GENERAL KNOWLEDGE

Detailed explanation-1: -All benign tumours tend to remain localized at the site of origin. Many benign tumours are enclosed by a capsule consisting of connective tissue derived from the structures immediately surrounding the tumour. Well-encapsulated tumours are not anchored to their surrounding tissues.

Detailed explanation-2: -A benign tumor is well differentiated, grows slowly, shows expansile growth with encapsulation and does not metastasize. In contrast, a malignant tumor is often poorly differentiated, grows rapidly with many mitoses, shows invasive growth with no capsule and frequently metastasizes.

Detailed explanation-3: -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.