Example of mixed tumours is:
**Core Concept**
Mixed tumors are a type of neoplasm that contains both epithelial and mesenchymal components. This unique characteristic is a result of the tumor's ability to differentiate into multiple cell types. In the context of head and neck pathology, mixed tumors are a common finding.
**Why the Correct Answer is Right**
The correct answer is a type of head and neck tumor that is known for its biphasic composition of epithelial and mesenchymal elements. Specifically, the tumor cells are capable of undergoing squamous differentiation, while also exhibiting the features of myoepithelial cells. This dual differentiation is a hallmark of the tumor's mixed nature. The tumor's histological appearance typically shows a mixture of glandular, squamous, and spindle cell components.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe a mixed tumor. Instead, it refers to a type of tumor that is primarily composed of a single cell type.
**Option B:** This option is incorrect because it is a type of tumor that is characterized by its malignant potential, rather than its mixed composition.
**Option C:** This option is incorrect because it is a type of tumor that is primarily composed of glandular elements, but lacks the characteristic mesenchymal component of a mixed tumor.
**Clinical Pearl / High-Yield Fact**
Mixed tumors of the salivary glands are often found in the parotid gland, and can be distinguished from other types of tumors by their unique biphasic histological appearance. A key feature of these tumors is the presence of myoepithelial cells, which are a hallmark of their mixed nature.
**Correct Answer:** C. Pleomorphic adenoma