Tumor - Definition

March 2017


Definition


A tumor is a generic term defining a newly developed tissue within normal tissue. Tumors are caused by dysfunctional cellular development. As opposed to the commonly-held theory, the word "tumor" is not only used for cancerous diseases, but also for other tissue growths that are benign. Qualifying a tumor as malignant (cancerous) or benign (non cancerous) is possible on studying the tumor's aspect by means of medical imaging, but is often confirmed by biopsy, where a sample is taken for analysis. When a tumor is cancerous, it is called a primary tumor if found within an organ, or secondary if the abnormal growth originates from the circulation of tumorous cells.

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