Tumour

Repeated uncontrolled division can produce a mass of abnormal cells called a tumour. Many cancers form solid tumours, but this is not true of every cancer: blood cancers such as leukaemia are an exception.

Repeated uncontrolled division can produce a mass of cells called a tumour. Most tumours are solid, although cancers of the blood, such as leukaemia, are exceptions.

A changed cell grows and divides uncontrollably, producing more abnormal cells. These cells may accumulate into a mass called a tumour.

As the abnormal cells continue to divide, they can accumulate into a mass called a tumour. Tumours are not all the same. A benign tumour is non-cancerous and usually remains contained in one area.