Cancer

Metastasis is the spread of cancer from its primary site to other places in the body (e.g., brain, liver).

Cancer cells can break away from a primary tumor, penetrate into lymphatic and blood vessels, circulate through the bloodstream, and grow in a distant focus (metastasize) in normal tissues elsewhere in the body..



Tumor
Tumor (American English) or tumour (British English) originally means "swelling", and is sometimes still used with that meaning.


Tumor meaning swelling is one of the five classical characteristics of inflammation.
However, the term is now primarily used to denote abnormal growth of tissue.
This growth can be either malignant or benign..