is seen in:

Accepted Answer

All of the above

Answer

Wegener's granulomatosis

Answer

Sjögren's syndrome

Answer

Kimura's disease

Question 3

Which of the following is NOT a high-grade salivary gland malignancy?

Accepted Answer

Basal cell adenocarcinoma

Answer

Mucoepidermoid carcinoma

Answer

Adenoid cystic carcinoma

Answer

Salivary duct carcinoma

Question 4

A 17-year-old girl notices a small, sensitive, gray-white area forming along the lateral border of her tongue 2 days before the end of her final examinations. On examination, the girl is afebrile. There is a shallow, ulcerated, 0.3-cm lesion with an erythematous rim. No specific therapy is given, and the lesion disappears within 2 weeks. The history shows that the girl does not use tobacco or alcohol. Which of the following is the most probable diagnosis?

Accepted Answer

Aphthous ulcer

Answer

Herpes simplex stomatitis

Answer

Leukoplakia

Answer

Oral thrush

Question 5

What is the difference between nicotinic stomatitis and papillary hyperplasia?

Accepted Answer

A small centrally placed dot

Answer

Multiple dots at the periphery

Answer

Rings at the center

Answer

Rings at the periphery

Question 6

What is the most common cause of dry mouth in adults?

Accepted Answer

Antihistaminics

Answer

Tranquilizers

Answer

Insulin

Answer

Birth control pills

Question 7

The most common malignant tumor of the gingiva is:

Accepted Answer

Squamous cell carcinoma

Answer

Malignant melanoma

Answer

Sarcoma

Answer

Fibrosarcoma

Question 8

Bilateral parotid enlargement does not occur in which of the following conditions?

Accepted Answer

SLE

Answer

Sjogren's syndrome

Answer

Sarcoidosis

Answer

Chronic pancreatitis

Question 9

Which of the following is true about Odontogenic keratocyst?

Accepted Answer

Seen in the posterior mandible

Answer

Most common in females

Answer

Not premalignant

Answer

Treatment is observation

Question 10

Which oral lesion is associated with ulcerative colitis?

Accepted Answer

Pyostomatitis Vegetans

Answer

Lichen planus

Answer

Sarcoidosis

Answer

Dermatitis herpetiformis

Diseases of the Oral Cavity and Salivary Glands — MCQs

Diseases of the Oral Cavity and Salivary Glands — MCQs

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