Mottet, N. Karle University Hospital, University of Washington, Seattle, Washington.
Quaife, Carol Department of Pathology, University of Washington, Seattle, Washington.
Last reviewed:February 2019
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- Benign and malignant tumors
- Degree of harm
- Cancer staging and treatment
- Related Primary Literature
- Additional Reading
Any abnormal mass of cells resulting from excessive cellular multiplication. In its original context, the word tumor was used to describe any swelling of the body, regardless of the cause. At present, the word is used predominantly to refer to a neoplastic cellular mass (also termed a neoplasm). Tumors can be benign or malignant. When tumors are malignant, they are considered to be cancerous (Fig. 1). See also: Cancer; Cell (biology); Oncology
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