Benign tumors and malignant tumors
Benign tumors- remain confined to their original location and do not spread to other parts of the body and cause little damage.
Malignant tumor cells grow very rapidly, invading and damaging the surrounding normal tissues of other organs.
Malignant tumors are lethal as cancer cells move from the tumor to new sites through the blood to form secondary tumors.
This invasion of cancer cells from one part to other parts by the body fluids is called metastasis.
