What is the primary difference between a malignant tumor and a benign tumor?

• A. A benign tumor is more likely to cause symptoms than a malignant tumor.
• B. A benign tumor grows faster than a malignant tumor.
• C. A malignant tumor is always larger than a benign tumor.
• D. A malignant tumor can invade nearby tissues and spread to other parts of the body, while a benign tumor does not.

Answer: (D)

Verified step by step guidance

1. Understand the basic definitions: A tumor is an abnormal growth of cells. Tumors can be classified as benign or malignant based on their behavior and potential to cause harm.
2. Define a benign tumor: Benign tumors are non-cancerous growths. They tend to grow slowly and do not invade nearby tissues or spread to other parts of the body. They are usually encapsulated and can often be removed surgically.
3. Define a malignant tumor: Malignant tumors are cancerous. They have the ability to invade nearby tissues and spread to other parts of the body through a process called metastasis. This makes them more dangerous and harder to treat.
4. Compare the growth and spread: While benign tumors grow locally and remain confined to their original location, malignant tumors can grow aggressively and invade surrounding tissues, making them more likely to cause significant health issues.
5. Summarize the primary difference: The key distinction between benign and malignant tumors is the ability of malignant tumors to invade and metastasize, whereas benign tumors do not have this capability.