Free AGD Oral Pathology and Diagnosis Questions and Answers — Questions and Answers
Question 1: A 65-year-old male, a long-term heavy smoker, presents with a persistent, well-demarcated white patch on the lateral border of his tongue. The lesion is asymptomatic and cannot be wiped off with gauze. What is the most appropriate next step in management?
- Prescribe a topical antifungal medication and re-evaluate in two weeks.
- Advise the patient to cease smoking and observe the lesion for 3 months.
- Perform an incisional biopsy for definitive histopathologic diagnosis. (Correct answer)
- Recommend a chlorhexidine gluconate rinse to improve oral hygiene.
Correct answer: Perform an incisional biopsy for definitive histopathologic diagnosis.
The clinical presentation is highly suggestive of leukoplakia, which is a potentially malignant disorder. Given the patient's risk factors (age, smoking) and the high-risk location (lateral tongue), there is a significant concern for dysplasia or squamous cell carcinoma. Observation or empirical treatment for candidiasis is inappropriate. An incisional biopsy is the standard of care to obtain a definitive diagnosis and guide further treatment.
Question 2: Which of the following odontogenic cysts is most noted for its aggressive clinical behavior, high recurrence rate, and its association with Nevoid Basal Cell Carcinoma Syndrome (Gorlin-Goltz Syndrome)?
- Radicular (Periapical) Cyst
- Dentigerous Cyst
- Odontogenic Keratocyst (OKC) (Correct answer)
- Calcifying Odontogenic Cyst
Correct answer: Odontogenic Keratocyst (OKC)
The Odontogenic Keratocyst (OKC) is renowned for its high recurrence rate (up to 60%) due to its thin, friable epithelial lining and the presence of satellite microcysts. It is also a hallmark feature of Nevoid Basal Cell Carcinoma Syndrome, also known as Gorlin-Goltz syndrome.
Question 3: A panoramic radiograph of a 48-year-old asymptomatic African American female reveals multiple, bilateral, well-defined, mixed radiolucent/radiopaque lesions located in the periapical regions of the mandibular teeth. All associated teeth test vital. What is the most likely diagnosis?
- Chronic Diffuse Sclerosing Osteomyelitis
- Florid Cemento-Osseous Dysplasia (Correct answer)
- Multiple Periapical Granulomas
- Paget's Disease of Bone
Correct answer: Florid Cemento-Osseous Dysplasia
Florid Cemento-Osseous Dysplasia (FCOD) is a benign fibro-osseous condition that perfectly matches the described demographic (middle-aged African American females), location (mandible, multi-quadrant), and radiographic features (mixed density lesions at the apices of vital teeth). It is typically asymptomatic and requires no treatment, only periodic monitoring.
Question 4: A patient presents with painful, sloughing oral lesions. A biopsy is taken for direct immunofluorescence, which reveals IgG and C3 deposits in an intercellular, 'fishnet-like' pattern throughout the epithelium. This finding is pathognomonic for which of the following conditions?
- Bullous Pemphigoid
- Pemphigus Vulgaris (Correct answer)
- Erosive Lichen Planus
- Erythema Multiforme
Correct answer: Pemphigus Vulgaris
Pemphigus vulgaris is an autoimmune disease where autoantibodies target desmosomes, causing intraepithelial separation (acantholysis). This results in the characteristic intercellular deposition of IgG and C3, which appears as a 'fishnet' or 'chicken-wire' pattern on direct immunofluorescence. Bullous pemphigoid shows linear deposits at the basement membrane.
Question 5: A 35-year-old patient has a solitary, flat, blue-gray macule on the mandibular gingiva adjacent to a tooth with a large amalgam restoration. The lesion is asymptomatic and has been present for years without any change. What is the most likely diagnosis?
- Melanotic Macule
- Blue Nevus
- Amalgam Tattoo (Focal Argyrosis) (Correct answer)
- Malignant Melanoma
Correct answer: Amalgam Tattoo (Focal Argyrosis)
An amalgam tattoo is the most common pigmentation of the oral cavity. It results from the accidental implantation of amalgam particles into the soft tissue. The classic clinical presentation is a blue, gray, or black macule located on the gingiva or alveolar mucosa near a tooth with an amalgam filling. They are benign and typically require no treatment.
Question 6: Which of the following is the most common benign salivary gland tumor, typically presenting as a slow-growing, painless, mobile mass most often in the parotid gland?
- Warthin Tumor
- Mucoepidermoid Carcinoma
- Adenoid Cystic Carcinoma
- Pleomorphic Adenoma (Correct answer)
Correct answer: Pleomorphic Adenoma
Pleomorphic adenoma, also known as a benign mixed tumor, is the most common salivary gland neoplasm overall, accounting for up to 75% of all parotid tumors. It is characterized by its histologic diversity (pleomorphism) of epithelial and myoepithelial cells. Mucoepidermoid carcinoma and adenoid cystic carcinoma are malignant. Warthin tumor is the second most common benign tumor.
Free AGD Oral Pathology and Diagnosis Questions and Answers
A 65-year-old male, a long-term heavy smoker, presents with a persistent, well-demarcated white patch on the lateral border of his tongue.
The lesion is asymptomatic and cannot be wiped off with gauze.
What is the most appropriate next step in management?