Tumours: masses of cells formed when cells grow and divide uncontrollably
Benign tumours are masses of cells that stay in one part of the body. They don’t invade tissues around them or spread to other parts of the body. Benign tumours are not cancers.
Malignant tumours are masses of cells that can invade tissues around them and spread to other parts of the body. Malignant tumours arecancers.
How can malignant tumours spread around the body to form secondary tumours?
Cells can break off from malignant tumours and enter the bloodstream, spreading them around the body- these cells can then form secondary tumours.
