Diseases of the Oral Cavity and Salivary Glands Practice Questions

Q: What is the most likely diagnosis in a man with a 3-month history of migratory lesions on the tongue?

Geographic tongue. ### Explanation **Correct Answer: A. Geographic Tongue (Benign Migratory Glossitis)** The hallmark of **Geographic Tongue** is its dynamic and migratory nature. It is a benign inflammatory condition characterized by areas of dekeratinization (loss of filiform papillae) appearing as smooth, red patches with raised, white/yellowish circinate borders. The "migratory" history is the key clinical clue: the lesions heal in one area and reappear in another over days or weeks, changing the tongue's appearance like a shifting map. It is usually asymptomatic but may cause sensitivity to spicy foods. **Why the other options are incorrect:** * **B. Oral Candidiasis:** Presents as white, "curd-like" plaques that can be scraped off, leaving an erythematous base. It does not migrate and is often associated with immunosuppression or antibiotic use. * **C. Lichen Planus:** Typically presents as **Wickham’s striae** (reticular white lines) or erosive lesions. While chronic, these lesions are relatively stationary and do not shift locations rapidly across the tongue. * **D. Oral Hairy Leukoplakia:** Caused by the **Epstein-Barr Virus (EBV)** in HIV-positive patients. It presents as white, corrugated (hairy) patches on the **lateral borders** of the tongue that cannot be scraped off. It is not migratory. **High-Yield Clinical Pearls for NEET-PG:** * **Histology:** Shows "Munro’s microabscesses" (neutrophils in the stratum corneum), similar to psoriasis. * **Associations:** Often linked with fissured tongue and occasionally associated with HLA-B15. * **Management:** Reassurance is the mainstay. Topical steroids or zinc supplements may be used if symptomatic.

Q: Blockage along the course of a minor salivary duct, leading to pooling of saliva behind the obstruction and localized swelling, is known as:

Retention mucocele. **Explanation:** **1. Why Retention Mucocele is Correct:** A **Retention Mucocele** (Mucous Retention Cyst) occurs due to a partial or complete **obstruction** of a minor salivary gland duct (often by a sialolith or scar tissue). This leads to the pooling of saliva within the ductal system, causing it to dilate and form a swelling lined by **epithelium**. The key distinction here is the mechanism: it is a "retention" phenomenon behind an anatomical blockage. **2. Analysis of Incorrect Options:** * **Ranula:** This is a specific type of mucocele occurring in the **floor of the mouth**, usually arising from the sublingual gland. While it involves saliva pooling, the question specifically describes the general mechanism of minor salivary duct blockage. * **Mucous Extravasation Mucocele:** This is the most common type of mucocele. It is caused by **trauma** (e.g., lip biting) that ruptures the duct, causing saliva to leak into the surrounding stroma. Unlike the retention type, it lacks an epithelial lining (it is a pseudocyst). * **Sialolithiasis:** This refers to the formation of a stone (calculus) within the duct. While a stone can *cause* a retention mucocele, the resulting localized swelling of pooled saliva itself is defined as the mucocele. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most Common Site:** The **lower lip** is the most common site for mucoceles (usually extravasation type). * **Histology:** Retention mucoceles are **true cysts** (epithelial lining), whereas extravasation mucoceles are **pseudocysts** (granulation tissue lining). * **Plunging Ranula:** A clinical variant where the mucus extravasates below the mylohyoid muscle, presenting as a swelling in the neck. * **Treatment:** Surgical excision of the cyst along with the involved minor salivary gland to prevent recurrence.

Q: Which of the following is not an absolute contraindication for extraction of teeth?

