Malignant and benign tumours
Benign tumours are cell growths whose genetic material is the same as the rest of the body. They are unable to infiltrate and destroy neighbouring tissue. Benign tumours do not form metastases. However, they can become dangerous if their growth puts pressure on vital organs or causes severe bleeding.
Malignant tumours are cell growths with altered genetic material. These cells are no longer controlled by the body, so they are characterised by unrestricted growth. As they grow, they infiltrate healthy tissue and destroy it. The cells of a malignant tumour can travel through the bloodstream to reach other parts of the body. There they can form metastases, which can destroy the surrounding tissue.