INBDE (Integrated National Board Dental Examination) Practice Exam

Warthin's tumor is composed of what cells?

1. Squamous cells and myoepithelial cells

2. Oncocytes and lymphoid cells

3. Epithelial cells and plasma cells

4. Fibroblasts and epithelial cells

The correct answer is: Oncocytes and lymphoid cells

Warthin's tumor is a tumor of the salivary gland, specifically the parotid gland. It is characterized by the presence of oncocytic cells (cells with abundant granular eosinophilic cytoplasm) and lymphoid cells (such as lymphocytes and plasma cells). Option A is incorrect because squamous cells are not typically found in this type of tumor. Option C is also incorrect because while epithelial cells are present, they are not typically accompanied by plasma cells in this type of tumor. Option D is incorrect because fibroblasts are not typically seen in Warthin's tumor. It is important to note that while oncocytic cells and lymphoid cells are the most common cell types seen in Warthin's tumor, other cell types may also be present.