What typically characterizes the behavior of malignant tumors when compared to benign tumors?

The behavior of malignant tumors is primarily characterized by their ability to invade surrounding tissues and their potential to metastasize, which means they can spread to other parts of the body. This invasive growth allows malignant tumors to disrupt normal tissue function and architecture, as they not only grow uncontrollably but can also infiltrate adjacent healthy tissues, leading to further complications.

In contrast, benign tumors typically remain localized and do not invade surrounding tissues; they may grow, but their growth is often encapsulated, allowing them to be more easily removed and usually without the severe health risks associated with malignancy. Additionally, malignant tumors are classified as cancerous, whereas benign tumors are non-cancerous, indicating a crucial distinction in their impact on health.

The other statements do not accurately reflect the key differences between malignant and benign tumors, underscoring that the defining characteristic of malignant tumors is their invasive nature and ability to metastasize.