What characteristic defines a malignant tumor?

A characteristic that defines a malignant tumor is its ability to invade and destroy local tissues, as well as its potential to spread to other parts of the body, a process known as metastasis. Malignant tumors can infiltrate surrounding tissues, leading to damage and disruption of normal functions. This behavior distinguishes them from benign tumors, which typically grow in a localized manner and do not invade nearby tissues or metastasize.

In contrast to this, a malignant tumor will show uncontrolled growth and can recur after being removed, further emphasizing its aggressive nature. This invasive characteristic is critical in diagnosing and determining the treatment approach for cancerous tumors, as the spread of malignant cells can lead to serious health complications. Understanding this behavior is essential for medical professionals when assessing tumor types and formulating patient management strategies.