Diseases of the Oral Cavity and Salivary Glands Practice Questions

Q: What is a constant feature associated with a radicular cyst?

A non-vital tooth. ### Explanation **Radicular Cyst (Periapical Cyst)** is the most common inflammatory odontogenic cyst of the jaws. It arises from the **epithelial rests of Malassez** in the periodontal ligament as a direct result of inflammation following the death of the dental pulp. #### Why "A Non-vital Tooth" is Correct: The pathogenesis of a radicular cyst begins with dental caries or trauma that leads to **pulpal necrosis (death of the tooth)**. Once the tooth becomes non-vital, bacterial toxins and inflammatory mediators exit the apical foramen into the periapical tissues. This chronic stimulus triggers the proliferation of the rests of Malassez, eventually forming a fluid-filled cyst at the root apex. Therefore, a **non-vital tooth** is a mandatory clinical prerequisite for a radicular cyst. #### Why Other Options are Incorrect: * **A. An impacted tooth:** This is a constant feature of a **Dentigerous cyst** (Follicular cyst), which attaches to the cemento-enamel junction of an unerupted tooth. * **B. A missing tooth:** A cyst found in place of a missing tooth (where it failed to develop) is typically a **Primordial cyst**. * **D. An anomalous tooth:** While anomalies can lead to decay, they are not a defining diagnostic feature of radicular cysts. #### NEET-PG High-Yield Pearls: * **Radiological Appearance:** Presents as a well-defined, unilocular radiolucency at the apex of a non-vital tooth with a distinct sclerotic border. * **Most Common Site:** Maxilla (specifically the anterior region). * **Treatment:** Root canal treatment (RCT) for small cysts; enucleation with apicoectomy for larger ones. * **Residual Cyst:** If the non-vital tooth is extracted but the cyst is left behind, it is then termed a "Residual Cyst."

Q: What is the most common site of sialolithiasis?

Submandibular gland. **Explanation:** The **submandibular gland** is the most common site for sialolithiasis, accounting for approximately **80–90%** of all salivary stones. This high incidence is attributed to several anatomical and physiological factors: 1. **Wharton’s Duct Anatomy:** The duct is long and follows an upward, tortuous course, leading to stasis of saliva against gravity. 2. **Saliva Composition:** Submandibular saliva is more **alkaline** (promoting calcium salt precipitation) and has a higher concentration of **calcium and phosphate** compared to parotid saliva. 3. **Mucin Content:** It contains a higher concentration of mucus, making the secretions more viscous. 4. **Punctum Size:** The orifice (opening) of Wharton’s duct is narrower than the duct itself, facilitating the entrapment of stones. **Analysis of Incorrect Options:** * **B. Parotid gland:** Accounts for only 10–15% of cases. Parotid saliva is serous (watery) and acidic, which keeps calcium salts in solution. Stensen’s duct is also wider and shorter. * **C. Sublingual gland:** Rarely involved (approx. 1–5%) because the gland has multiple small ducts (ducts of Rivinus) rather than one long, large-caliber duct. * **D. Equally common:** Incorrect, as the physical and chemical properties of saliva vary significantly between glands. **High-Yield Clinical Pearls for NEET-PG:** * **Radiopacity:** 80% of submandibular stones are **radiopaque** (visible on X-ray), whereas 80% of parotid stones are **radiolucent**. * **Best Imaging:** **Non-contrast CT (NCCT)** is the gold standard. For clinical screening, an **Intraoral Periapical (IOPA)** view or Occlusal view is used for submandibular stones. * **Clinical Presentation:** "Mealtime syndrome"—recurrent painful swelling of the gland triggered by the sight or smell of food. * **Management:** Small stones are managed with sialogogues; larger stones require surgical removal or Lithotripsy/Sialendoscopy.

Q: Multiple painful ulcers on the tongue are seen in all the following conditions EXCEPT?