Acute abscess with tooth. ### Explanation The correct answer is **D. Acute abscess with tooth**. In modern dental and ENT practice, an **acute abscess** is considered a **relative contraindication**, not an absolute one. While traditional teaching suggested waiting for the infection to localize, current clinical guidelines advocate for "surgical drainage through extraction." Removing the offending tooth provides an immediate pathway for pus to drain, removes the source of infection, and accelerates healing. If the patient is covered with systemic antibiotics and the site can be adequately anesthetized, extraction is often the treatment of choice. #### Analysis of Incorrect Options: * **A. Uncontrolled Diabetes:** This is an absolute contraindication because hyperglycemia impairs leukocyte function and wound healing. Extraction can lead to severe complications like **osteomyelitis** or life-threatening infections (e.g., Ludwig’s Angina). * **B. Uncontrolled Hypertension:** This is an absolute contraindication due to the risk of intraoperative cardiovascular events (stroke or MI) and the potential for prolonged, uncontrollable post-extraction hemorrhage. * **C. Leukemia:** This is an absolute contraindication because patients are severely immunocompromised and have profound thrombocytopenia. Extraction can lead to fatal septicemia or uncontrollable bleeding. #### High-Yield Clinical Pearls for NEET-PG: * **Absolute Contraindications:** Uncontrolled systemic diseases (Diabetes, HTN, Cardiac failure), Blood dyscrasias (Leukemia, Hemophilia), and recent Myocardial Infarction (within 6 months). * **Radiotherapy:** Avoid extraction in teeth within the field of radiation to prevent **Osteoradionecrosis**. * **Bisphosphonates:** Patients on IV bisphosphonates are at high risk for **MRONJ** (Medication-Related Osteonecrosis of the Jaw) following extraction.

Q: What is the recommended treatment for a calculus within the submandibular salivary gland?

Removal of the gland. ### Explanation The management of submandibular sialolithiasis (calculi) depends primarily on the **location** of the stone. **1. Why "Removal of the gland" is correct:** When a calculus is located **within the substance of the submandibular gland** (intrastructural/intraglandular), it causes chronic inflammation, recurrent infection, and eventual fibrosis of the glandular parenchyma. In such cases, simple removal of the stone is technically difficult and often fails to restore gland function. Therefore, **submandibular gland excision (Sialadenectomy)** is the definitive treatment of choice to prevent recurrent sialadenitis. **2. Analysis of Incorrect Options:** * **Removal of sinus:** This is irrelevant. While a chronic infection might lead to a cutaneous fistula or sinus, the primary pathology is the stone within the gland, necessitating gland removal. * **Dichotomy:** This is not a standard surgical term for salivary stone management. * **Milking of the stone:** This technique is only applicable for **small, distal stones** located near the punctum (opening) of Wharton’s duct. It is ineffective and potentially traumatic for stones located deep within the gland. **3. High-Yield Clinical Pearls for NEET-PG:** * **Wharton’s Duct:** The most common site for salivary calculi (80%) due to the alkaline pH, high calcium/mucin content, and the upward (antigravity) course of the duct. * **Radiopacity:** 80% of submandibular stones are radiopaque (visible on X-ray), whereas 80% of parotid stones are radiolucent. * **Clinical Presentation:** "Mealtime syndrome"—recurrent pain and swelling of the gland triggered by the sight or smell of food. * **Surgical Landmark:** During submandibular gland removal, the **marginal mandibular nerve** must be protected (it lies superficial to the gland). * **Intraductal Stones:** If the stone is in the duct (not the gland), the treatment is **Sialolithotomy** (incision over the duct).

Q: Lymphoid tissue is seen in which parotid tumor?

Warthin's tumor. **Explanation:** **Warthin’s Tumor (Papillary Cystadenoma Lymphomatosum)** is the correct answer because its hallmark histological feature is a **double layer of oncocytic epithelium** forming cystic spaces and papillary projections, situated within a dense **lymphoid stroma** often containing germinal centers. The presence of lymphoid tissue is explained by the tumor’s pathogenesis: it is believed to arise from salivary gland epithelium that becomes entrapped within intra-parotid or para-parotid lymph nodes during embryological development. **Analysis of Incorrect Options:** * **Pleomorphic Adenoma:** The most common salivary gland tumor. It is characterized by a "mixed" appearance of epithelial/myoepithelial cells and a mesenchymal-like stroma (myxoid, chondroid, or osteoid), but it lacks a primary lymphoid component. * **Mucoepidermoid Carcinoma:** The most common malignant salivary gland tumor. It consists of a mixture of mucus-secreting, epidermoid, and intermediate cells, but does not feature organized lymphoid tissue. * **Adenoid Cystic Carcinoma:** Known for its "Swiss-cheese" (cribriform) appearance and a high propensity for perineural invasion, rather than lymphoid stroma. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Warthin’s tumor occurs **exclusively in the parotid gland** (usually the tail). * **Demographics:** Strongly associated with **smoking** and most common in older males. * **Multiplicity:** It is the most common salivary tumor to be **bilateral** (10%) or multicentric. * **Hot Spot:** On Technetium-99m pertechnetate scan, Warthin’s tumor appears as a **"Hot tumor"** due to the high mitochondrial content of oncocytic cells.

