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From Citizendium, the Citizens' Compendium

In today's use, a tumour normally refers to a Neoplasm. A 'non-neoplastic' tumour is technically known as a tumefaction, but is commonly called swelling.

Common forms of swelling (or non-Neoplastic tumefactions) are inflammations, edemas, cysts, hemorrhages and congenital malformations like nevus.