Carcinomatous ulcers. **Explanation:** The key to answering this question lies in distinguishing between inflammatory/infective conditions and neoplastic conditions of the oral cavity. **1. Why Carcinomatous Ulcers are the Correct Answer:** Carcinomatous ulcers (Squamous Cell Carcinoma) are typically **painless** in their early stages. Pain only occurs in advanced stages when there is secondary infection or involvement of deep nerves (e.g., lingual nerve). Furthermore, malignancy usually presents as a **solitary**, indurated ulcer with everted edges, rather than multiple lesions. **2. Analysis of Incorrect Options:** * **Aphthous Ulcers:** These are the most common cause of painful oral ulcers. They are typically multiple, small, shallow, and extremely painful due to exposed nerve endings. * **Tuberculous Ulcers:** Secondary tuberculosis of the tongue presents as **multiple, severely painful** ulcers. They are characterized by an "undermined edge" and a pale, flabby base with granulations. The pain is often out of proportion to the size of the ulcer. * **Herpes Ulcers (Herpetic Stomatitis):** Caused by HSV-1, these present as multiple small vesicles that rupture to form clusters of painful, shallow ulcers. **Clinical Pearls for NEET-PG:** * **Tuberculous Ulcer:** Classically described as a "painful ulcer with an undermined edge" (High-yield). * **Carcinoma Tongue:** The most common site is the lateral border of the tongue. The most common histological type is Squamous Cell Carcinoma. * **Induration:** This is the hallmark of malignancy. If an ulcer feels firm/hard on palpation, suspect carcinoma. * **Vincent’s Angina:** Another cause of painful oral ulcers, characterized by a "punched-out" appearance and a pseudomembrane.

Q: White raised painless areas on peeling exhibit painful erythematous areas in case of?

Oral thrush. ### Explanation **Correct Answer: A. Oral thrush** **Why it is correct:** Oral thrush, or **Pseudomembranous Candidiasis**, is a fungal infection caused by *Candida albicans*. The classic clinical presentation is the presence of creamy white, curd-like patches (pseudomembranes) on the oral mucosa. The pathognomonic feature of this condition is that these white patches **can be scraped off** (peeled). Upon removal, they reveal a raw, **painful, erythematous (bleeding) base**. This distinguishes it from other white lesions of the oral cavity. **Why the other options are incorrect:** * **B. Pemphigus vulgaris:** This is an autoimmune blistering disease. It presents as fragile vesicles and bullae that rupture to leave behind painful, irregular erosions (Nikolsky sign positive). It does not typically present as a "peelable" white membrane. * **C. Leukoplakia:** Defined as a clinical white patch that cannot be characterized as any other disease. Crucially, leukoplakia **cannot be scraped off**. It is a premalignant condition associated with tobacco use. * **D. Erythroplakia:** This presents as a persistent fiery red velvety patch. It does not have a white raised component and is associated with a much higher risk of malignancy than leukoplakia. **Clinical Pearls for NEET-PG:** * **Scrapability Test:** If a white patch scrapes off and bleeds, think **Candidiasis**. If it does *not* scrape off, think **Leukoplakia** or **Lichen Planus**. * **Predisposing factors for Thrush:** Immunosuppression (HIV/AIDS), prolonged antibiotic use, inhaled corticosteroids (asthma), and uncontrolled Diabetes Mellitus. * **Diagnosis:** Confirmed by KOH mount showing pseudohyphae and budding yeast cells. * **Treatment:** Topical Nystatin or Clotrimazole; systemic Fluconazole for resistant cases.

Q: Which of the following statements regarding hard palate tumors is true?