Q: What is the most common precancerous lesion for oral malignancy?

Leukoplakia. **Explanation:** **Leukoplakia** is the most common precancerous (potentially malignant) lesion of the oral cavity. It is clinically defined as a white patch or plaque that cannot be characterized clinically or pathologically as any other disease and cannot be scraped off. The malignant transformation rate ranges from 1% to 5%, though certain types (like non-homogeneous or speckled leukoplakia) carry a much higher risk. Chronic irritation from tobacco (smoking/chewing) and alcohol are the primary etiological factors. **Analysis of Incorrect Options:** * **Chronic hypertrophic candidiasis:** While this is considered a "premalignant condition" with a significant risk of dysplasia, it is far less common than leukoplakia in the general population. * **Dental ulcers:** These are usually traumatic (due to sharp teeth or ill-fitting dentures). While a chronic non-healing ulcer must be biopsied to rule out malignancy, the ulcer itself is not a classic "precancerous lesion" unless it is a manifestation of an underlying malignancy. * **Atrophic glossitis:** This is a clinical finding (smooth tongue) often seen in nutritional deficiencies (Vitamin B12, Iron). While it is associated with the **Plummer-Vinson Syndrome** (which is a precancerous *condition*), it is not the most common lesion. **NEET-PG High-Yield Pearls:** * **Most common site for Leukoplakia:** Buccal mucosa and commissures. * **Highest risk of transformation:** Speckled leukoplakia (Erythroleukoplakia) has a higher risk than homogenous leukoplakia. * **Precancerous Lesion vs. Condition:** A *lesion* is a localized change (e.g., Leukoplakia, Erythroplakia), whereas a *condition* is a generalized state associated with increased risk (e.g., Oral Submucous Fibrosis, Lichen Planus). * **Erythroplakia:** Though less common than leukoplakia, it has the **highest malignant potential** among all oral lesions.

Q: Which of the following conditions is characterized by a "hot nodule"?

Adenolymphoma. **Explanation:** The concept of a "hot nodule" in salivary gland imaging refers to the increased uptake of **Technetium-99m (Tc-99m) pertechnetate** during a radionuclide scan. **1. Why Adenolymphoma is correct:** Adenolymphoma, also known as **Warthin’s tumor**, is unique because it contains a high density of oncocytes and lymphoid stroma. These cells possess an abundance of mitochondria and maintain the ability to concentrate pertechnetate but lack the mechanism to secrete it into the ductal system. This results in the "trapping" of the isotope, appearing as a "hot" (hyperactive) area on the scan. **2. Why other options are incorrect:** * **Mixed Parotid Tumor (Pleomorphic Adenoma):** This is the most common salivary gland tumor. It typically appears as a **"cold nodule"** because the tumor tissue replaces normal acinar cells and does not concentrate the isotope. * **Adenoid Cystic Carcinoma:** As a malignant neoplasm, it lacks the specialized oncocytes required to concentrate Tc-99m. Like most other salivary malignancies and benign tumors (except Warthin’s and Oncocytoma), it appears as a **"cold"** defect. **3. High-Yield Clinical Pearls for NEET-PG:** * **The "Hot Nodule" Duo:** Only two salivary tumors typically show increased uptake: **Warthin’s Tumor** and **Oncocytoma**. * **Warthin’s Tumor Profile:** It is most common in elderly males, strongly associated with smoking, and is the most common salivary tumor to present **bilaterally** (though often metachronous). * **Location:** It almost exclusively occurs in the **parotid gland** (specifically the lower pole/tail). * **Mnemonic:** "Warthin’s is **HOT** (Hot on scan), **OLD** (Elderly), **MEN** (Male predominance), and **SMOKES** (Smoking association)."

Q: A leafless fruit-laden tree or cherry-blossom appearance on a sialogram indicates which of the following?

