What is one of the main characteristics of a benign tumor?

A main characteristic of a benign tumor is that it does not invade surrounding tissues. Benign tumors are typically well-defined masses that grow slowly and do not spread to other parts of the body. This property distinguishes them from malignant tumors, which are invasive and can infiltrate nearby tissues and metastasize to distant sites.

Unlike malignant tumors, benign tumors often remain localized and are often encapsulated, making them easier to remove surgically if necessary. While benign tumors may still cause issues due to their size or location by exerting pressure on adjacent structures, they lack the aggressive behavior characteristic of cancerous tumors, which can lead to the invasion and destruction of surrounding healthy tissues.

The other options highlight characteristics that are more aligned with malignant tumors or non-specific conditions. For example, rapid growth is typically associated with malignant tumors, and the potential for becoming cancerous is another distinguishing feature that does not apply to most benign tumors. Additionally, benign tumors may be asymptomatic, meaning they can exist without causing noticeable symptoms. This is contrary to the idea that they are always symptomatic. Therefore, the key defining trait noted in the correct option clearly distinguishes benign tumors in the context of tumor pathology.