What histological feature opposes the characteristic of pleomorphic adenoma?

Pleomorphic adenoma is characterized by its diverse histological features, including a mixture of epithelial and mesenchymal components. The term "pleomorphic" describes the variability in cell types and structure that can be observed within the tumor. This diversity is a hallmark of pleomorphic adenomas, allowing them to demonstrate both glandular and stromal elements.

The correct answer highlights the aspect of cell population in pleomorphic adenomas. A heterogenous cell population indicates that there are multiple types of cells present, which fits the definition of pleomorphic adenoma. This variability is integral to its classification and understanding the tumor's biology and potential behavior.

In contrast, a feature that would oppose the characteristic of pleomorphic adenoma is a lack of cellular diversity. If a tumor lacked this heterogeneity, it would not align with the defining characteristics of pleomorphic adenoma. Thus, the presence of a heterogeneous cell population supports the diagnosis rather than opposes it.

The other options reflect features that may not align with the expected characteristics of pleomorphic adenoma. For instance, extensive scarring and being encapsulated are not defining traits of this tumor, while being encapsulated could be more characteristic of other types of tumors. The answer reinforces the principle that pleomorphic adenomas