Bilateral lymphatic spread occurs. **Explanation:** **1. Why Option C is Correct:** The hard palate is a midline structure with a rich, decussating lymphatic network. Lymphatic drainage from the hard palate primarily goes to the submandibular and upper deep cervical nodes. Because the palate lacks a midline anatomical barrier to lymph flow, tumors in this region frequently exhibit **bilateral or contralateral lymphatic spread**, even if the primary lesion appears unilateral. This necessitates careful evaluation of both sides of the neck during staging and treatment planning. **2. Why the Other Options are Incorrect:** * **Option A:** Smoking (along with alcohol and betel nut chewing) is a significant risk factor for squamous cell carcinoma of the hard palate. Additionally, "reverse smoking" (common in parts of India) is specifically associated with a high incidence of hard palate malignancies. * **Option B:** The most common **malignant** tumor of the hard palate is **Adenoid Cystic Carcinoma** (minor salivary gland origin), followed by Mucoepidermoid carcinoma. While Squamous Cell Carcinoma is common in the oral cavity, the hard palate is unique because of its high density of minor salivary glands. * **Option D:** Most hard palate tumors present as **painless, slow-growing swellings**. Pain is usually a late feature, often indicating perineural invasion (characteristic of Adenoid Cystic Carcinoma) or secondary infection. **Clinical Pearls for NEET-PG:** * **Reverse Smoking:** Strongly linked to hard palate cancer; presents with palatal keratosis. * **Adenoid Cystic Carcinoma:** Known for **perineural spread** and "skip lesions." It has a characteristic "Swiss cheese" appearance on histology. * **Pleomorphic Adenoma:** The most common **benign** tumor of the hard palate. * **Surgical Note:** Malignant tumors often require a maxillectomy; the resulting defect is managed with a prosthetic **obturator**.

Q: Which of the following statements regarding tumors of the hard palate is false?

Presents with pain. **Explanation:** Tumors of the hard palate, particularly squamous cell carcinomas, are notorious for being **painless** in their early and intermediate stages. Pain is a late feature, occurring only when there is deep infiltration into the palatine nerves or significant bone destruction. Therefore, "Presents with pain" is the false statement as it is not a characteristic early clinical feature. **Analysis of Options:** * **A. Slow growing:** Most hard palate malignancies (especially minor salivary gland tumors like Adenoid Cystic Carcinoma) are characterized by an indolent, slow-growing nature. * **B. Bilateral lymphatic spread:** The hard palate has a rich lymphatic network that crosses the midline. Because the primary site is central, tumors here frequently metastasize to the lymph nodes on both sides of the neck (Level I and II). * **C. Adenocarcinoma:** While Squamous Cell Carcinoma (SCC) is the most common primary malignancy of the oral cavity, the hard palate is unique because it contains a high density of minor salivary glands. Consequently, minor salivary gland tumors (like Adenoid Cystic Carcinoma and Mucoepidermoid Carcinoma) are very common here. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site for minor salivary gland tumors:** Hard palate. * **Most common benign tumor of the hard palate:** Pleomorphic adenoma. * **Most common malignant tumor of the hard palate:** Adenoid Cystic Carcinoma (though some texts cite SCC, minor salivary gland malignancies are disproportionately high here compared to other oral sites). * **Perineural invasion:** A hallmark of Adenoid Cystic Carcinoma, often leading to "skip lesions" along nerves.

Q: Reverse smoking is a known risk factor for which of the following conditions?

Carcinoma of the hard palate. **Explanation:** **Reverse smoking** is a unique form of tobacco use where the lit end of the cigarette or cheroot (locally known as *Chutta*) is placed inside the mouth. This practice is culturally prevalent in certain parts of India, particularly in the coastal regions of Andhra Pradesh and Odisha. **Why Carcinoma of the Hard Palate is the correct answer:** In reverse smoking, the oral cavity is subjected to extreme heat (pyrolysis) and high concentrations of combustion products. The **hard palate** bears the direct brunt of the intense heat and chemical carcinogens from the burning ember. This leads to a specific precancerous lesion known as **Palatal Keratosis**, which has a high rate of malignant transformation into **Squamous Cell Carcinoma of the hard palate**. While the hard palate is generally a rare site for oral cancer in the general population, it is the most common site in reverse smokers. **Analysis of Incorrect Options:** * **Carcinoma of the Lip:** Associated with conventional pipe smoking and chronic sun exposure (actinic cheilitis), but not specifically linked to the internal heat of reverse smoking. * **Carcinoma of the Soft Palate:** While the soft palate is exposed to smoke, it is not the primary site of contact for the lit end; the hard palate remains the anatomical "target" in this practice. * **Carcinoma of the Lung:** While all forms of smoking increase lung cancer risk, reverse smoking is primarily associated with localized **oral cavity** malignancies due to the direct thermal injury. **High-Yield NEET-PG Pearls:** * **Chutta:** The local name for the hand-rolled tobacco used in reverse smoking. * **Nicotina stomatitis:** A common finding in these patients, characterized by a "cobblestone" appearance of the palate with red dots (inflamed minor salivary gland ducts). * **Epidemiology:** Highest incidence is seen in females of the Vishakhapatnam district (Andhra Pradesh).

