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Tumours, both malignant and benign, “present” (first become observable) as lumps or masses caused by the abnormal growth of cells. Many benign tumours are encased in a well-formed capsule. Malignant tumours, on the other hand, lack a true capsule and, even when limited to a specific location, invariably can be seen to have infiltrated surrounding tissues. The ability to invade adjacent tissues is a major characteristic that distinguishes malignant tumours from benign tumours. A tumour mass is composed not only of abnormal tumour cells but also of normal host cells, which nourish the tumour, and immune cells, which attempt to ...(100 of 21846 words)