Britannica
Sources used in this answer
How do benign tumors differ from malignant tumors?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
human disease
The routine monitoring of blood pressure levels is an important part of assessing an individual's health. Blood pressure provides information about the amount of blood in circulation and about heart function and thus is an important indicator of disease.
The primary distinction between benign and malignant tumors lies in their ability to invade surrounding tissues and spread to distant sites, a process known as metastasis.12
Key Differences
- Growth and Invasion: Benign tumors remain localized at their site of origin and are often enclosed by a connective tissue capsule, which allows them to push aside adjacent tissues without invading them. In contrast, malignant tumors are aggressive; they lack such capsules and typically invade and destroy surrounding healthy tissues.12
- Metastasis: The defining characteristic of malignancy is the capacity to metastasize, where tumor cells detach, enter the circulatory or lymphatic systems, and establish secondary tumors in distant organs. Benign tumors do not metastasize.123
- Cellular Characteristics: Malignant cells often appear undifferentiated or primitive, losing the specialized functions of their predecessor cells. Benign cells are often more similar in appearance to normal body cells.2
- Health Impact: While benign tumors are generally less dangerous, they can still cause disease or death if they grow large enough to compress vital structures, such as the brainstem. Malignant tumors are inherently more threatening because they are designed to spread and disrupt essential organ functions.123