Q: Which of the following is the diagnosis of the condition shown?

Geographical tongue. ***Geographical tongue*** - Characterized by **map-like erythematous patches** with **white serpiginous borders** on the tongue dorsum, giving a geographical appearance. - Also known as **benign migratory glossitis**, as the lesions migrate and change pattern over time, typically asymptomatic. *Hairy tongue* - Features **elongated filiform papillae** that appear hair-like, often with brown or black discoloration. - Usually caused by **poor oral hygiene**, **smoking**, or certain medications, not the map-like pattern seen here. *Fissured tongue* - Presents with **deep grooves or fissures** running along the tongue surface, creating a wrinkled appearance. - Often **congenital** and associated with conditions like **Down syndrome** or **Melkersson-Rosenthal syndrome**. *Fordyce spots* - Small **yellowish-white papules** representing **ectopic sebaceous glands** typically found on lips or buccal mucosa. - Not associated with tongue lesions and appear as discrete spots rather than map-like patches.

Question 1

What is a constant feature associated with a radicular cyst?

Accepted Answer

A non-vital tooth

Answer

An impacted tooth

Answer

A missing tooth

Answer

An anomalous tooth

Question 2

What is the most common site of sialolithiasis?

Accepted Answer

Submandibular gland

Answer

Parotid gland

Answer

Sublingual gland

Answer

Equally common in all salivary glands

Question 3

Which of the following is untrue regarding Ludwig's angina?

Accepted Answer

Involves bilateral submandibular, sublingual, and submental spaces along with salivary gland enlargements.

Answer

Involves the submandibular, sublingual, and submental spaces.

Answer

Involves bilateral mandibular spaces and lymphadenopathy.

Answer

None of the above.

Question 4

Multiple painful ulcers on the tongue are seen in all the following conditions EXCEPT?

Accepted Answer

Carcinomatous ulcers

Answer

Aphthous ulcers

Answer

Tuberculous ulcers

Answer

Herpes ulcers

Question 5

A patient presents with bilateral diffuse swelling in the neck below the chin. Intraorally, the lower left molar is infected. Severe cellulitis in the submandibular, sublingual, and submental spaces may cause death due to which of the following?

Accepted Answer

Both severe sepsis and asphyxiation

Answer

Severe sepsis

Answer

Asphyxiation

Answer

Edema of the glottis

Question 6

White raised painless areas on peeling exhibit painful erythematous areas in case of?

Accepted Answer

Oral thrush

Answer

Pemphigus vulgaris

Answer

Leukoplakia

Answer

Erythroplakia

Question 7

Which of the following statements regarding hard palate tumors is true?

Accepted Answer

Bilateral lymphatic spread occurs

Answer

Smoking is not a risk factor

Answer

The most common tumor is adenocarcinoma

Answer

Tumors typically present as painful ulcers

Question 8

Which of the following statements regarding tumors of the hard palate is false?

Accepted Answer

Presents with pain

Answer

Slow growing

Answer

Bilateral lymphatic spread

Answer

Adenocarcinoma

Question 9

Reverse smoking is a known risk factor for which of the following conditions?

Accepted Answer

Carcinoma of the hard palate

Answer

Carcinoma of the lip

Answer

Carcinoma of the soft palate

Answer

Carcinoma of the lung

Question 10

Which of the following is the diagnosis of the condition shown?

Accepted Answer

Geographical tongue

Answer

Hairy tongue

Answer

Fissured tongue

Answer

Fordyce spots

Diseases of the Oral Cavity and Salivary Glands — MCQs

Diseases of the Oral Cavity and Salivary Glands — MCQs

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