Sjogren's syndrome. ### Explanation **Correct Answer: C. Sjogren's syndrome** **Why it is correct:** Sjogren’s syndrome is a chronic autoimmune disorder characterized by lymphocytic infiltration and destruction of the exocrine glands (salivary and lacrimal). On a sialogram, the characteristic **"leafless fruit-laden tree"** or **"cherry-blossom"** appearance occurs due to **punctate sialectasis**. This represents the collection of contrast material in small, globular dilated intralobular ducts. Because the peripheral ductal system is destroyed by the inflammatory process, the main ducts appear bare (leafless), while the globular collections of contrast resemble fruit or blossoms. **Why the other options are incorrect:** * **A & B (Mucoepidermoid and Acinar cell carcinoma):** Malignant tumors typically cause ductal displacement, irregular narrowing, or "puddling" of contrast due to tissue destruction and invasion, rather than uniform globular sialectasis. * **D (Pleomorphic adenoma):** As a benign, slow-growing tumor, it typically presents with a **"ball-in-hand"** appearance on a sialogram. The tumor acts as a mass that displaces and stretches the surrounding normal ducts without invading them. **NEET-PG High-Yield Pearls:** * **Sialogram Patterns:** * **Sjogren’s Syndrome:** Punctate sialectasis (Cherry-blossom/Snowstorm appearance). * **Pleomorphic Adenoma:** Ball-in-hand appearance. * **Sialadenitis (Chronic):** Sausage-string appearance (due to segments of stenosis and dilatation). * **Sjogren’s Clinical Triad:** Keratoconjunctivitis sicca (dry eyes), Xerostomia (dry mouth), and a connective tissue disease (most commonly Rheumatoid Arthritis). * **Diagnostic Gold Standard:** Minor salivary gland biopsy (Lip biopsy) showing lymphocytic aggregates (Focus score >1). * **Risk:** Patients with Sjogren’s have a 40x increased risk of developing **B-cell MALT Lymphoma**.

Question 1

What is the most likely diagnosis in a man with a 3-month history of migratory lesions on the tongue?

Accepted Answer

Geographic tongue

Answer

Oral candidiasis

Answer

Lichen planus

Answer

Oral hairy leukoplakia

Question 2

Which of the following is not a premalignant lesion or condition?

Accepted Answer

Chronic hypertrophic candidiasis

Answer

Oral submucosal fibrosis

Answer

Lichen planus

Answer

Leukoplakia

Question 3

Blockage along the course of a minor salivary duct, leading to pooling of saliva behind the obstruction and localized swelling, is known as:

Accepted Answer

Retention mucocele

Answer

Ranula

Answer

Mucous extravasation mucocele

Answer

Sialolithiasis

Question 4

Which of the following is not an absolute contraindication for extraction of teeth?

Accepted Answer

Acute abscess with tooth

Answer

Uncontrolled diabetes

Answer

Uncontrolled hypertension

Answer

Leukemia

Question 5

What is the recommended treatment for a calculus within the submandibular salivary gland?

Accepted Answer

Removal of the gland

Answer

Removal of sinus

Answer

Dichotomy

Answer

Milking of the stone

Question 6

During extraction of an upper first molar, the mesiobuccal root is missing and suspected to have been pushed into the maxillary sinus. To classify a chronic oral-antral communication, what time duration is acceptable?

Accepted Answer

14 days

Answer

7 days

Answer

21 days

Answer

28 days

Question 7

Lymphoid tissue is seen in which parotid tumor?

Accepted Answer

Warthin's tumor

Answer

Adenoid cystic carcinoma

Answer

Mucoepidermoid carcinoma

Answer

Pleomorphic adenoma

Question 8

What is the most common precancerous lesion for oral malignancy?

Accepted Answer

Leukoplakia

Answer

Chronic hypertrophic candidiasis

Answer

Dental ulcers

Answer

Atrophic glossitis

Question 9

Which of the following conditions is characterized by a "hot nodule"?

Accepted Answer

Adenolymphoma

Answer

Mixed parotid tumor

Answer

Adenoid cystic carcinoma

Answer

All of the above

Question 10

A leafless fruit-laden tree or cherry-blossom appearance on a sialogram indicates which of the following?

Accepted Answer

Sjogren's syndrome

Answer

Mucoepidermoid cell carcinoma

Answer

Acinar cell carcinoma

Answer

Pleomorphic adenoma

Diseases of the Oral Cavity and Salivary Glands — MCQs

Diseases of the Oral Cavity and Salivary Glands — MCQs

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